DHEAS stands for dehydroepiandrosterone sulfate, a hormone produced by the adrenal glands. It is often measured in blood tests to evaluate adrenal function and diagnose conditions such as adrenal insufficiency or polycystic ovary syndrome. The test is typically performed on a blood sample drawn from a vein in the arm and results are usually available within a few days. Abnormal DHEAS levels may require further testing and evaluation by a healthcare provider.