Monitor your response to ovarian stimulation.
Predict the timing of ovulation.
If you’re not getting your period, or if you’re having irregular menstrual cycles, you may want to have your LH and other hormones checked, to look for potential problems.
When Should I Have My LH Levels Checked?
You should have your LH level checked at the beginning of the cycle — classically Day 3 — along with your FSH, to evaluate for ovarian function.
More commonly, the LH level should be checked midway through your cycle — Day 14 of a 28-day cycle. This is because the LH surge triggers ovulation.
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