Lab marker · High

High Inhibin B: what it means

A Inhibin B result above the normal range is considered high. Here is what a raised Inhibin B can point to, and when it is worth discussing with a doctor.

Reference range: highly cycle- and sex-dependent (no single normal range); in women reflects ovarian reserve, in men reflects sperm-producing (Sertoli-cell) function — always interpreted with FSH and AMH

Understand your full result

What a high Inhibin B can mean

  • A granulosa cell tumour of the ovary — these can secrete inhibin B, which is used as a tumour marker to monitor them.
  • A good pool of growing follicles — in the fertility context, a higher level reflects better ovarian reserve.
  • Active testicular function in men — a healthy level supports normal sperm production.

When to discuss with a doctor

Inhibin B is a specialist fertility and reproductive test rather than a routine one. In women, it is used as part of assessing ovarian reserve during a fertility work-up, always alongside FSH and usually AMH, which together give a fuller picture than any single value. In men, a low inhibin B with a raised FSH supports impaired sperm production. It is also followed as a tumour marker in granulosa cell tumours of the ovary. Because inhibin B swings widely with cycle phase, age and sex, one value in isolation means little. Mediora.AI shows inhibin B alongside FSH, AMH and estradiol so the ovarian-reserve or testicular pattern reads together; the interpretation belongs with your gynaecologist or fertility specialist.

Keep reading

One value is a snapshot. Upload the full test to see every marker explained together.

Upload your test - free

Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.