Normal parathyroid AP is which of the following?

Normal parathyroid AP is which of the following?

• A. 1 to 2 mm
• B. 3 to 4 mm
• C. 5 to 6 mm
• D. 7 to 8 mm

Answer: (A)

Normal parathyroid glands are extremely small, and on ultrasound the anteroposterior (AP) dimension is the smallest measurement we use. The typical AP diameter is about 1 to 2 mm, with the gland often measuring around 3 to 4 mm in its length. So an AP of 1–2 mm sits squarely in the expected normal range. Values larger in the AP dimension (like 3–4 mm, 5–6 mm, or 7–8 mm) would indicate an abnormal enlargement along that axis, which is less consistent with a normal gland.

Normal parathyroid glands are extremely small, and on ultrasound the anteroposterior (AP) dimension is the smallest measurement we use. The typical AP diameter is about 1 to 2 mm, with the gland often measuring around 3 to 4 mm in its length. So an AP of 1–2 mm sits squarely in the expected normal range. Values larger in the AP dimension (like 3–4 mm, 5–6 mm, or 7–8 mm) would indicate an abnormal enlargement along that axis, which is less consistent with a normal gland.