16α-Hydroxydehydroepiandrosterone sulfate (16α-OH-DHEA-S), also known as 16α-hydroxy-17-oxoandrost-5-en-3β-yl sulfate, is an endogenous, naturally occurring steroid and a metabolic intermediate in the production of estriol from dehydroepiandrosterone (DHEA) during pregnancy. It is the C3β sulfate ester of 16α-hydroxy-DHEA.