11β-Hydroxyandrostenedione
11β-Hydroxyandrostenedione, also known as 11β-hydroxyandrost-4-ene-3,17-dione, is an endogenous, naturally occurring steroid and androgen prohormone that is produced primarily, if not exclusively, in the adrenal glands. It is closely related to adrenosterone, 11-ketotestosterone, and 11-ketodihydrotestosterone, which are also produced in the adrenal glands.
It can be used as a biomarker for guiding primary aldosteronism subtyping in adrenal vein sampling where blood samples are taken from both adrenal glands to compare the amount of hormone made by each gland.