Ovulation prediction test
An ovulation prediction test generally detects the presence of luteinizing hormone (LH) in the urine. While this hormone is present in small quantities during most of the menstrual cycle, LH levels surge a few days before ovulation. Ovulation is the most fertile period of the menstrual cycle and the most favourable time for conception.
| What is the purpose of this test? | This test is performed to more accurately predict when ovulation will occur. |
| How to prepare? | Here are some tips to follow:
|
| Possible results |
|
| Associated tests | Pregnancy test |
| How long before I get the results? | The test usually takes 5 minutes to complete, and the results are ready quickly. |
How is it done?
- This test requires a urine sample.
- You should begin testing 3 to 5 days before the expected date of ovulation. If you aren't sure when this is, you can do a simple calculation based on the length of your menstrual cycle.
- The menstrual cycle begins on the first day of menstruation, and ovulation occurs 14 days before the start of menstruation. So, for a 28-day menstrual cycle, the estimated date of ovulation would be day 14. In this example, testing should be started on day 11, that is, the 11th day after the start of menstruation.
- If your cycle is shorter, you will need to start testing earlier. Likewise, if your cycle is longer, you will need to start testing later.
- Test kits typically contain 5 to 7 tests, as it is often necessary to test for several days to detect a surge in LH. As a general rule, you should only do one test per day.
- Ovulation prediction test kits sold at the pharmacy all have different instructions. It's essential to carefully read and follow the instructions for the test you choose.
What do the results mean?
Positive result
A positive result indicates that sufficient LH has been detected in the urine sample. This means that ovulation should occur within the next 24 to 36 hours.
Negative result
A negative result indicates an absence of LH in the urine or an amount too small for the test to detect. The test should be repeated on subsequent days until an increase in LH is detected.
Factors that may affect test results
- Certain fertility drugs
- Ovulatory dysfunction disorders (such as polycystic ovary syndrome)
- Current or recent pregnancy
- Excessively diluted urine
- Expired tests
- Test-handling errors
© Copyright Vigilance Santé
The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.