How to read Echo report
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I now have enough information to give a thorough answer. Here's a complete guide to reading an echocardiography (Echo) report:
How to Read an Echocardiography (Echo) Report
An echo report is organized around four main domains: cardiac chambers, valves, great vessels, and a summary/conclusion. Here is a systematic approach:
1. Patient and Study Information (Header)
- Patient demographics, date, study type (TTE = transthoracic, TEE = transesophageal, Stress Echo)
- Indication for the study
- Image quality/window (poor window limits accuracy)
2. Left Ventricle (LV) - The Most Important Section
LV Size
| Measurement | Normal (Men) | Normal (Women) |
|---|---|---|
| LV internal diameter diastole (LVIDd) | 42-59 mm | 39-53 mm |
| LV internal diameter systole (LVIDs) | 25-40 mm | 22-35 mm |
| Interventricular septum (IVS) | 6-10 mm | 6-9 mm |
| Posterior wall thickness (PWT) | 6-10 mm | 6-9 mm |
LV Systolic Function
- Ejection Fraction (EF): The most reported number. It is the fraction of blood pumped out with each beat.
- Normal: 55-70%
- Mildly reduced: 45-54%
- Moderately reduced: 30-44%
- Severely reduced: <30%
- Note: EF tends to be slightly higher in women.
- Wall motion: Report will describe each segment as normal, hypokinetic (reduced movement), akinetic (no movement), dyskinetic (paradoxical movement), or aneurysmal. This maps to a 17-segment model.
- GLS (Global Longitudinal Strain): A more sensitive marker of systolic dysfunction than EF. Normal is approximately -18% to -20% (more negative = better). It can detect early dysfunction even when EF is preserved.
3. LV Diastolic Function
This is assessed using Doppler across the mitral valve and tissue Doppler imaging (TDI). Diastolic dysfunction is graded I-III.
| Grade | Pattern | E:A Ratio | E' | E/E' | Meaning |
|---|---|---|---|---|---|
| Normal | Normal filling | >1 | Normal | <8 | Normal LV relaxation and filling pressures |
| Grade 1 | Impaired relaxation | E < A (ratio <0.8) | Reduced | Low | Early dysfunction; LA pressure normal |
| Grade 2 | Pseudonormal | E/A 0.8-2 | Reduced | 8-14 | Moderate; elevated filling pressures |
| Grade 3 | Restrictive | E >> A (ratio >2) | Markedly reduced | >14 | Severe; markedly elevated filling pressures |
Key parameters:
- E wave: Peak early mitral inflow velocity
- A wave: Peak late mitral inflow (atrial kick)
- E': Early diastolic mitral annular velocity on TDI (lateral e' ≥10 cm/s is normal; excludes diastolic dysfunction)
- E/E' ratio: Estimates LV filling pressure - <8 is normal, >14 signals elevated filling pressures
- Left Atrial Volume Index (LAVI): >34 mL/m² indicates chronically elevated filling pressures (marker of diastolic dysfunction)
4. Right Ventricle (RV)
- Size: Often described qualitatively (normal, mildly/moderately/severely dilated). RVEDD may be quoted.
- Systolic function:
- TAPSE (Tricuspid Annular Plane Systolic Excursion): Normal ≥17 mm. Below this suggests RV dysfunction.
- S' (tricuspid annular tissue velocity): Normal ≥9.5 cm/s
- RV free wall strain: Normal approximately -20% or better
5. Atria
- Left Atrium (LA): LA volume index (LAVI) is most important - normal <34 mL/m². LA enlargement indicates long-standing elevated filling pressures or AF.
- Right Atrium (RA): Size and presence of IVC dilation (used to estimate RAP).
6. Valves
All valve abnormalities are graded mild, moderate, or severe.
