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How to Read a USG (Ultrasound) Report
USG stands for Ultrasound Sonography - the same as "echography." The report is a written summary of what the radiologist sees in the scan images. Here is a complete guide to understanding it.
1. The Physics Behind the Image (Why Things Look Black, Gray, or White)
Ultrasound sends high-frequency sound waves (1-20 MHz) into the body. When those waves bounce back (echo), the machine converts them into a grayscale image. The key concept is echogenicity - how well a tissue reflects sound:
| Appearance on Screen | Term | What It Means | Examples |
|---|---|---|---|
| Black | Anechoic | No echoes - sound passes right through | Fluid, urine, blood, bile, amniotic fluid |
| Dark gray | Hypoechoic | Few echoes returned | Soft tissue, muscles, most solid organs |
| Bright white | Hyperechoic | Many echoes reflected | Bone, calcium, fat, air, stones |
| Mix of gray shades | Isoechoic | Same echogenicity as surrounding tissue | Normal organ parenchyma |
From Textbook of Clinical Echocardiography: "The velocity of propagation in bone is much faster (~3000 m/s) than in lung tissue (~700 m/s)... Knowledge of the strengths, and more importantly the limitations, of this technique is critical for correct clinical diagnosis."
Key rule: Denser tissue = brighter (more white). Fluid = black. Bone or stone = bright white, often with a posterior acoustic shadow (dark stripe behind it).
2. Parts of a USG Report
A standard USG report has these sections:
A. Patient & Exam Header
- Patient name, age, sex, ID
- Date/time of scan
- Referring doctor
- Type of exam (e.g., "USG Abdomen", "USG Kidney", "Obstetric USG")
B. Indication
Why the scan was ordered - e.g., "right flank pain," "first trimester pregnancy check," "follow-up liver lesion."
C. Technique
The method used - B-mode (standard grayscale), Doppler (blood flow), 3D/4D, transvaginal, transrectal, etc.
D. Findings (The Most Important Section)
This is where each organ or structure is described systematically:
| Descriptor | What the Radiologist Checks |
|---|---|
| Size | Measured in cm (length × width × height) |
| Shape | Normal / enlarged / shrunken |
| Echotexture | Normal, increased echogenicity, heterogeneous |
| Contour/Margins | Smooth, irregular, lobulated |
| Lesions | Cystic (black, well-defined) vs. solid (gray/white, irregular) |
| Vascularity | Blood flow on Doppler - increased/decreased/absent |
| Posterior effects | Posterior shadowing (stone/bone), posterior enhancement (cyst) |
E. Impression / Conclusion
The radiologist's summary diagnosis based on findings - the most clinically actionable part. Example:
"Right renal calculus with Grade II hydronephrosis. Features suggestive of chronic medical renal disease (right side). Left kidney appears normal."
Here is a real example of a kidney USG report with its structure:
3. Common Terms You Will See
| Term | Meaning |
|---|---|
| Echogenic focus | Bright spot (often calcium or stone) |
| Posterior acoustic shadow | Dark stripe behind a stone or bone |
| Posterior acoustic enhancement | Brighter area behind a fluid-filled cyst |
| Heterogeneous | Mixed echo pattern - may suggest pathology |
| Homogeneous | Uniform echo pattern - usually normal |
| Cortico-medullary differentiation | Kidney: visible boundary between cortex and medulla (preserved = normal) |
| Pelvicalyceal system (PCS) dilated | Hydronephrosis - fluid backing up in kidney |
| Free fluid | Anechoic (black) collection in abdomen - abnormal outside of ascites context |
| No focal lesion | No cyst or mass seen - normal |
| Well-defined / ill-defined | Describes lesion margins - ill-defined can suggest malignancy |
Phrases meaning normal:
- "No evidence of..."
- "Expected size and placement"
- "Within normal limits"
- "Unremarkable"
Phrases that need follow-up:
- "Indeterminate lesion"
- "Hypoechoic nodule"
- "Suspect / suspicious for"
- "Further evaluation recommended"
4. Reading an Obstetric (Pregnancy) USG
Obstetric Abbreviations Explained
| Abbreviation | Full Form | Purpose |
|---|---|---|
| GA | Gestational Age | Fetal age from last menstrual period |
| EDD | Estimated Due Date | LMP + 9 months + 7 days |
| CRL | Crown-Rump Length | Measures gestational age at 6-13 weeks |
| BPD | Biparietal Diameter | Head width - assesses growth at 14-20 weeks |
| HC | Head Circumference | Overall head size |
| AC | Abdominal Circumference | Fetal abdominal growth |
| FL | Femur Length | Thigh bone length |
| EFW | Estimated Fetal Weight | Calculated from FL, HC, AC |
| FHR | Fetal Heart Rate | Normal: 110-160 bpm |
| AFI | Amniotic Fluid Index | Normal: 8-18 cm (after week 24) |
| GS | Gestational Sac | Confirms pregnancy in early weeks |
| MVP | Maximum Vertical Pocket | Amniotic fluid assessment |
5. Reading Doppler USG
Doppler is used to assess blood flow:
- Red on color Doppler = blood flowing toward the probe
- Blue on color Doppler = blood flowing away from the probe
- Spectral waveform = shows velocity and resistance of flow
- Resistive Index (RI) = measures downstream resistance (elevated in kidney disease, tumors)
- Peak Systolic Velocity (PSV) = useful for detecting arterial stenosis
6. Quick Organ-by-Organ Reference
| Organ | Normal Findings on Report |
|---|---|
| Liver | Normal size (~15 cm in midclavicular line), homogeneous echogenicity, no focal lesion, no duct dilatation |
| Gallbladder | Wall thickness <3 mm, no calculi, no pericholecystic fluid |
| Pancreas | Echogenic, homogeneous, duct <2 mm |
| Kidneys | Size ~10-12 cm, cortical thickness >1 cm, CMD preserved, PCS not dilated |
| Uterus | Normal size varies by age/parity, normal endometrial thickness |
| Ovaries | Size ~3×2×2 cm, no dominant follicle (outside ovulation) |
| Bladder | Well-distended, wall thickness <3 mm, no intraluminal mass, post-void residual <50 mL |
7. Tips for Reading Any USG Report
- Read the Impression first - it gives you the summary answer
- Then read Findings - understand the evidence behind the impression
- Note measurements - compare to normal ranges (above)
- Flag "indeterminate" or "recommend correlation" - these need clinical follow-up
- Don't interpret in isolation - USG findings must always be combined with symptoms, labs, and clinical history
A USG report does not replace your doctor's interpretation. The same finding (e.g., a hypoechoic nodule) can be benign or malignant depending on context.
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