A 26-year-old woman has episodic hypeension with headache, diaphoresis, and palpitation. Which of the following diagnostic procedures would be most useful in evaluating the possibility that pheochromocytoma might be the cause of these findings?
- Urinary vanillylmandelic acid & metanephrines - metabolites of epinephrine & norepinephrine - markedly elevated in pheochromocytoma. - Serum C-peptide is elevated in insulinoma. - Serum calcitonin is sometimes used to screen for medullary carcinoma of the thyroid.
Serum C-peptide
Serum calcitonin
Urinary vanillylmandelic acid
Urinary aldosterone
Adrenal Gland