FAQ Ovulation Test Kits-Using Ovulation Test Strips

Below is a selection of the most frequently asked questions about using ovulation test strips

Ovulation test strips ALL Test

We are here to help if you need us. If you do not see the answer to your question here, then e-mail or telephone us, and we will endeavour to answer it for you.

What is an ovulation predictor test kit & how does it detect the most fertile time?

An ovulation predictor test kit gives you advance notice that you are going to ovulate by measuring a hormone in your urine called Luteinising hormone ( LH for short ) This hormone is released & peaks just prior to ovulation and is the trigger to the ovary to release the egg. By identifying this peak in the levels of LH each month also known as the LH surge we can identify the most fertile time in a women’s cycle.
You can see our full range of ovulation prediction test kits & ovulation tests available to buy online.

How do ovulation kits work?

Ovulation kits work by detecting the female hormone, luteinising hormone, often abbreviated to LH. The test kit has a chemical embedded into it, which reacts with LH. This shows as a line on the LH test. The darker the line, the more hormone that has been detected. The test will also have a control line. The ovulation test is regarded as positive when the test line is as dark or darker than the control line.

When do I start testing with urine LH ovulation test strips?

For most urine ovulation test kits it depends on the length of your cycle:
When to start testing
Determine the length of your menstrual cycle. Your menstrual cycle length is the number of days from the first day of your period (menstrual bleeding) to the last day before your next period starts. Think back over the last few months to decide what your usual cycle length has been.
Circle your usual cycle length on the WHEN TO START CHART below. Select the number directly underneath. Starting the first day of your last period, count ahead of the selected number of days on your calendar. This is the day you should begin testing.
When to start chart
Circle your usual cycle length.Cycle 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Start 06 06 07 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23Example, if your cycle length is 26 days start testing on day 9. (Where day one is the first day of your last period).Note: If you are unsure about your cycle length, or your cycles are irregular, you may want to use your shortest cycle length when reading the chart. If you do this, you may need to test for more than 5 days.
You can buy LH home ovulation test kits through this website.

When’s the best time of day to take an ovulation test?

The best time to collect a urine sample for ovulation testing is usually early to mid-afternoon, ideally between 2 pm and 2.30pm. This is because studies have shown that the hormone that you are measuring LH, is at its highest levels at this time of day, in most women. If you tested first thing in the morning, it is likely you would miss your LH surge, as the hormone is very low first thing in the morning.

Why do I need to restrict my fluid before I collect my urine sample for my LH test?

You will need to restrict your fluid intake for about 2 hours before you collect your urine sample for your LH ovulation test. This is because if the urine sample is too dilute you may miss the LH surge, and therefore you would miss the 1st day of your most fertile period.

How do you use ovulation test sticks 

To use an ovulation test strip you simply collect your urine sample at the correct time of day, usually early to mid-afternoon for most women and then you dip the urine test strip into the urine sample for a few seconds and then lay it flat. You will see the urine running along the strip, and you should see a Control or C line appear. This means that the test has absorbed enough urine. You then wait the required time as specified in the instructions for the test that you are using, usually a few minutes, and then you look for a Test or T line to develop. To be positive the T line must be the same as, or darker than the C line.

Ovulation test strips-how to read results

Ovulation test sticks or strips are very simple and easy to use. They screen urine for a hormone called LH or Luteinising hormone, that increases rapidly just before ovulation, and is the hormone that triggers the release of the egg from the ovary. This hormone can be detected in your urine. The LH tests work by identifying when this hormone is above a certain level that is required to stimulate ovulation. This high level is known as the LH surge 

How long do the results take to appear on my ovulation test strip?

You can usually read the results on most ovulation test kits within about 10 minutes. Read the instructions for the test kit that you have purchased, as they may vary a little from brand to brand. A positive result will not disappear, but some negative results may later turn positive if left for longer than the specified time in the instructions. If this happens this is not a positive result. It is best to discard the ovulation test kit once you have read the result so you will not be tempted to look at it again.

What does no LH surge mean?

