Hormones

A hormone is any member of a class of signaling molecules, produced by glands in multicellular organisms, that are transported by the circulatory system to target distant organs to regulate physiology and behavior. 

Aldosterone in Blood

An aldosterone test measures the level of aldosterone (a hormone made by the adrenal glands ), in the blood. Aldosterone helps regulate sodium and potassium levels in the body. This helps control blood pressure and the balance of fluids and electrolytes in the blood. The kidney hormone renin normally stimulates the…

Aldosterone in Urine

An aldosterone test measures the level of aldosterone (a hormone made by the adrenal glands ) in the urine. Aldosterone helps regulate sodium and potassium levels in the body. This helps control blood pressure and the balance of fluids and electrolytes in the blood. The kidney hormone renin normally stimulates the…

Amylase

An amylase test measures the amount of this enzyme in a sample of blood taken from a vein or in a sample of urine. Normally, only low levels of amylase are found in the blood or urine. But if the pancreas or salivary glands become damaged or blocked, more amylase is usually released into the blood and urine. In the…

Anabolic Steroids

What are anabolic steroids? Anabolic steroids are synthetic substances similar to the male hormone testosterone. Doctors prescribe them to treat problems such as delayed puberty and other medical problems that cause the body to make very low amounts of testosterone. Steroids make muscles bigger and bones stronger. They…

Antithyroid Antibody Tests

Thyroid antibody tests measure the levels of antibodies that can destroy thyroid tissue or make the cells produce thyroid hormones. They are blood tests. Antibodies that destroy thyroid tissue can lead to hypothyroidism (underactive thyroid). Antibodies that make the cells produce thyroid hormone can lead to…