Question

Your friend was sent for blood tests and the following results were obtained:

TEST	RESULT	NORMAL RANGE
Hemoglobin	13.8 gm/dL	12-16
Serum Sodium	144 mmol/L	137 - 145
Serum Cortisol	1400 nmol/L	140 to 700
Serum ACTH	18 pM/L	< 15.6
Serum CRH	below normal	---

Which of the following glands is most likely the original source of the problem?

Question 6 options:

1)	hypothalamus

2)	anterior pituitary

3)	adrenal cortex

4)	thyroid gland

5)	it's impossible to say