Abdomen
Ultrasound
Common Bile Duct Diameter
≤6 mm
Normal Value
Add 1 mm per decade of age after 60 years. May be dilated post-cholecystectomy. Plane: Longitudinal or oblique.
Liver span (midclavicular line)
13–15.5 cm
Normal Value
Slight variation with body size/sex. Plane: Longitudinal, right subcostal view
Portal vein diameter
≤13 mm
Normal Value
Assessed with quiet respiration. Plane: Transverse epigastric view
Gallbladder wall thickness
≤3 mm
Normal Value
Measured in fasting state. Plane: Transverse or longitudinal
Pancreatic head
2.0–3.0 cm
Normal Value
Variable depending on body habitus. Plane: Transverse epigastric view
Pancreatic body
1.5–2.5 cm
Normal Value
Plane: Transverse
Spleen length
≤12 cm
Normal Value
Longitudinal measurement. Plane: Left upper quadrant, intercostal
Spleen thickness
<4–5 cm
Normal Value
Plane: Longitudinal
Kidney length (adult)
9–12 cm
Normal Value
Left usually slightly larger than right. Plane: Longitudinal
Cortical thickness
6–10 mm
Normal Value
Measured from base of pyramid to capsule. Plane: Longitudinal
Parenchymal thickness
1.5–2.5 cm
Normal Value
Cortex + medulla. Plane: Longitudinal