Orris

I need a PPT. Or... Pathology topic is... Smear in technique and staining of gastrointestinal tract, respiratory tract, urinary tract. I am studying in third BSc MLD under Rajiv Gandhi University of Health Science. So, I need a proper PPT of this topic.

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Searching the Web

smear technique staining gastrointestinal respiratory urinary tract cytology MLD pathology RGUHS

Reading File
Reading Web Page

https://pmc.ncbi.nlm.nih.gov/articles/PMC7121370

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smear technique preparation staining cytology gastrointestinal tract respiratory urinary BSc MLD laboratory

Reading Web Page

https://pmc.ncbi.nlm.nih.gov/articles/PMC3507055

Running Command

mkdir -p /home/daytona/workspace/smear-ppt && ls /home/daytona/workspace/smear-p…

Writing File

~/smear-ppt/create_smear_ppt.js

const pptxgen = require("pptxgenjs");
const pres = new pptxgen();

pres.layout = 'LAYOUT_16x9';
pres.title = 'Smear Technique and Staining – GI, Respiratory & Urinary Tracts';
pres.author = 'III BSc MLD – RGUHS';

// ── COLOUR PALETTE ──────────────────────────────────────────────────────────
const C = {
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  purple:   '7B1FA2',
  red:      'C62828',
  orange:   'E65100',
};

// ── HELPERS ──────────────────────────────────────────────────────────────────
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}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 1 – TITLE SLIDE
// ════════════════════════════════════════════════════════════════════════════
let s = pres.addSlide();
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// accent bar
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s.addText('SMEAR PREPARATION\n& STAINING TECHNIQUES', {
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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 2 – CONTENTS / OUTLINE
// ════════════════════════════════════════════════════════════════════════════
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const topics = [
  { num:'01', label:'Introduction to Cytology & Smear Technique', color:C.midBg },
  { num:'02', label:'Fixatives and Staining Methods', color:C.teal },
  { num:'03', label:'Gastrointestinal Tract – Smear & Staining', color:C.green },
  { num:'04', label:'Respiratory Tract – Smear & Staining', color:C.purple },
  { num:'05', label:'Urinary Tract – Smear & Staining', color:C.orange },
  { num:'06', label:'Comparison & Quality Control', color:C.red },
];
topics.forEach((t, i) => {
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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 3 – SECTION TITLE: Introduction to Cytology
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
sectionTitle(s, 'Introduction to Cytology', 'Definition | Scope | Types of Specimens');

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 4 – Introduction to Cytology
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'Introduction to Cytology', [
  '## What is Cytology?',
  'Branch of pathology studying individual cells or cell groups obtained from tissues/fluids to make a diagnosis',
  'First described by George Papanicolaou (1917–1928); widely adopted after 1943 for cervical cancer screening',
  '## Scope in MLD / Cytopathology',
  'Detection of malignancies, infections, inflammatory conditions and pre-neoplastic changes',
  '## Types of Cytology Specimens',
  'Exfoliative – cells shed naturally (sputum, urine, cervical smear)',
  'Aspiration – FNA or body fluid aspiration (pleural, peritoneal)',
  'Imprint / Scrape – direct touch or scrape from cut surface of tissue',
  'Brushing – endoscopic brushes from GI/respiratory mucosa',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 5 – Smear Preparation – General Principles
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'General Principles of Smear Preparation', [
  '## Slide Preparation',
  'Use clean, grease-free, labelled glass slides (frosted end for marking)',
  'Cells must be thinly and evenly spread – too thick obscures nuclear details, too thin causes cellular loss',
  '## Smearing Techniques',
  'Slide-over-slide (push technique) – for viscous material like sputum, FNA',
  'Line smear technique – for fluids (drop at one end, spreader at 30-45° angle)',
  'Centrifuge/cytospin – concentrates cells from dilute specimens (urine, BAL fluid)',
  'Membrane filter – older method; traps cells on polycarbonate filter paper',
  'Liquid-based cytology (LBC) – monolayer automated technique (ThinPrep, SurePath)',
  '## Important Rules',
  'Fix smears IMMEDIATELY after preparation to avoid drying artefact',
  'Never heat-fix smears intended for Pap stain – use wet (alcohol) fixation',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 6 – SECTION TITLE: Fixatives & Staining
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
sectionTitle(s, 'Fixatives & Staining Methods', 'Wet Fixation | Air Drying | Papanicolaou | MGG | H&E');

