Prolactin
A hormone produced by the pituitary gland that can, when raised, interfere with ovulation.
In plain English
It's a hormone that's usually checked by blood test because high levels can disrupt regular ovulation.
Why it matters
If it's raised, it's usually treatable, and addressing it can restore more regular cycles before or during fertility treatment.
Related terms
Guides that cover this
Written by patients, not clinicians. This page has not yet been reviewed by a named fertility professional, so it explains published guidance and points you to the original source instead of giving medical advice. It is not medical advice. Decisions about your treatment belong with your own clinic. Read our editorial policy and corrections policy.