Aortic Valve (AV)
- Aortic Stenosis (AS): Key parameters:
- Mean gradient: Normal <5 mmHg; severe ≥40 mmHg
- Peak velocity: Severe ≥4 m/s
- Aortic valve area (AVA): Severe ≤1.0 cm²
- Aortic Regurgitation (AR): Assessed by vena contracta width, pressure half-time, regurgitant fraction
Mitral Valve (MV)
- Mitral Stenosis (MS): MVA (valve area) - severe ≤1.5 cm²; mean gradient severe ≥10 mmHg
- Mitral Regurgitation (MR): The single most important parameter is LV size (determines surgical timing). Jet area, vena contracta, and EROA (effective regurgitant orifice area) are used to grade severity.
Tricuspid and Pulmonary Valves
- Regurgitation and stenosis graded similarly; pulmonary hypertension often detected via tricuspid regurgitation jet velocity.
7. Pulmonary Pressures (PASP)
- Estimated from TR (tricuspid regurgitation) jet velocity using the modified Bernoulli equation plus estimated right atrial pressure (RAP).
- Normal PASP: <35 mmHg
- Mild pulmonary hypertension: 36-50 mmHg
- Severe: >50 mmHg
- Indirect signs of pulmonary hypertension: RV dilation, flattened interventricular septum ("D-sign"), dilated IVC
8. Pericardium
- Normal: No effusion
- Effusion graded by size: small (<10 mm), moderate (10-20 mm), large (>20 mm)
- Cardiac tamponade signs: RV/RA diastolic collapse, dilated non-collapsing IVC, respiratory variation in flows
9. Aorta
- Aortic root (sinuses): Normal ≤40 mm
- Ascending aorta: Normal ≤40 mm
- Surgical threshold for intervention: Generally ≥55 mm (lower for bicuspid AV, Marfan, or other aortopathies)
10. The Conclusion / Summary
This is the most clinically actionable part. It will state:
- Overall LV systolic function and EF
- Presence and grade of diastolic dysfunction
- Significant valve lesions and their grade
- Pulmonary pressures
- Any incidental findings
Tip: If the conclusion contradicts the detailed measurements, the conclusion (written by the cardiologist) typically takes priority, as it integrates image quality and clinical context.
Quick Reference: Common Abbreviations
| Abbreviation | Meaning |
|---|---|
| EF | Ejection fraction |
| LVEF | Left ventricular ejection fraction |
| EDV/ESV | End-diastolic/end-systolic volume |
| IVS | Interventricular septum |
| LVIDd/s | LV internal diameter diastole/systole |
| LAVI | Left atrial volume index |
| TAPSE | Tricuspid annular plane systolic excursion |
| PASP | Pulmonary artery systolic pressure |
| MR/AR/TR | Mitral/aortic/tricuspid regurgitation |
| AS/MS | Aortic/mitral stenosis |
| WMA | Wall motion abnormality |
| GLS | Global longitudinal strain |
| RWMA | Regional wall motion abnormality |
| PHT | Pressure half-time |
Sources: Miller's Anesthesia 10e; Harrison's Principles of Internal Medicine 22e; Textbook of Clinical Echocardiography - Otto; Cardiology Institute GP guide
Complete Blood Count
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I now have comprehensive textbook data to deliver a complete, well-structured guide to the CBC. Here it is:
Complete Blood Count (CBC) - A Full Guide
A CBC is one of the most commonly ordered lab panels. It measures the three main cellular components of blood - red blood cells (RBCs), white blood cells (WBCs), and platelets - along with a range of calculated indices. Modern automated counters analyze ~10,000 cells per category using flow cytometry and electrical impedance.
SECTION 1: RED BLOOD CELLS (RBC Line)
Core Measurements
| Parameter | Normal - Male | Normal - Female | What It Measures |
|---|---|---|---|
| Hemoglobin (Hb/Hgb) | 13.5-17.5 g/dL | 12.0-16.0 g/dL | O₂-carrying capacity of blood |
| Hematocrit (Hct/PCV) | 39-49% | 35-45% | % volume of RBCs in blood |
| RBC Count | 4.3-5.7 × 10⁶/μL | 3.8-5.1 × 10⁶/μL | Number of red cells per unit volume |
Key point: Hct is approximately 3× the Hb value. In acute hemorrhage, Hb and Hct may be falsely normal for 12-24 hours until plasma volume equilibrates.
