Normal Gallbladder Size in Adults

General Measurements

• The normal gallbladder in adults measures approximately 7-10 cm in length and up to 3.5-4 cm in transverse diameter, with a wall thickness less than 3 mm 1, 2

Transverse Diameter

• The transverse diameter should not exceed 5 cm under normal circumstances 1
• When the transverse diameter exceeds 5 cm, this may indicate cholecystitis or pathologic distension 1

Wall Thickness

• Normal gallbladder wall thickness is less than 3 mm when measured on the anterior wall between the lumen and hepatic parenchyma 1, 3
• Wall thickness greater than 3 mm is considered abnormal and suggests acute cholecystitis or other pathology 1, 3

Clinical Context

• Measurements should be interpreted in the clinical context rather than relying on absolute cutoffs alone 1
• Gross increases in size may indicate hydrops, while increased transverse diameter suggests cholecystitis 1

Common Pitfalls

• Do not diagnose pathology based solely on size measurements without considering wall thickness, pericholecystic fluid, and sonographic Murphy's sign 1
• Avoid measuring the gallbladder through bowel gas or when patient positioning limits adequate visualization 2
• Remember that the gallbladder may be completely surrounded by hepatic parenchyma in some patients, requiring intercostal scanning approaches 2