LH (luteinising hormone)
A hormone that triggers ovulation and supports the corpus luteum's production of progesterone.
In plain English
It's the hormone whose natural surge normally triggers ovulation, and it's monitored and controlled throughout IVF stimulation.
Why it matters
Controlling LH activity is exactly what agonist and antagonist drugs are for, preventing you from ovulating before egg collection.
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.