Abstract
InhB is a dimeric protein secreted by granulosa cells. Its concentration rises at two points in the follicular phase, corresponding to preantral follicular growth and rising follicle-stimulation hormone (FSH). Despite its relationship with folliculogenesis, inhB has shown inter-cycle variability and cross-reactivity with other proteins, making it an inaccurate marker of ovarian reserve or predictor of oocyte yield. However, a new ELISA that specifically measures the βB and α units detects the true biologically active, or bioavailable, inhB (bio-inhB).
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