ovulation predictor kit

Most ovulation predictor kits detect luteinizing hormone (LH) in urine. Some kits also measure estrogen metabolites (often labeled E3G) alongside LH to provide additional information about your fertile window.

Results typically appear within about 3–5 minutes. Exact read times vary by brand, so follow the kit’s instructions for the correct window to read the result.

Ovulation predictor kits use a urine sample to detect fertility hormones such as luteinizing hormone (LH).

Ovulation typically occurs about 24–48 hours after an LH surge; many sources narrow that to roughly 24–36 hours after a positive test.

Several kits offer companion fertility-tracker apps that accept test photos or scans, log cycle data, and chart LH progression to help predict fertile windows.

Afternoon testing is often recommended; testing is generally acceptable from about 10 a.m. through the early evening. Follow the kit’s instructions for the manufacturer’s recommended testing time.