⭐ MOST IMPORTANT QUESTIONS (Repeated 3+ Times)

Long Essays / Short Essays - High Priority

⭐⭐ FREQUENTLY REPEATED SHORT ESSAYS / SHORT ANSWERS

📌 HISTOPATHOLOGY TECHNIQUE TOPICS (Important for MLT Students)

• Microtome (types, parts, honing & stropping) - Jul 2022, Oct 2019
• Tissue Processing (automatic / steps) - Jul 2022, Oct 2019
• Fixatives (ideal properties, alcoholic fixatives) - Jul 2022, Dec 2022
• Embedding (media, procedure) - Jul 2022, Oct 2019, Dec 2022
• Mounting media - Jul 2022, Dec 2022
• Dehydrating agents - Dec 2022, Oct 2019

🔥 TOP 10 MUST-PREPARE TOPICS

1. Haemostasis + Anticoagulants (appears almost every exam as Long Essay)
2. Urine Examination (physical + microscopic, preservatives, casts)
3. ESR - definition, methods, causes of increase
4. Sputum Examination
5. CSF Examination (collection, findings in pyogenic meningitis)
6. Shock - definition, types, examples
7. Wound Healing - primary intention, factors affecting
8. Inflammation - causes, signs, types, outcomes
9. Tumors - benign vs malignant, grading, staging, oncogenes
10. Blood Grouping - ABO, Rh, crossmatching

Exam Pattern: Two paper formats exist - 80 marks (Short Essays + Short Answers + To the Point) and 100 marks (Long Essays + Short Essays + Short Answers). Prepare Long Essay topics well for 100-mark papers.

🔬 NEOPLASIA

Long Essays (10 marks)

• List differences between Benign and Malignant Tumours (Jul 2021)

Short Essays (5 marks)

• Role of oncogenes in cancer (Jul 2022)
• Modes of spread of tumors (Jul 2022)
• Tabulate the differences in benign and malignant tumors (May 2023)
• Define Neoplasia. Explain Grading and staging of cancers (May 2023)
• Modes of carcinogenesis (Nov 2023)

Short Answers (3 marks)

• List 3 differences between benign and malignant tumours (Nov 2023)
• Grading of tumors (Jul 2022)
• Name three autoimmune diseases (Jul 2022)
• Name three oncogenes (Jul 2022)
• Clinical symptoms of Cancer (Jul 2021)

To the Point (2 marks)

• (No direct 2-mark neoplasia questions found)

💧 EDEMA

Long Essays (10 marks)

• (None as standalone LE)

Short Essays (5 marks)

• Define Edema, discuss pathogenesis of the same (Jul 2021)
• Types of edema (Nov 2023)
• What is Edema? List the causes of Edema (May 2023)

Short Answers (3 marks)

• (Covered within inflammation/shock topics)

🔄 TRANSUDATE vs EXUDATE

Short Essays (5 marks)

• Differences between Exudate and Transudate (Jul 2022)
• Differences between Transudate and Exudate (Jul 2021)
• List the differences between Transudate and Exudate (May 2023)

⚠️ Appears in EVERY exam - very high priority!

💥 SHOCK

Long Essays (10 marks)

• Definition, types and stages of shock (Jul 2022)

Short Essays (5 marks)

• What is infarction? Explain the types of infarction OR Define shock. List the types of shock and give examples (May 2023)

Short Answers (3 marks)

• Name three types of shock (Nov 2023)
• Name three types of shock (Jul 2022)
• Enumerate various types of shock (Jul 2021)

🩸 THROMBOSIS

Long Essays (10 marks)

• Define thrombosis. Describe the mechanism of formation and fate of thrombus (Nov 2023)

Short Essays (5 marks)

• Mechanism of thrombus formation (Jul 2022)

Short Answers (3 marks)

• What are the components of Virchow's triad? (May 2023)

🫁 EMBOLISM

Short Essays (5 marks)

• Fat embolism (Nov 2023)

Short Answers (3 marks)

• Enumerate types of embolism (Jul 2021)
• List any three types of Emboli (May 2023)

❤️ INFARCTION

Short Essays (5 marks)

• What is infarction? Explain the types of infarction (May 2023)

Short Answers (3 marks)

• Define infarction (Nov 2023)

📊 FREQUENCY SUMMARY TABLE

🎯 PRIORITY ORDER FOR THESE TOPICS

1. Neoplasia - most questions, most variety
2. Shock - comes every exam, including as Long Essay
3. Thrombosis - came as Long Essay in Nov 2023
4. Edema / Transudate-Exudate - guaranteed short essay
5. Embolism + Infarction - usually asked together

🩸 ESR (Erythrocyte Sedimentation Rate)

Short Essays (5 marks)

• Define ESR. Explain any one method of estimation for the same (Jul 2021)
• Define ESR. Explain any one method of estimation for the same OR Define Atrophy, explain types with example (Jul 2021)
• Define ESR. Describe the methods of determining ESR and causes of increased ESR (May 2023)

Short Answers (3 marks)

