All information on ovulation

At a glance

An ovulation test (also known as an LH test ) can be used to determine the time of ovulation. Since this also means that the fertilizing days of the month are known, this knowledge can be used to fulfill a desire to have a child.

The application is relatively simple, as only one test strip has to be dipped in urine. The result can then be read on the test strip.

For more information

The ovulation test measures the hormone concentration of the LH hormone in the urine. The test responds to the increase in LH in the urine. LH is the abbreviation for “luteinizing hormone”. This hormone is produced in the pituitary gland and causes the ovulation. It has its name from the Latin luteus, which can be translated as “orange yellow”, since it is also responsible for the formation of yellow bodies. The LH hormone triggers the release of the ripe egg cell from the ovary. The messenger substance is an absolute indicator to know early and in advance when ovulation will take place. Approximately 24-36 hours before ovulation, the LH concentration in the urine increases from 5-20 mIU/ml to 25-40 mIU/ml – an accurate and clearly measurable sign of the approaching ovulation. This makes it relatively easy to determine ovulation. The increase in the luteinizing hormone usually occurs in the second half of the night.

Positive or negative – the test is not always clear. Diseases and medications, individually different LH levels as well as the sensitivity of the respective test system influence the result. Individual LH concentrations in combination with the different sensitivity of the ovulation test used can be the cause that the test works well for one woman and for the other not.


  • Wendler, N. (2017): Ovulationstest, URL: https://www.netdoktor.de/kinderwunsch/ovulationstest/, Retrieved 18.06.2019
  • Bouchard, T.P. & Genuis S.J. (2011): Personal fertility monitors for contraception. CMAJ 183(1):73-76
  • Raith-Paula, E. et al. (2013): Natürliche Familienplanung heute. Modernes Zykluswissen für Beratung und Anwendung. 5. Auflage. Springer Verlag
  • Robinson, J.E., et al. (2007): Increased pregnancy rate with use of the Clearblue Easy Fertility Monitor. Fertility and Sterility 87:329-334
Status of information: 2022