Serum/plasma concentration of a substance related to metabolic or endocrine function (e.g., cortisol, aldosterone, or similar steroid hormone)

What This Test Measures

This test detects the concentration of a specific substance in your serum or plasma. The substance could be a hormone (like cortisol or aldosterone), a metabolic byproduct, or another biologically active compound. The method used may include immunoassay or similar techniques to quantify the substance accurately.

Why It Matters in Your Health

Blood levels of this substance can provide insights into how your body produces, regulates, or processes it. For example, it may help diagnose conditions related to hormone imbalances, kidney function, or other metabolic disorders.

Common Uses

This test is often ordered to evaluate conditions such as adrenal insufficiency, Cushing’s syndrome, or other endocrine or metabolic disorders. It may also be used in research or specialized clinical settings to monitor specific physiological pathways.

Sample Collection and Preparation

A blood sample is typically drawn from a vein in your arm. The blood is processed to separate serum or plasma, which is then sent to the lab for testing. You may be asked to fast or avoid certain foods before the test, depending on the specific substance being measured.