ACTH Stimulation Test
ACTH Stimulation Test checks how the adrenal glands respond to a certain hormone. The
hormone is called adrenocorticotrophic hormone, also known as ACTH. ACTH is made in the
pituitary gland and travels through the bloodstream to the adrenal glands. ACTH stimulates
the adrenal gland to release cortisol.
Why is the CTH Stimulation Test Performed?
This test is helpful in determining if the adrenal and pituitary glands are normal. It
is most often used when adrenal gland disorders, such as Addison's disease or pituitary
insufficiency, are suspected.
How is the ACTH Stimulation Test Performed?
Cortisol levels in the bloodstream are measured before and after an injection of ACTH
into the blood or muscle. A blood sample is taken from a vein on the forearm or hand.
First, the skin over the vein is cleaned with an antiseptic. Next, a strong rubber tube,
called a tourniquet, is wrapped around the upper arm. This enlarges the veins in the lower
arm by restricting blood flow through them. A fine needle is inserted into a vein, and the
tourniquet is removed. Blood flows from the vein through the needle and is collected in a
syringe or vial for testing in the laboratory. After the needle is withdrawn, the puncture
site is covered for a short time to prevent bleeding.
ACTH Blood Test |