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 7 – Fixatives
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
twoColSlide(s,
  'Cytological Fixatives',
  'Wet (Alcohol) Fixation',
  [
    '95% Ethyl Alcohol – most common',
    'Carnoy\'s fixative (ethanol + acetic acid + chloroform) – for mucoid specimens',
    'Polyethylene glycol (Saccomanno\'s fixative) – for sputum collection',
    'CytoLyt, PreservCyt – liquid-based cytology fixatives',
    'Immediate fixation required – drop slide into jar within 2–3 seconds',
    'Preserves nuclear chromatin detail for Pap staining',
  ],
  'Air-Dried (No Fixation)',
  [
    'Slides allowed to air-dry at room temperature for 10–15 min',
    'Used prior to Romanowsky stains (MGG, Giemsa, Diff-Quik)',
    'Better for demonstrating cytoplasmic granules, mucin, extracellular material',
    'Suitable for FNA smears, bone marrow, sputum (alternative)',
    'Avoid in hot/humid conditions – may cause rapid drying artefact',
  ],
  C.midBg, C.teal
);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 8 – Papanicolaou Stain
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'Papanicolaou (Pap) Stain – Steps', [
  '## Principle',
  'Polychromatic stain highlighting nuclear detail; cells stained with Haematoxylin (nuclear) + OG-6 (keratin) + EA-36/50 (cytoplasmic)',
  '## Step-by-Step Procedure',
  'Step 1 – Fixation: Wet-fix smear in 95% ethanol for 15–30 min',
  'Step 2 – Rehydration: Pass through descending alcohol grades (100% → 95% → 70% → water)',
  'Step 3 – Nuclear staining: Harris Haematoxylin (5 min) → rinse in water',
  'Step 4 – Differentiation: 0.05% HCl in 70% ethanol (acid alcohol) until nuclei clear',
  'Step 5 – Bluing: Running tap water 5–10 min OR dilute ammonia water',
  'Step 6 – Cytoplasmic stain: OG-6 (2 min) → EA-36 or EA-50 (3–5 min)',
  'Step 7 – Dehydration: Ascending alcohols → 100% ethanol (2 changes)',
  'Step 8 – Clearing: Xylene (2 changes, 2 min each)',
  'Step 9 – Mounting: Dibutyl phthalate polystyrene xylene (DPX)',
  '## Results',
  'Nuclei – blue-black | Cytoplasm – pink/orange/green | Mucus – pale green',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 9 – MGG / Other Stains
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
twoColSlide(s,
  'Other Cytological Staining Methods',
  'May–Grünwald–Giemsa (MGG)',
  [
    'Used on air-dried smears',
    'Step 1: Cover slide with May-Grünwald solution (2 min)',
    'Step 2: Add equal volume buffer pH 6.8 (2 min)',
    'Step 3: Drain and apply Giemsa solution (diluted 1:10) for 15–20 min',
    'Step 4: Rinse in buffer, air-dry, mount',
    'Results: Nuclei – purple; cytoplasm – pink to lilac; RBCs – pink; mucus – pale blue',
    'Best for: FNA, sputum, body fluids',
  ],
  'H&E & Special Stains',
  [
    'Haematoxylin & Eosin (H&E): Used on cell block sections',
    'Nuclei – blue; cytoplasm – pink',
    'Ziehl-Neelsen (ZN) Stain: AFB organisms (Mycobacterium) – red rods',
    'PAS (Periodic Acid-Schiff): Fungi, glycogen, mucin – magenta',
    'Alcian Blue: Acid mucins – bright blue',
    'Mucicarmine: Mucin – red (detects Cryptococcus)',
    'Silver stains: Fungi (Pneumocystis), basement membranes',
  ],
  C.purple, C.green
);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 10 – SECTION TITLE: GI Tract
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
sectionTitle(s, 'Gastrointestinal Tract', 'Sample Collection | Smear Preparation | Staining | Normal & Abnormal Findings');

