The Sex Hormone Binding Globulin (SHBG) test is a blood test used to measure the level of SHBG, a protein produced by the liver that binds to sex hormones such as testosterone and estrogen.
SHBG regulates the availability of these hormones in the body by controlling how much is free and active. Abnormal SHBG levels can affect hormone balance and may be associated with conditions such as polycystic ovary syndrome (PCOS), infertility, thyroid disorders, and liver disease.
This test is often performed along with other hormone tests to evaluate hormonal imbalances, reproductive health, and endocrine disorders in both men and women.