Q: Why is the OPK test positive for so long?
A: An ovulation predictor kit (OPK) tests the hormone LH, which rises shortly before ovulation. If your OPK tests positive for more than 2-3 days there may be an abnormal prolonged increase in your LH hormone. This is not considered normal, and you may want to get checked by your doctor. A prolonged rise of the LH hormone could happen under the following circumstances: