Ovulationstests

Ovulationstests are fertility aids designed to detect the luteinizing hormone (LH) surge in urine. The LH surge occurs roughly 24 to 36 hours before ovulation, making these tests a way to identify the beginning of the fertile window for intercourse when trying to conceive. Most tests are urine-based and come as strips, midstream sticks, or digital readers. Digital tests typically show a peak or fertility symbol when LH is rising; line-based tests show a second line that matches or exceeds the control line.

Most products require testing once daily for several days preceding the anticipated ovulation, which depends on cycle length. It is usually recommended to test at about the same time each day and to follow the instructions regarding fluid intake and the best time of day for testing. Some users start testing when their cycles begin to vary or when cycles are irregular. After a positive result, the fertile window is considered to extend for about the next one to two days.

Interpreting results: a positive test indicates that an LH surge has been detected and ovulation is likely within 24 to 36 hours; a negative test indicates no surge detected at that time. LH surges can be brief and may be missed if testing is infrequent. A negative result does not guarantee lack of fertility, and a positive result does not confirm that ovulation has occurred.

Limitations include variability from medications, certain medical conditions such as polycystic ovary syndrome (PCOS), menopause, or perimenopause, and the fact that these tests predict but do not confirm ovulation. They are not a contraception method.