Serum cortisol analysis (Cortisol Serum) is a test used to measure levels of the hormone cortisol in the blood, a hormone produced by the adrenal glands. Cortisol plays a vital role in regulating a variety of biological processes, including the body’s response to stress, control of blood sugar levels, and regulation of metabolism. A blood sample is usually collected in the morning, when cortisol levels are at their highest, and then sent to the laboratory for analysis. This test is considered an important tool for diagnosing conditions such as Cushing’s syndrome, in which cortisol levels are abnormally high, or adrenal insufficiency, in which levels are low. Due to its accuracy, serum cortisol analysis can provide valuable insights into adrenal gland health and the body’s response to stress.