A sudden surge in the level of LH, a hormone, causes ovulation. LH is always present in the body but in smaller amounts than are seen just prior to ovulation. The release of LH matures the egg and weakens the wall of the follicle in the ovary. This process leads to ovulation: the release of the now mature ovum. The LH surge can last from 1-3 days. Most people will ovulate 12-48 hours after the LH surge is detected; most common is 36 hours after the actual surge. The surge in LH can usually be detected in the urine 8-12 hours after it occurs in the blood.
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DNA & Genetics
DNA & Paternity