Red Cell Indices (Calculated Parameters)
| Index | Normal Range | Formula | What It Tells You |
|---|---|---|---|
| MCV (Mean Corpuscular Volume) | 80-100 fL | Hct ÷ RBC count | Size of RBCs (micro/normo/macrocytic) |
| MCH (Mean Corpuscular Hemoglobin) | 26-34 pg/cell | Hb ÷ RBC count | Weight of Hb in average RBC |
| MCHC (Mean Corpuscular Hb Concentration) | 31-37 g/dL | Hb ÷ Hct | Hb concentration per unit of packed RBCs |
| RDW (Red Cell Distribution Width) | 11.5-14.5% | SD of MCV ÷ MCV | Variability in RBC size (anisocytosis) |
MCV in early anemia: MCV can change before Hb and Hct - it is an early marker. Also note: if both microcytic and macrocytic cells are present together, the MCV may appear falsely normal - the RDW will be elevated in this scenario.
Classifying Anemia by MCV
Microcytic Anemia (MCV <80 fL)
- Iron deficiency anemia (most common - check ferritin; <30 ng/mL is diagnostic)
- Thalassemia
- Anemia of chronic disease/inflammation
- Sideroblastic anemia
Normocytic Anemia (MCV 80-100 fL)
- Acute blood loss
- Hemolysis
- Renal disease (low EPO)
- Aplastic anemia
- Endocrinopathies
- Bone marrow infiltration, myeloma
Macrocytic Anemia (MCV >100 fL)
- Oval macrocytes (DNA synthesis defect): B12 deficiency, folate deficiency, chemotherapy, myelodysplasia
- Round macrocytes (membrane defect): Alcohol use, liver disease, hypothyroidism, reticulocytosis
Classifying Anemia by Mechanism (Reticulocyte Count)
The absolute reticulocyte count (normal: 20,000-100,000/μL; ~0.5-1.5%) is the key separator:
| Reticulocyte Count | Mechanism | Interpretation |
|---|---|---|
| Elevated (>2%) | Hyperproductive | Bone marrow responding normally - blood loss or hemolysis |
| Low/Normal (<2%) | Underproductive | Bone marrow failing - iron/B12/folate deficiency, aplasia, renal disease |
RDW Interpretation
| MCV | RDW Normal | RDW Elevated |
|---|---|---|
| Low MCV | Thalassemia trait | Iron deficiency anemia |
| Normal MCV | Anemia of chronic disease | Mixed deficiency, early iron/B12 deficiency |
| High MCV | Aplastic anemia, liver disease | B12/folate deficiency, mixed deficiency |
SECTION 2: WHITE BLOOD CELLS (WBC Line)
Total WBC Count
| Finding | Count | Common Causes |
|---|---|---|
| Normal | 4,500-11,000/μL | - |
| Leukocytosis | >11,000/μL | Infection, inflammation, stress, corticosteroids, pregnancy, exercise |
| Hyperleukocytosis | >100,000/μL | Leukemia (until proven otherwise) |
| Leukopenia | <4,500/μL | Chemotherapy, radiation, autoimmune disease, aplastic anemia, HIV, certain drugs (antipsychotics, antiepileptics) |
WBC Differential - The 5-Part Breakdown
The differential counts the percentage of each WBC type out of 100 WBCs counted:
| Cell Type | Normal % | Normal Absolute | High (↑) Suggests | Low (↓) Suggests |
|---|---|---|---|---|
| Neutrophils | 50-70% | 1,800-7,700/μL | Bacterial infection, inflammation, steroids, stress, burns | Viral infection, drugs (clozapine, carbimazole), chemotherapy, aplasia |
| Lymphocytes | 20-40% | 1,000-4,800/μL | Viral infection (EBV, CMV), CLL, pertussis | HIV/AIDS, immunosuppression, steroids |
| Monocytes | 2-8% | 200-800/μL | Chronic infection (TB, SBE), IBD, monocytic leukemia | Bone marrow suppression |
| Eosinophils | 1-4% | 100-400/μL | Allergy, asthma, parasitic infection, drug reaction, Addison's disease | Acute bacterial infection, steroids |
| Basophils | 0-1% | 0-100/μL | Allergic reactions, CML, hypothyroidism | Rarely clinically significant |
Left shift: Increased band neutrophils (immature forms) in the blood. Indicates an acute, overwhelming bacterial infection where the bone marrow releases immature cells to meet demand. Bands >10% is significant.
