The DHEA-S test measures the level of dehydroepiandrosterone sulfate (DHEA-S), a hormone produced by the adrenal glands that serves as a precursor to both testosterone and estrogen. DHEA-S plays a critical role in various bodily functions, including immune response, energy production, and mood regulation. Abnormal levels of DHEA-S can indicate adrenal insufficiency or other hormonal imbalances, leading to symptoms like fatigue, low libido, and mood fluctuations. This test is particularly valuable for individuals seeking to understand their hormonal health and manage symptoms related to adrenal or reproductive hormone levels.