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Clearblue Digital Ovulation Test - FAQs

I don’t know my cycle length or my cycle length varies. How do I know when to take my ovulation test?

If you don’t know your usual cycle length, it is best to wait for at least one menstrual cycle and make a note of this cycle length. Then use the instructions provided or watch our how to use video to work out when to start testing.

If your cycle length varies by more than 3 days choose the shortest cycle you have had over the last 6 months to work out when to start testing.

If you want to start testing without knowing your cycle length, we recommend you start testing on day 10. Please bear in mind that you might miss your LH surge because you have tested too late in your cycle.

What is the best time of day to take my ovulation test?

You can take your test at any time of the day, but you should test at approximately the same time each day and make sure you haven’t urinated for at least 4 hours before testing.

Do I need to use all the ovulation tests in the box?

The good news is you can stop testing once you have detectd your LH surge.

Can I use my test holder with any other test sticks?

You can only use the Clearblue Digital Ovulation Test Sticks with your test holder. If you have test sticks left from a previous Clearblue Digital Ovulation Test pack you can use the test holder in this pack with them.

How accurate is the Clearblue Digital Ovulation Test?

In laboratory trials the Clearblue Digital Ovulation Test has been show to be over 99% accurate in detecting the LH surge before ovulation. The test detects LH at a concentration of 40mlU/ml or greater.

I have used all the tests in my pack and followed the instruction but have detected my LH surge. What should I do?

The number of tests in your pack is usually enough for most women with regular cycles to detect their LH surge. However, if your cycle length varies by more than 3 days then you may need some more tests. Some women don’t ovulate every cycle and therefore won’t see an LH surge each cycle. If you have any concerns about your test results please see your doctor.

Can any medical conditions for medication affect my results?

Please always read the information leaflet before taking the test.

Some medical conditions can affect your test for example, if you are actually pregnant, have recently been pregnant, have reached the menopause or have polycystic ovarian syndrome you may get a misleading result.


Some medications can affect your results, for example fertility drugs containing Luteinising Hormone or human Chorionic Gonadotrophin. Clomiphene citrate does not affect your tests, but may affect the length of your cycle and, therefore, when you should be testing. If you have any concerns speak to your doctor.

I have recently stopped using the contraceptive pill or another type of hormonal contraception, will this affect my test results?

No this won’t affect your test results. However, your natural hormone pattern may take some time to stabilise and your cycles could be irregular for a while. You might want to wait until you have had two natural menstrual cycles and note the length of these cycles before using you Clearblue Digital Ovulation Tests.

I’ve used Clearblue Digital Ovulation Test for several months and haven’t become pregnant. What should I do?

 It can take months to become pregnant. There are many reasons why you may not become pregnant even if you’ve been able to have sex at your most fertile time. If after several months you’ve had no success, you should consult your doctor.

Last updated: 23.07.2018