Most ovulation monitors detect luteinizing hormone (LH) in urine; some digital tests also track the estrogen metabolite E3G. An LH surge in urine usually signals that ovulation is likely to occur within about 24–48 hours, identifying your most fertile days.
Timing varies by product: some tests report results in about 3 minutes, while most strip-style tests show results in about 5 minutes.
This selection includes disposable testing strips and fully digital ovulation monitors that display results on a screen.
On strip-style tests a positive (LH surge) is usually shown when the test line is as dark as or darker than the control line. Some strips also use a color or indicator line to signal results.
Some tests in the selection report an LH detection sensitivity of 25 mIU/mL for identifying the surge.
Digital monitors typically use icons or messages to indicate fertility levels—for example: no/low fertility (blank or low icon), high fertility (flashing icon), and peak fertility (steady icon).
Reviewers commonly describe these tests as simple to use, with clear, easy-to-read results and straightforward instructions.
