Ovulation prediction kits detect the surge in luteinising hormone (LH) just before ovulation. They’re easier to use and often more accurate than the BBT method and they can predict ovulation 24 to 36 hours in advance and help you maximise your chance of conception from the first month you use them.
The kits are not foolproof. They can measure LH, but they cannot indicate whether you ovulate after a positive response; LH can surge with or without the release of an egg. False LH surges can also take place before the real one.
For maximum accuracy, follow the kit’s directions to the letter. If you have a 28-day cycle, start the test on day 11 and use it for 6 days. If your cycle is longer, start on day 14 for 9 days. If your cycle runs between 28 and 40 days, ovulation may range between days 14 and 26. The kits generally provide 5 to 9 days’ worth of tests.