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 11 – GI Tract – Sample Collection
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'GI Tract – Specimen Collection Methods', [
  '## Types of Specimens',
  'Endoscopic brushing – most common; brush passed through endoscope to scrape mucosa',
  'Endoscopic FNA – fine needle aspiration under EUS guidance (submucosal/mural lesions)',
  'Imprint cytology – direct contact of biopsy tissue with slide',
  'Endoscopic washings – saline lavage collected during upper/lower GI endoscopy',
  'Stool specimens – occasionally used (Entamoeba histolytica, ova)',
  '## Clinical Indications',
  'Suspected oesophageal / gastric / colonic carcinoma',
  'Helicobacter pylori detection (brush + rapid urease test)',
  'Fungal infections (Candida), viral infections (CMV, HSV)',
  'Pre-neoplastic lesions – Barrett\'s oesophagus, dysplasia',
  '## Brushing Technique',
  'Brush vigorously over suspicious area 3–5 times → immediately smear onto 2 slides → fix one in 95% ethanol (Pap) + air-dry second (MGG)',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 12 – GI Tract – Smear Prep & Staining
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'GI Tract – Smear Preparation & Staining', [
  '## Smear Preparation',
  'Roll or stroke the brush gently along the slide in a continuous motion – do NOT press hard (crush artefact)',
  'Prepare at least 2 smears: one wet-fixed + one air-dried for complementary staining',
  'For washings: centrifuge at 1500 rpm × 5 min; discard supernatant; smear sediment',
  'For FNA material: express drop onto slide → spread with second slide at 30–45°',
  '## Recommended Stains for GI Cytology',
  'Papanicolaou stain – nuclear detail, dysplasia assessment, malignant cells',
  'MGG / Giemsa – Helicobacter pylori (curved bacilli, blue), inflammatory cells',
  'H&E (cell block) – glandular architecture, adenocarcinoma',
  'PAS ± diastase – mucin-secreting cells, Candida (red cell walls)',
  'Silver stain (Warthin-Starry or Gimenez) – H. pylori confirmation',
  'Alcian Blue + PAS – goblet cell metaplasia in Barrett\'s oesophagus',
  '## Normal GI Cytology Findings',
  'Regular columnar cells in orderly honeycomb sheets | goblet cells | no nuclear atypia',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 13 – SECTION TITLE: Respiratory Tract
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
sectionTitle(s, 'Respiratory Tract', 'Sputum | BAL | Bronchial Brushing | FNA | Staining');

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 14 – Respiratory – Specimen Types & Collection
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'Respiratory Tract – Specimen Types & Collection', [
  '## Types of Specimens',
  'Sputum – expectorated or induced (3 early-morning samples preferred for maximum yield)',
  'Bronchial washing – saline instilled and aspirated via bronchoscope',
  'Bronchoalveolar lavage (BAL) – 100–250 mL saline → washes alveolar compartment',
  'Bronchial brushing – cytology brush passed via bronchoscope over lesion',
  'Transbronchial / Percutaneous FNA – CT/EUS-guided; 19–22 gauge needle',
  'Pleural fluid – thoracocentesis (sent for cytology if malignancy suspected)',
  '## Sputum Collection Protocol',
  'Patient coughs deeply after physiotherapy / postural drainage',
  'Early morning (post-sleep) samples preferred – highest cell concentration',
  'Collect in wide-mouthed sterile container; process within 2–4 hours',
  'Mucolytic agent (N-acetylcysteine / Saccomanno\'s fixative) added if delayed processing',
  '## Saccomanno\'s Technique',
  'Equal volume 50% ethanol + 2% Carbowax added to sputum → homogenised → centrifuged → smear sediment → Pap stain',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 15 – Respiratory – Smear Prep & Staining
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'Respiratory Tract – Smear Preparation & Staining', [
  '## Smear Preparation',
  'Sputum: Select bloodstained/mucoid areas → place on slide → cover with second slide → pull apart in one smooth motion (slide-over-slide)',
  'BAL & washings: Centrifuge 1500 rpm × 10 min → prepare cytospin slides or direct smear from pellet',
  'FNA: Express small drop → spread at 30–45° → fix immediately (Pap) OR air-dry (MGG)',
  'Bloody specimens: Treat with 1% acetic acid to lyse RBCs before centrifugation',
  '## Staining Methods',
  'Papanicolaou – gold standard for respiratory cytology; nuclei blue-black; cytoplasm polychromatic',
  'MGG (Romanowsky) – air-dried smears; best for inflammatory cells, FNA direct smears',
  'H&E – cell block sections from pellet',
  'ZN stain – AFB in TB/MAI specimens (red beaded rods on blue background)',
  'PAS / Silver (GMS) – Pneumocystis jirovecii (cysts), fungal elements',
  '## Normal Respiratory Cytology',
  'Ciliated columnar cells | goblet cells | alveolar macrophages (smokers: anthracotic pigment) | squamous metaplastic cells',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 16 – SECTION TITLE: Urinary Tract
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
sectionTitle(s, 'Urinary Tract', 'Urine Cytology | Bladder Washing | FNA | Staining');

