LH Surge

An LH surge is a rapid increase of the luteinizing hormone (LH) in a woman's bloodstream that occurs 24-48 hours prior to ovulation. As a result, the LH surge can be used to time sexual intercourse for the days prior to ovulation to increase the likelihood of conception.

At-home ovulation predictor kits (OPKS) measure LH levels in urine and can identify when the surge has occurred.

LH surge is also called a luteinizing hormone surge.