• What is Erythrocyte Sedimentation Rate (ESR)? Mention two methods of measuring ESR (Dec 2022)
• Stages of ESR OR Define Prothrombin Time (PT) (Nov 2023)
• Stages of erythrocyte sedimentation rate (Oct 2019)

📌 Key points to cover: Definition, Westergren method (principle + procedure), stages (aggregation, sedimentation, packing), normal values (M: 0-15mm/hr, F: 0-20mm/hr), causes of increased ESR

🧪 PCV / HEMATOCRIT / PACKED CELL VOLUME

Long Essays (10 marks)

• Define Packed Cell Volume. Explain one method with principle and procedure for the same OR List differences between Benign and Malignant Tumours (Jul 2021)

Short Essays (5 marks)

• Packed Cell Volume (Jul 2022 - 80 marks paper)
• Packed Cell Volume OR Blood compatibility testing (Nov 2023)
• Describe the measurement of Haematocrit (Dec 2022)
• Packed cell volume (Oct 2019)

Short Answers (3 marks)

• What is Hematocrit? Write its normal range OR Mention the types of Crossmatching (May 2023)

📌 Key points: Definition, Wintrobe method (principle, procedure, calculation), microhematocrit method, normal values (M: 40-54%, F: 37-47%), clinical significance

🩺 HAEMOSTASIS

Long Essays (10 marks)

• Describe normal hemostasis. Add a note on anti-coagulants (Nov 2023)
• Describe normal haemostasis OR Definition, types and stages of shock (Jul 2022)

Short Essays (5 marks)

• Normal haemostasis (Jul 2022 - 80 marks paper)

Short Answers (3 marks)

• (Covered through BT/CT/PT/APTT questions)

📌 Key points: Primary haemostasis (vascular spasm + platelet plug), secondary haemostasis (coagulation cascade - intrinsic/extrinsic/common pathway), fibrinolysis, role of fibrin

⚠️ Appears as Long Essay TWICE - must prepare in full detail

⏱️ BT / CT (Bleeding Time & Clotting Time)

Short Essays (5 marks)

• Define bleeding time. Explain any one method (Nov 2023)
• Explain procedure for estimation of clotting time (Jul 2021)

Short Answers (3 marks)

• Normal values of bleeding time and clotting time (Jul 2022 - 80 marks paper)
• Give the normal values of bleeding time and clotting time OR Name the clinical symptoms of Cancer (Jul 2021)
• Define clotting time (Dec 2022)

📌 Normal values:

• BT: 1-5 minutes (Duke's method) / 2-9 minutes (Ivy's method)
• CT: 5-11 minutes (Lee-White method)

⏱️ PT (Prothrombin Time)

Short Answers (3 marks)

• Prothrombin time (Oct 2019)
• Stages of ESR OR Define Prothrombin Time (PT) (Nov 2023)

📌 Key points: Tests extrinsic + common pathway, normal value 11-13.5 seconds, uses thromboplastin + calcium, reported as INR, prolonged in Vit K deficiency / warfarin therapy / liver disease

⏱️ APTT (Activated Partial Thromboplastin Time)

Short Essays (5 marks)

• Write the principle of APTT. List three causes of prolonged APTT (May 2023)

Short Answers (3 marks)

• Activated Partial Thromboplastin Time (APTT) (Dec 2022)
• Define APTT (activated partial thromboplastin time) (Jul 2022)

📌 Key points: Tests intrinsic + common pathway, normal value 25-35 seconds, prolonged in haemophilia A & B / heparin therapy / factor deficiencies

🔬 CELL INJURY

Short Essays (5 marks)

• Types of cell injury (Nov 2023)

Short Answers (3 marks)

• What is Cell injury? Mention types of cell injury OR What are the components of Virchow's triad? (May 2023)

📌 Key points: Causes (hypoxia, physical, chemical, biological, immunological, nutritional, genetic), reversible injury (cellular swelling, fatty change), irreversible injury → necrosis/apoptosis; mechanisms - free radical injury, ATP depletion, calcium influx, membrane damage

📊 FREQUENCY SUMMARY

🎯 PRIORITY ORDER

1. Haemostasis - Long Essay level, include coagulation cascade diagram
2. PCV - Long Essay + Short Essay both, very high frequency
3. ESR - Short Essay every exam, know both methods + stages
4. BT/CT - Normal values + methods always asked
5. APTT - Principle + causes of prolongation
6. PT - Definition + clinical significance
7. Cell Injury - Types + mechanisms

Estimation of Haemoglobin

METHODS OF Hb ESTIMATION

1. SAHLI'S METHOD (Acid Haematin Method)

Principle

Requirements

• Sahli's haemoglobinometer
• Sahli's pipette (20 µL / 0.02 mL)
• Graduated tube (comparator tube)
• N/10 HCl
• Distilled water
• Glass stirring rod