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 17 – Urinary – Specimen Types & Collection
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'Urinary Tract – Specimen Types & Collection', [
  '## Types of Specimens',
  'Voided urine (VU) – spontaneously passed; 50–100 mL midstream sample',
  'Catheterised urine – via indwelling or in-out catheter; higher cellular yield',
  'Bladder washing (barbotage) – 50 mL saline instilled and aspirated via cystoscope; best cellularity',
  'Ureteral brushing – brush advanced via ureteroscope; for upper tract lesions',
  'Renal pelvis FNA – CT-guided; for solid renal pelvis masses',
  '## Collection Protocol',
  'Second morning voided specimen preferred (first voiding has degenerated cells)',
  'Collect fresh; process within 1–2 hours OR fix immediately in equal volume 50% ethanol',
  'Avoid very dilute first-void samples – low cellular yield',
  '## Processing',
  'Centrifuge at 1500–2000 rpm × 10 min → discard most supernatant → resuspend pellet',
  'Prepare cytospin preparations (best cellular morphology) OR direct smears',
  'Liquid-based cytology (ThinPrep) now standard in many laboratories',
]);

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 18 – Urinary – Smear Prep & Staining
// ════════════════════════════════════════════════════════════════════════════
s = pres.addSlide();
contentSlide(s, 'Urinary Tract – Smear Preparation & Staining', [
  '## Smear Preparation',
  'Cytospin: Load 200–400 µL of resuspended sediment into cytospin funnel → spin at 1000 rpm × 5 min → air-dry or wet-fix',
  'Direct smear: Place 1–2 drops of sediment on labelled slide → spread with pipette tip → fix or air-dry',
  'For bloody urine: Add equal volume 1% acetic acid → mix → centrifuge → smear pellet',
  '## Staining Methods',
  'Papanicolaou – standard for urothelial cytology; nuclear detail for grading atypia',
  'H&E – cell block, tissue fragments, histological assessment',
  'MGG / Diff-Quik – air-dried slides; cellular overview, inflammatory cells',
  '## Paris System for Reporting Urine Cytology (2022)',
  'Non-diagnostic | Negative for HGUC | Atypical urothelial cells (AUC) | Suspicious for HGUC | HGUC',
  '## Normal Urinary Cytology',
  'Urothelial (transitional) cells – umbrella cells, intermediate cells, basal cells',
  'Squamous cells (from distal urethra), renal tubular cells (if catheterised)',
  'WBCs (<5/HPF normal), RBCs absent in health',
]);

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  ['Smear technique', 'Roll brush; cytospin for washings', 'Slide-over-slide (sputum); cytospin (BAL)', 'Cytospin; direct smear'],
  ['Primary fixation', 'Wet (95% EtOH) for Pap', 'Wet + air-dried (dual preparation)', 'Wet (95% EtOH) or LBC'],
  ['Main stain', 'Pap; Giemsa (H. pylori)', 'Pap (gold standard); MGG', 'Papanicolaou'],
  ['Special stains', 'PAS, Alcian Blue, WS silver', 'ZN, GMS, PAS', 'H&E (cell block); Diff-Quik'],
  ['Key normal cells', 'Columnar, goblet cells', 'Ciliated columnar, macrophages', 'Urothelial (umbrella) cells'],
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  'Reporting with standardised terminology (Bethesda / Paris System / Saccomanno classification)',
  '## Storage',
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  'GI: Endoscopic brushing → dual smears → Pap for malignancy; Giemsa for H. pylori',
  'Respiratory: Pap is gold standard; MGG complements; ZN/GMS for organisms',
  'Urinary: Cytospin gives best results; report using Paris System 2022',
  'Liquid-based cytology is replacing conventional smears in modern labs',
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// ════════════════════════════════════════════════════════════════════════════
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Smear Preparation and Staining RGUHS