The first thing to say is don’t panic.
There are several possible explanations for not detecting the LH surge:
• LH surge may be too mild to be detected by the LH tests that you are using. It may be worth trying a lower sensitivity LH test.
• Your urine sample may have been too diluted. Make sure you restrict your fluid intake for about 2 hours before you take the test
• You may have tested at the wrong time of day and missed the LH surge. The ideal time to test is early to mid-afternoon.
• The test strip may not have absorbed enough urine. Make sure that the control line is visible. This shows that sufficient urine has been absorbed, for the test to run. if the control line is not showing dip the strip into the urine sample again.
• The LH test that you are using may be faulty. Make sure that you buy from a reputable supplier, and that the tests are in date and have been stored correctly.
• You may be testing at the wrong time of your cycle. For women who have irregular periods, knowing when to test can be very difficult.
• You may not have used the test correctly. Make sure that you read the instructions before starting the test and use a timer.
• You may not be going to ovulate this month. This may just be a one-off, but if it happens repeatedly you should see your doctor, as it may mean that you are not ovulating and need further investigations.
• You may already be pregnant. There is always a small possibility that you may already be pregnant. If your last period was different to usual, or very light it may be worth doing a pregnancy test.

Why do I ovulate late in my cycle?

The length of a women’s menstrual cycle varies from women to women. Ovulation occurs 14 days before your period. If you cycle is 28 days this means that you would ovulate around day 14. If your cycle is 30 days long you will ovulate around day 16. Ovulation occurring after day 21 of the cycle, is regarded by the medical profession as late ovulation. There are many possible causes for this:
• hormones
• illness
• stress
• general health issues
• over exercising
• weight too high or too low
• genetic problem
• ovarian problem. If the late ovulation is a one-off, then is probably caused by stress either physical or psychological. However, if ovulation is late often this can make it more difficult to conceive and may need further investigations. Talk to your doctor if you are experiencing late ovulation or erratic cycles regularly.

What to do if not ovulating?

If you think that you are not ovulating, then you should talk to your doctor as you may have an ovulatory disorder ie ovulation is not occurring at all, or occurring only very occasionally. The good news is that ovulatory disorders are treatable. Clues that you may have an ovulatory disorder are very irregular or erratic cycles.

How accurate are ovulation test strips?

Urine ovulation tests detect the LH surge that is the trigger to ovulation occurring. Ovulation usually occurs 1-2 days after this. When used correctly LH tests are approximately 99% accurate at detecting this LH surge. However this does not guarantee that ovulation will occur, it just shows that the LH surge has occurred. It is possible to have an LH surge and yet still not ovulate. In this case, there is usually a problem with the ovaries that is preventing the release of the egg.

What does a prolonged LH surge mean?

Normally the LH surge last about 2-3 days. If it is regularly longer than 3 days then there are several possible causes to consider:
• Anovulation
• Approaching menopause.
• Another possible cause of a prolonged LH surge is an early pregnancy.
• It is also worth noting that if you are using ultra-sensitive 20mIU ovulation tests then the LH surge may be detected for longer than if you are using the 40mIU LH tests

How long after having a coil IUCD removed will I detect an LH surge?

Most coils now contain a hormone that means there may be a delay in ovulation and in the periods restarting. This is very variable and may take several months and when the period do restart, the cycle may be very erratic, to begin with. This can make it difficult to use ovulation tests in the immediate months following removal of the IUCD (coil). In some cases, the periods do not restart and you may just find that you are pregnant.

The control line on my LH ovulation test strip is faint. Does this matter?

The colour of the control line can vary from batch to batch, and from brand to brand and also on the time of day that you test and the dilution of the urine. As long as the test line is as dark or darker than the control line the result is positive. To ensure the result is optimum try to always test at the same time of day, and restrict your fluid intake for 2 hours before testing. The best time of day to test is early to mid-afternoon, ideally, between 2 pm and 2.30pm If you test at other times, you may completely miss the LH surge. If you are unsure how to interpret your result please e-mail us a photograph and your order number so we can advise you.

What are professional ovulation tests?

Professional ovulation prediction tests include cassette kits, ovulation tests strips & ultra sensitive ovulation tests that are available in bulk packs. They are cheap yet highly accurate ovulation test strips from ALLTEST & Instalert.
We also have an extensive range of professional pregnancy tests in strip, cassette and midstream formats that can be ordered in for fertility clinics, healthcare professionals, fertility practitioners & NHS at great value for money prices.
Contact us for Professional & NHS ovulation & pregnancy tests.

Do ovulation tests work if you’re pregnant?

During pregnancy, you may still get a positive ovulation test. This is because LH is still released during early pregnancy and in fact, the pregnancy hormone beta HCG is very similar to LH hormone. During late pregnancy LH hormone is inactive. Pregnancy can be a cause of a prolonged LH surge. If you think you may be pregnant this should be confirmed with an hcg pregnancy test strip.

Will my ovulation test be negative if I’m pregnant?

Not necessarily. As discussed above you can get LH released during early pregnancy, and the pregnancy hormone may sometimes give false positive on an LH test as the two hormones are very similar. If in doubt do a pregnancy test