How do ovulation tests (or Ovulation Predictor Kits, OPK) work?
The ovulation predictor kit is designed to detect luteinizing hormone, or LH. In elevated quantities, LH causes ovulation. During the menstrual cycle only a small amount of LH is made, but in the middle of the cycle LH briefly and dramatically increases. This increase is called the “LH surge” and precedes ovulation. Conception is most likely to occur within thirty-six hours following the LH surge. Our ovulation tests are specifically designed to detect your LH surge – the time when you are likely to ovulate, the best time to conceive a baby.