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The presentation uses a deep navy + sky blue + amber colour palette and is divided into 6 sections:
#SlidesContent
Intro1–5Title slide, Contents, Introduction to cytology (definition, scope, types of specimens), General smear preparation principles (all techniques)
Fixatives & Staining6–9Section header, Wet vs air-dried fixation (two-column), Pap stain step-by-step procedure + results, MGG + H&E + special stains
GI Tract10–12Section header, Specimen collection (brushing, FNA, imprint, washings), Smear prep + staining (Pap, Giemsa for H. pylori, PAS, Alcian Blue)
Respiratory Tract13–15Section header, Specimen types (sputum, BAL, bronchial brushing, FNA), Smear prep + staining (Pap gold standard, ZN for TB, GMS for PCP)
Urinary Tract16–18Section header, Specimen types (voided urine, catheter, bladder washing), Cytospin technique + Pap stain + Paris System 2022 reporting
Comparison & QC19–22Side-by-side comparison table (all 3 tracts), Quality control (causes of bad smears + QC measures), Key Takeaways, Thank You

Key academic points covered (relevant to RGUHS III BSc MLD):

  • Slide-over-slide, line smear, cytospin, and LBC (ThinPrep) techniques
  • Wet fixation (95% ethanol) vs air-drying – why it matters for each stain
  • Full Papanicolaou stain procedure (all 9 steps including dehydration/clearing/mounting)
  • MGG procedure for air-dried smears
  • Special stains: ZN, PAS, Alcian Blue, GMS, Mucicarmine, Warthin-Starry
  • Saccomanno technique for sputum
  • Paris System 2022 categories for urine reporting
  • Normal cytological findings for all three tracts
  • Quality control – artefacts and preventive measures

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SLIDE 1 — Title

SMEAR PREPARATION & STAINING TECHNIQUES Gastrointestinal Tract | Respiratory Tract | Urinary Tract III BSc Medical Laboratory Technology Rajiv Gandhi University of Health Sciences Subject: Pathology (Cytopathology)

SLIDE 2 — Contents

  1. Introduction to Cytology & Smear Techniques
  2. Fixatives and Staining Methods
  3. Gastrointestinal Tract
  4. Respiratory Tract
  5. Urinary Tract
  6. Comparison & Quality Control

SLIDE 3 — Section Header

INTRODUCTION TO CYTOLOGY Definition | Scope | Types of Specimens

SLIDE 4 — Introduction to Cytology

What is Cytology?
  • Branch of pathology studying individual cells/cell groups from tissues or body fluids to establish a diagnosis
  • Pioneered by George Papanicolaou (1917–1928); formally adopted in 1943 for cervical cancer screening
Scope in Clinical MLT Practice
  • Detection of malignancies, pre-neoplastic changes, infections (bacterial, fungal, viral, parasitic) and inflammatory conditions
Types of Cytology Specimens
  • Exfoliative cytology – cells shed naturally (sputum, urine, cervical smear, endoscopic brushings)
  • Aspiration cytology – FNA or body fluid aspiration (pleural, peritoneal fluid)
  • Imprint / Touch cytology – direct contact of freshly cut tissue with glass slide
  • Scrape cytology – blade or spatula scrape from mucosal surface
Advantages over Histology
  • Minimally invasive | Rapid result | Repeatable | Low cost

SLIDE 5 — General Principles of Smear Preparation

Slide Requirements
  • Clean, grease-free, pre-labelled glass slides with frosted end for marking
  • Smears must be thin and even — overcrowded = poor nuclear detail; under-spread = cellular loss
Key Smearing Techniques
  • Push (slide-over-slide) technique – second slide at 30–45° pulls material across; for sputum, FNA
  • Line smear technique – drop at frosted end; spreader drawn in one smooth movement; for fluids
  • Cytospin (cytocentrifuge) – concentrates sparse cells from large fluid volumes (urine, BAL, CSF)
  • Membrane filter technique – polycarbonate filter traps cells; becoming obsolete
  • Liquid-based cytology (LBC) – ThinPrep/SurePath; monolayer; automated; background-free
Critical Rule
  • Fix smears IMMEDIATELY after spreading — delay causes air-drying artefact
  • Never heat-fix slides meant for Papanicolaou staining

SLIDE 6 — Section Header

FIXATIVES & STAINING METHODS Wet Fixation | Air Drying | Pap | MGG | H&E | Special Stains

SLIDE 7 — Cytological Fixatives (Two columns)

