OPK stands for ovulation predictor kit. These kits can be found at most pharmacies and on our products page. OPK’s work by measuring the presence of Luteinizing Hormone (LH) detected in your urine. A surge of LH is an indication that ovulation is expected to occur within 24 hours. An OPK is positive the day before you ovulate. Carefully read all instructions that come with your kit.
Modified on: Fri, Feb 6, 2015 at 4:29 PM
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