Table 2.

Biliary Tree Reference Ranges Compiled From Healthy Volunteers

Measurement	Reference range
Tree volume (mL)	1.2–8.8
Gallbladder volume (mL)	6.7–39.8
3–5 mm (%)	3.0–37.0
5–7 mm (%)	0.0–14.0
Greater than 7 mm (%)	0.0–3.0
Less than 3 mm (%)	60–95