Why you might see this term
It can help with timing when used according to the manufacturer’s instructions. Test lines and reading windows vary by product.
What to keep in mind
An LH surge is not proof of ovulation. PCOS, some medicines and repeated surges can make results harder to interpret.
Sources & further reading
Prepared by ProFertility · Updated 23 October 2026.
Educational information based on the linked sources. This explanation is not an individual diagnosis or a treatment recommendation. A term appearing here does not mean the test is necessary or included in a particular kit.
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