Ovulation prediction tests detect the presence of luteinizing hormone. This hormone is present in small amounts during most of the menstrual cycle but rises a few days before ovulation.
Testing should start 2 to 4 days before the estimated date of ovulation. If the date is unknown, it can be calculated - in approximate terms - based on the length of the menstrual cycle. Knowing that a cycle starts with the first day of your menstrual period and that ovulation occurs 14 days before the start of your menstrual period, calculating the date is relatively simple. For example, for those with a 28-day menstrual cycle, the ovulation date is estimated to be on day-14 and tests should therefore start on day-11 of the cycle. If the cycle is shorter, tests should start earlier and, if the cycle is longer, tests should start later.
If results are positive
Ovulation will occur within the next 12 to 36 hours.
Certain factors can cause inaccurate results. They include:
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