Which statement is not used to describe normal kidney size in the data?

Which statement is not used to describe normal kidney size in the data?

• A. Length
• B. AP diameter
• C. Volume
• D. Width

Answer: (C)

In ultrasound, normal kidney size is described with linear measurements in three directions: length along the long axis, width across the kidney, and the anteroposterior (AP) diameter. These dimensions provide a simple, reproducible description that matches how data sets typically report kidney size. Volume can be estimated using those three measurements through an ellipsoid formula, but it’s not routinely included in standard normative data for kidney size because volume estimates vary with technique and have less universally established reference ranges. Since the data you’re studying uses length, width, and AP diameter to describe normal size, volume is the element that isn’t used.

In ultrasound, normal kidney size is described with linear measurements in three directions: length along the long axis, width across the kidney, and the anteroposterior (AP) diameter. These dimensions provide a simple, reproducible description that matches how data sets typically report kidney size. Volume can be estimated using those three measurements through an ellipsoid formula, but it’s not routinely included in standard normative data for kidney size because volume estimates vary with technique and have less universally established reference ranges. Since the data you’re studying uses length, width, and AP diameter to describe normal size, volume is the element that isn’t used.