Wet (Alcohol) Fixation
  • 95% Ethyl Alcohol – most common; drop slide into Coplin jar immediately
  • Carnoy's fixative (EtOH + acetic acid + chloroform) – mucoid/bloody specimens
  • Saccomanno fixative (50% EtOH + 2% Carbowax) – sputum preservation
  • CytoLyt / PreservCyt – liquid-based cytology media
  • Preserves nuclear chromatin detail; ideal for Pap stain
  • Fix within 2–3 seconds of spreading to avoid drying artefact
Air-Dried (No Fixation)
  • Allow to dry at room temperature 10–15 min
  • Used before Romanowsky stains (MGG, Giemsa, Diff-Quik)
  • Better for cytoplasmic granules, mucin, extracellular matrix
  • Good for FNA smears, bone marrow, lymph node aspirates
  • Faster preparation — useful in rapid on-site evaluation (ROSE)
  • Avoid in hot/humid conditions — may cause premature artefact

SLIDE 8 — Papanicolaou (Pap) Stain

Principle
  • Polychromatic stain; Haematoxylin (nuclear) + OG-6 (keratin) + EA-36/50 (cytoplasmic)
Step-by-Step Procedure
  1. Fixation: Wet-fix in 95% ethanol for minimum 15–30 min
  2. Rehydration: 100% → 95% → 70% → distilled water (2 min each)
  3. Nuclear staining: Harris Haematoxylin 5 min → rinse in water
  4. Differentiation: 0.05% HCl in 70% ethanol until nuclei crisp and clear
  5. Bluing: Running tap water 5–10 min OR dilute ammonia water
  6. Cytoplasmic staining: OG-6 (2 min) → EA-36 or EA-50 (3–5 min)
  7. Dehydration: Ascending alcohols (70% → 95% → 100%, 2 changes)
  8. Clearing: Xylene (2 changes, 2 min each)
  9. Mounting: DPX mountant; apply coverslip carefully
Results
  • Nuclei – blue-black | Mature squamous cytoplasm – orange | Other cytoplasm – pink/green | Mucus – pale green

SLIDE 9 — Other Staining Methods (Two columns)

May-Grünwald-Giemsa (MGG)
  • Applied to air-dried smears only
  • Step 1: May-Grünwald stain undiluted, 2 min
  • Step 2: Equal volume phosphate buffer pH 6.8, 2 min
  • Step 3: Giemsa (1:10 in buffer) 15–20 min
  • Step 4: Rinse in buffer → air-dry → mount
  • Results: Nuclei – purple; cytoplasm – pink-lilac; RBCs – pink
  • Use: FNA direct smears, sputum, body fluids
H&E & Special Stains
  • H&E – cell block sections; nuclei blue, cytoplasm pink
  • ZN (Ziehl-Neelsen) – AFB (TB); acid-fast rods – red on blue
  • PAS – Fungi, mucin, glycogen – magenta
  • Alcian Blue – acid mucins – bright blue; goblet cells
  • Mucicarmine – mucin red; detects Cryptococcus capsule
  • GMS (Grocott Silver) – fungal walls, Pneumocystis cysts – black
  • Diff-Quik – rapid 3-step Romanowsky; ROSE / rapid diagnosis

SLIDE 10 — Section Header

GASTROINTESTINAL TRACT Sample Collection | Smear Preparation | Staining | Normal & Abnormal Findings

SLIDE 11 — GI Tract – Specimen Collection

Types of Specimens
  • Endoscopic brushing – most common; brush via endoscope scrapes mucosal surface
  • Endoscopic FNA (EUS-guided) – for submucosal/mural/lymph node lesions
  • Touch imprint cytology – freshly cut endoscopic biopsy tissue pressed on slide
  • Endoscopic washings – saline lavage during upper/lower GI endoscopy
  • Stool examination – Entamoeba histolytica trophozoites/cysts; ova and parasites
Clinical Indications
  • Suspected oesophageal/gastric/colonic carcinoma
  • Helicobacter pylori detection (Giemsa-stained brushing)
  • Candida/CMV/HSV infection in immunocompromised patients
  • Barrett's oesophagus (goblet cell metaplasia) and dysplasia surveillance
Brushing Technique
  • Vigorously brush suspicious area 3–5 passes → roll brush onto 2 slides
  • Smear 1 – wet-fix immediately in 95% ethanol (for Pap)
  • Smear 2 – air-dry (for Giemsa/MGG)

