Sample Requirements:
EDTA tube, frozen immediately
Purpose:
Used to diagnose pheochromocytoma or other adrenal tumors.
High Levels:
Suggests pheochromocytoma or sympathetic overactivity.
Low Levels:
Typically normal.
Reference Range:
Metanephrine: <57 pg/mL; Normetanephrine: <148 pg/mL