Initial Endocrine Disorder Labs

Question 1

Suspected prolactinoma

Answer 1

Serum prolactin (could also be elevated physiologically d/t pregnancy)

Question 2

Suspected acromegaly

Answer 2

Insulin like growth factor (IGF-1, which mediates growth hormone effects)

Question 3

Suspected thyroid dysfunction

Answer 3

Serum TSH

Question 4

Suspected primary hyperparathyroidism

Answer 4

Serum calcium

Question 5

Suspected Cushing’s

Answer 5

Urine free cortisol, late night salivary cortisol, dexamethasone suppression testing

Question 6

Suspected adrenal insufficiency

Answer 6

Early morning basal serum cortisol, ACTH stimulation test

Question 7

Suspected pheochromocytoma

Answer 7

Plasma fractionated free metanephrines, 24 hour urine catecholamines and metanephrines

Question 8

Suspected diabetes mellitus

Answer 8

Plasma glucose (Fasting), oral glucose tolerance test, Hb A1C