SLIDE 12 — GI Tract – Smear Preparation & Staining

Smear Preparation
  • Brush: Roll or stroke in continuous motion — do NOT press (crush artefact)
  • Washings: Centrifuge 1500 rpm × 5 min → discard supernatant → smear pellet
  • FNA: Drop aspirate on slide → spread with second slide at 30–45° angle
Staining Methods
  • Papanicolaou – nuclear detail; malignancy assessment; dysplasia grading
  • Modified Giemsa (MGG) – H. pylori (curved blue bacilli on surface of columnar cells)
  • H&E (cell block) – glandular architecture; signet-ring cell adenocarcinoma
  • PAS ± diastase – mucin-secreting cells; Candida (red cell walls on PAS)
  • Warthin-Starry/Gimenez silver – H. pylori confirmation
  • Alcian Blue + PAS – goblet cells in Barrett's oesophagus
Normal GI Cytology Findings
  • Regular tall columnar epithelial cells in honeycomb sheets
  • Goblet cells with intracytoplasmic mucin vacuoles
  • Smooth nuclear borders; inconspicuous nucleoli; no atypia
Abnormal/Malignant Features
  • Nuclear enlargement, hyperchromatism, irregular nuclear membrane, high N:C ratio, prominent nucleoli

SLIDE 13 — Section Header

RESPIRATORY TRACT Sputum | BAL | Bronchial Brushing | FNA | Pleural Fluid

SLIDE 14 — Respiratory Tract – Specimen Types & Collection

Types of Specimens
  • Expectorated sputum – most non-invasive; 3 early-morning samples maximise yield
  • Induced sputum – after saline nebulisation (5% hypertonic NaCl)
  • Bronchial washing – saline instilled and aspirated via bronchoscope
  • Bronchoalveolar lavage (BAL) – 100–250 mL saline; samples alveolar compartment
  • Bronchial brushing – cytology brush via bronchoscope over lesion
  • Transbronchial/percutaneous CT-guided FNA – 19–22 gauge needle
  • Pleural fluid – thoracocentesis; sent if malignancy suspected
Sputum Collection Protocol
  • Deep cough after physiotherapy; early-morning specimen post-sleep
  • Wide-mouthed sterile container; process within 2–4 hours
  • Mucolytic agents (N-acetylcysteine) if processing is delayed
Saccomanno Technique (Sputum Preservation)
  • Add equal volume Saccomanno fixative (50% ethanol + 2% Carbowax) to sputum
  • Homogenise in blender → centrifuge → smear sediment → stain with Pap

SLIDE 15 — Respiratory Tract – Smear Preparation & Staining

Smear Preparation
  • Sputum: Select purulent/blood-stained/mucoid areas; slide-over-slide technique
  • BAL/washings: Centrifuge 1500 rpm × 10 min; cytospin prep OR smear from pellet
  • FNA: Small drop → spread at 30–45°; fix one (Pap) + air-dry second (MGG)
  • Bloody specimens: Treat with 1% acetic acid to lyse RBCs before centrifugation
Staining Methods
  • Papanicolaou – gold standard; nuclei blue-black; cytoplasm polychromatic
  • MGG/Diff-Quik – air-dried FNA smears; inflammatory cells; rapid screening
  • H&E – cell block sections; tissue architecture
  • Ziehl-Neelsen (ZN) – Mycobacterium AFB; red beaded rods on pale blue background
  • GMS/PAS silver stain – Pneumocystis jirovecii cysts (GMS: black; PAS: red)
  • Mucicarmine/India ink – Cryptococcus capsule
Normal Respiratory Cytology
  • Ciliated columnar cells; goblet cells; alveolar macrophages (smoker: anthracotic pigment)
  • Squamous metaplastic cells (from large airways); no atypia

SLIDE 16 — Section Header

URINARY TRACT Voided Urine | Bladder Washing | Brushing | FNA | Staining

SLIDE 17 — Urinary Tract – Specimen Types & Collection

Types of Specimens
  • Voided urine (VU) – spontaneously passed; 50–100 mL midstream; non-invasive
  • Catheterised urine – via in-out or indwelling catheter; higher cellular yield
  • Bladder washing (barbotage) – 50 mL saline via cystoscope and aspirated; best cellularity
  • Ureteral brushing – brush via ureteroscope; upper tract lesions
  • Renal pelvis/renal mass FNA – CT-guided; for upper tract/renal mass
Collection Protocol
  • Second morning voided specimen preferred (1st void has degenerated cells)
  • Fresh sample; process within 1–2 hours OR fix immediately in equal volume 50% ethanol
  • Avoid very dilute specimens – low cell yield
Processing Steps
  • Centrifuge at 1500–2000 rpm × 10 min → discard supernatant → resuspend pellet
  • Cytospin preparations – best nuclear morphology preservation
  • Direct smear from pellet acceptable; LBC (ThinPrep) now standard in modern labs

