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For women still having a period the testing should be done between Day 20 - Day 24 of your cycle (Day 21 being optimal). Day one starts with the first day of your last period.

LH blood test measures the amount of luteinizing hormone (LH) in the blood stream. This test may be performed when a disorder associated with abnormal levels of LH is suspected. LH is a protein hormone secreted by the anterior pituitary gland.

In women, an LH surge at mid-cycle causes ovulation. For the next week or so, LH maintains the corpus luteum which synthesizes progesterone. If a woman does not become pregnant, the corpus luteum disintegrates after about 10 days. In men, LH stimulates production of testosterone by the Leydig cells of the testes.

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