Ovulation Predictor Kits–Don’t Miss Your 2 Best Days to Conceive!






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1. What Is An OPK?

Today’s technology has come such a long way. There is no a tool for just about every aspect of our lives. This is especially true for trying to conceive. Where a woman would have to manually chart her menstrual cycles on a calendar, or learn to keep track of their cervical mucus to figure out when she was most fertile.


However, today, women can use smartphone apps, online software programs, and over the counter ovulation predictor kits to track their ovulation. Ovulation Predictor Kits, or OPKS, are at home tests that women can use to determine when their most fertile days are.

2. How Do OPK’s Work?

Most OPK’s work similarly to at home pregnancy tests. Women use a test strip to either place in the midstream of urine or dip into a test cup of urine. After waiting an allotted amount of time, the test strip will turn a certain color. There will be a control band to match the color of the test strip to. When you see that the test band is the same color or darker than the control band, that means that the test has detected a surge of LH in your body.


LH is the hormone that surges prior to ovulation, so when the test strip is the same color or darker than the control band, it means that the LH surge has been detected, and the woman will most likely ovulate within 36 hours.

3. How Accurate Are OPK’s?

Much like at home pregnancy tests, ovulation predictor kits are very accurate if used correctly. Most ovulation test can be used at any time of day. However, one important thing to remember is that the LH surge happens quite quickly in many women, so it can be easy to miss it if you are not diligent.


It is best to test once per day, although some women like to test once in the mornings and once at night just to be sure. The LH surge is something that happens very clearly, so it is pretty easy for OPK tests to detect it. However, you should still make sure to follow the instructions accurately and completely for the best results.

If you have been diligent about taking your ovulation predictor kit test every day for several months and you do not notice an LH surge at all, it could be that you are not ovulating properly. It is very important to see your doctor if this happens so you can be sure that something serious is not going on. Ask your doctor or a trusted health care provider if you have any questions.

Dr. Karen Leham is double board-certified in Obstetrics and Gynecology and in Reproductive Endocronology and Infertility. Dr. Leham completed her residency at Loyola University, followed by a fellowship at UCLA.