Abdominal Ultrasound Measurements and Organ-Based Reporting

A normal ultrasound measurement is not a single universal number. Plane, respiration, age, height, sex, and caliper location can change the result. The report should preserve the technique and patient context. A borderline value alone is not enough to diagnose organ enlargement or duct dilatation.

Common measurements include craniocaudal liver length, common bile duct caliber, splenic long axis, renal length, and aortic diameter. Bile duct caliber varies with age and cholecystectomy status. Renal length varies with body size and chronic disease. Comparison is strongest when prior measurements used the same plane.

Assessment framework

• Measure in the standard organ axis with calipers perpendicular to the structure.
• Interpret liver size with contour, parenchyma, and clinical context.
• Measure the bile duct inner wall to inner wall and check cholecystectomy history.
• Assess the spleen in a true long axis through the hilum.
• Report renal length with cortical thickness, echogenicity, and collecting-system appearance.

What the report should contain

• Use millimeters or centimeters consistently.
• Recheck technique when the two sides differ substantially.
• Grade steatosis using vessel and diaphragm visibility as well as echogenicity.
• State the level at which aortic diameter was measured.
• For a borderline value, report the measurement, context, and comparison instead of forcing a diagnosis.

Common errors

• Overmeasuring an organ in an oblique plane.
• Applying one threshold to every patient.
• Hiding a technical limitation inside normal template language.

Example report wording

Example impression: The liver has a smooth contour and mildly increased echogenicity compatible with mild steatosis. The intrahepatic ducts are not dilated. The common bile duct measures 5 mm in an appropriate plane. Splenic long axis is 108 mm. Renal size and parenchymal echogenicity are preserved, without hydronephrosis.

Start with the normal complete abdominal ultrasound report, then remove every line that does not match the examination.

References

1. ACR, AIUM, SPR and SRU. Practice Parameter for Ultrasound of the Abdomen and/or Retroperitoneum. Source (opens in a new tab)
2. RadiologyInfo.org. Abdominal Ultrasound. Source (opens in a new tab)

Clinical note: This material is for radiology education. Do not generate an automatic diagnosis or management decision without checking guideline scope, patient factors, and local policy.