Procedure

1. Fill the graduated tube with N/10 HCl up to the 2 g/dL mark
2. Draw blood up to the 20 µL mark in Sahli's pipette (wipe outside)
3. Blow blood into the HCl tube - mix well
4. Wait 10 minutes for acid haematin to form (brown colour)
5. Add distilled water drop by drop, stirring after each drop
6. Compare against the brown glass standard by holding tube in front of comparator
7. Stop adding water when the colour matches exactly
8. Read the value directly in g/dL

Advantages

• Simple, inexpensive
• No electricity required
• Portable - useful in field settings

Disadvantages

• Subjective (colour comparison by naked eye)
• Not accurate for abnormal Hb (HbS, HbC, HbF, MetHb, COHb)
• Colour of acid haematin fades on standing
• Not standardizable - least accurate method

Normal Values

• Adult Male: 13-17 g/dL
• Adult Female: 12-15 g/dL
• Newborn: 14-20 g/dL
• Children (6-12 yrs): 11.5-15.5 g/dL

2. CYANMETHAEMOGLOBIN METHOD (Drabkin's Method)

Principle

• Potassium ferricyanide oxidises Hb → methaemoglobin (MetHb)
• Potassium cyanide converts MetHb → cyanmethaemoglobin (HiCN)
• HiCN has a stable colour read at 540 nm in a colorimeter/spectrophotometer
• Concentration calculated using a standard curve

Drabkin's Reagent Composition

• Potassium ferricyanide - K₃Fe(CN)₆
• Potassium cyanide - KCN
• Sodium bicarbonate - NaHCO₃
• Distilled water

Procedure

1. Pipette 5 mL of Drabkin's reagent into a test tube
2. Add 20 µL of blood - mix well
3. Wait 10 minutes at room temperature
4. Read absorbance at 540 nm
5. Calculate Hb concentration using standard graph or formula

Advantages

• Most accurate (WHO gold standard)
• All forms of Hb converted except sulphaemoglobin
• Stable colour - result reproducible
• Can be standardized

Disadvantages

• Requires colorimeter/spectrophotometer
• KCN is toxic/poisonous - careful disposal needed
• Not suitable for field use

3. DARE'S METHOD (Visual Colorimetry)

Principle

Note

• Rarely asked in detail
• Simple but inaccurate
• Affected by turbidity

4. COPPER SULPHATE METHOD (Specific Gravity)

Principle

• If Hb ≥ 12.5 g/dL → drop sinks (blood denser than solution)
• If Hb < 12.5 g/dL → drop floats

Use

• Screening donors before blood donation (quick test)
• Not used for exact measurement

QUICK COMPARISON TABLE

NORMAL Hb VALUES (Must Memorize)

PYQ APPEARANCES

🎯 EXAM TIPS

• For 5-mark question: Write Sahli's method in full (principle + procedure + normal values)
• For 10-mark question: Write all methods briefly + Sahli's + Cyanmethaemoglobin in detail + comparison table
• For 3-mark question: Principle of Sahli's + normal values
• Always draw Sahli's haemoglobinometer diagram if asked
• Cyanmethaemoglobin = gold standard - mention this always

Normal Haemostasis - 5 Mark Answer Plan

1. DEFINITION (2-3 lines)

2. STEPS OF HAEMOSTASIS

Step 1 - Vascular Spasm (Vasoconstriction)

• Immediate reflex contraction of the injured vessel wall
• Reduces blood flow to the area
• Lasts a few minutes

Step 2 - Primary Haemostasis (Platelet Plug Formation)

• Platelet adhesion → platelets stick to exposed collagen via von Willebrand factor (vWF)
• Platelet activation → platelets release ADP, thromboxane A2 (TXA2)
• Platelet aggregation → more platelets recruited → temporary platelet plug formed

Step 3 - Secondary Haemostasis (Coagulation Cascade)

• Two pathways activate:
  • Extrinsic pathway → triggered by tissue factor (TF) from injured tissue
  • Intrinsic pathway → triggered by exposed collagen
  • Both converge at Factor X → Common pathway
• Final result: Fibrinogen → Fibrin (by thrombin)
• Fibrin reinforces the platelet plug → stable clot

3. DIAGRAM (must draw this)

Vessel Injury
     ↓
Vascular Spasm
     ↓
Platelet Plug (Primary)
     ↓
Coagulation Cascade (Secondary)
     ↓
Extrinsic (TF + VII) ──┐
                        ├──→ Factor X activated
Intrinsic (XII→XI→IX→VIII)──┘
                        ↓
              Prothrombin → Thrombin
                        ↓
              Fibrinogen → Fibrin clot

4. FIBRINOLYSIS (1-2 lines)

• Once healing occurs, plasminogen → plasmin (by tPA)
• Plasmin dissolves the fibrin clot
• Maintains balance between clot formation and dissolution

✅ WHAT TO INCLUDE FOR 5 MARKS - CHECKLIST

❌ WHAT TO SKIP FOR 5 MARKS

• Do NOT write all individual clotting factors in detail
• Do NOT write full intrinsic/extrinsic pathway step by step
• Skip anticoagulants (save that for 10-mark version)
• No need for disorders of haemostasis

💡 KEY TERMS TO USE