Which of the following endocrine markers is used as a diagnostic indicator for pheochromocytoma?

A Plasma metanephrine ✓
B Urinary vanillylmandelic acid
C Serum cortisol
D Plasma aldosterone

Explanation

Plasma metanephrine is a sensitive and specific marker for the diagnosis of pheochromocytoma, a rare tumor of the adrenal gland.

Source

Harrison's Principles of Internal Medicine
Hormones and Endocrine Markers Endocrinology Pheochromocytoma Hard MEDICAL Confidence: high