A cortisol level is a blood test that measures the amount of cortisol, a steroid hormone produced by the adrenal cortex.
Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.
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