17α- Hydroxyprogesterone ( 17α-Hydroxyprogesterone , 17α-OHP ) , sometimes abbreviated as hydroxyprogesterone ( OHP ) is an endogenous progesterone – like steroid hormone, but also a precursor for the biosynthesis of many endogenous steroid hormones , including androgens , estrogens , glucocorticoids, and mineralocorticoids, as well as some neurosteroids .