SLIDE 18 — Urinary Tract – Smear Preparation & Staining

Smear Preparation
  • Cytospin: Load 200–400 µL resuspended sediment into funnel; 1000 rpm × 5 min; wet-fix or air-dry
  • Direct smear: 1–2 drops of resuspended pellet on slide; spread with pipette tip
  • Bloody urine: Add equal volume 1% acetic acid → mix → centrifuge → smear
Staining Methods
  • Papanicolaou stain – standard for urothelial cytology; nuclear atypia for grading
  • H&E – cell block sections; tissue architecture
  • MGG/Diff-Quik – air-dried; overview of cellular content, inflammatory cells
Paris System for Urine Cytology Reporting (2022)
  • Non-diagnostic
  • Negative for High-Grade Urothelial Carcinoma (NHGUC)
  • Atypical Urothelial Cells (AUC)
  • Suspicious for HGUC
  • High-Grade Urothelial Carcinoma (HGUC)
Normal Urinary Cytology
  • Umbrella cells (large superficial urothelial cells with binucleation)
  • Intermediate and basal urothelial cells; squamous cells (distal urethra)
  • WBC <5/HPF; RBCs absent; columnar cells if upper tract sampling

SLIDE 19 — Comparison Table

FeatureGastrointestinalRespiratoryUrinary
Primary SpecimenEndoscopic brushing/FNASputum, BAL, bronchial brushingVoided urine/bladder washing
Smear TechniqueRoll brush; cytospin for washingsSlide-over-slide (sputum); cytospin (BAL)Cytospin; direct smear from pellet
FixationWet (95% EtOH) + air-dry (MGG)Wet + air-dried dual preparationWet (95% EtOH) or LBC
Primary StainPap + Giemsa (H. pylori)Papanicolaou (gold standard); MGGPapanicolaou
Special StainsPAS, Alcian Blue, W-S silverZN (AFB), GMS/PAS (fungi, PCP)H&E cell block; Diff-Quik
Normal CellsColumnar epithelial; goblet cellsCiliated columnar; alveolar macrophagesUrothelial (umbrella, intermediate)
Key MalignancyAdenocarcinoma; SCC (oesophagus)SCC, adenocarcinoma, SCLCHigh-grade urothelial carcinoma

SLIDE 20 — Quality Control

Common Causes of Unsatisfactory Smears
  • Thick smears – cells overlap; nuclear detail obscured
  • Air-drying artefact – cytoplasm over-eosinophilic; nuclear detail lost (Pap stain)
  • Excess blood – RBCs mask diagnostic cells; treat with 1% acetic acid
  • Crush artefact – excessive pressure during brush rolling or spreading
  • Delayed fixation – autolytic degeneration; vacuolated nuclei
  • Under/over staining – incorrect timing or exhausted stain solution
QC Measures
  • Run positive and negative control slides with each staining batch
  • Regularly filter and replenish Pap staining solutions
  • Proper slide labelling – patient ID, date, specimen site, fixation method
  • Use standardised reporting terminology (Bethesda, Paris, Saccomanno systems)
Storage of Stained Slides
  • DPX-mounted slides – indefinitely at room temperature, away from direct light
  • Unstained wet-fixed smears – store in sealed jar with fresh 95% ethanol; label clearly

SLIDE 21 — Key Takeaways

  1. Smear preparation quality is the foundation of accurate cytological diagnosis
  2. Choose fixation first – wet/alcohol for Pap stain; air-dry for Romanowsky stains (MGG)
  3. GI Tract: Endoscopic brushing → dual smears → Pap (malignancy) + Giemsa (H. pylori)
  4. Respiratory: Pap is gold standard; ZN/GMS added for infections; Saccomanno for sputum
  5. Urinary: Cytospin gives best morphology; report using Paris System 2022
  6. Liquid-based cytology (LBC) is replacing conventional smears in modern laboratories
  7. Quality control – control slides, proper labelling, standardised reporting are mandatory

SLIDE 22 — Thank You

THANK YOU For Questions & Discussions III BSc Medical Laboratory Technology Rajiv Gandhi University of Health Sciences Subject: Pathology – Cytopathology
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