Hypersegmented neutrophils (>5 lobes): Classic sign of B12 or folate deficiency (megaloblastic anemia).
Key Patterns on the Differential
| Pattern | Clinical Meaning |
|---|---|
| Neutrophilia + left shift | Acute bacterial infection |
| Lymphocytosis + atypical lymphocytes | Viral infection (EBV = "mono") |
| Eosinophilia | NAACP: Neoplasm, Allergy, Addison's, Collagen-vascular disease, Parasites |
| Monocytosis | Chronic infection, recovery phase from acute illness |
| Pancytopenia (all lines low) | Aplastic anemia, bone marrow infiltration, hypersplenism |
| Blast cells | Acute leukemia - urgent hematology referral |
SECTION 3: PLATELETS (Thrombocytes)
| Finding | Count | Clinical Meaning |
|---|---|---|
| Normal | 150,000-400,000/mm³ | - |
| Thrombocytopenia | <150,000/mm³ | See causes below |
| Severe thrombocytopenia | <20,000/mm³ | Risk of spontaneous hemorrhage |
| Thrombocytosis | >400,000/mm³ | See causes below |
Causes of Thrombocytopenia
- Decreased production: Aplastic anemia, leukemia, B12/folate deficiency, chemotherapy, viral infections
- Increased destruction: ITP (immune thrombocytopenic purpura), TTP, HUS, DIC, heparin-induced (HIT), hypersplenism
- Pseudothrombocytopenia: Platelet clumping in EDTA - always check smear or repeat with citrate tube
Causes of Thrombocytosis
- Reactive (most common): Iron deficiency, infection, inflammation, post-splenectomy, surgery
- Primary: Essential thrombocythemia, polycythemia vera (myeloproliferative disorders)
Mean Platelet Volume (MPV): Reflects average platelet size. Large platelets (high MPV) = increased platelet turnover (ITP, recovery). Small platelets (low MPV) = hypoproduction.
SECTION 4: When to Order a Peripheral Blood Smear
Peripheral smear review is essential when:
- Hemolysis suspected (schistocytes in TTP/DIC, spherocytes in AIHA)
- RBC inclusions (malaria, Howell-Jolly bodies, basophilic stippling)
- Myelodysplastic changes
- Megaloblastic changes (hypersegmented neutrophils)
- Thrombocytopenia or leukocytosis for morphology
- Immature or abnormal cells flagged by analyzer
SECTION 5: Quick Reference - Normal Values Summary
| Parameter | Male | Female |
|---|---|---|
| Hb | 13.5-17.5 g/dL | 12.0-16.0 g/dL |
| Hct | 39-49% | 35-45% |
| RBC | 4.3-5.7 × 10⁶/μL | 3.8-5.1 × 10⁶/μL |
| MCV | 80-100 fL | 80-100 fL |
| MCH | 26-34 pg | 26-34 pg |
| MCHC | 31-37 g/dL | 31-37 g/dL |
| RDW | 11.5-14.5% | 11.5-14.5% |
| WBC | 4,500-11,000/μL | 4,500-11,000/μL |
| Neutrophils | 50-70% | 50-70% |
| Lymphocytes | 20-40% | 20-40% |
| Monocytes | 2-8% | 2-8% |
| Eosinophils | 1-4% | 1-4% |
| Basophils | 0-1% | 0-1% |
| Platelets | 150,000-400,000/mm³ | 150,000-400,000/mm³ |
| Reticulocytes | 0.5-1.5% | 0.5-1.5% |
Sources: Goldman-Cecil Medicine International Edition; Harrison's Principles of Internal Medicine 22e; Textbook of Family Medicine 9e; Histology: A Text and Atlas (Mescher); Rosen's Emergency Medicine 10e
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