Ovulation prediction kits measure a hormone in the female body called luteinizing hormone or LH. According to Megan Clarke of PeeOnAStick.com, LH surges 12 to 36 hours before an ovary will eject an egg during ovulation. Using the kits can help couples time intercourse to help sperm meet the egg. The American College of Obstetricians and Gynecologists state in "Your Pregnancy & Birth" that an egg survives for fewer than 24 hours once it is released. It must be fertilized before it dies. Ovulation predictor kits assist in determining when ovulation will occur; however, the results can be confusing to interpret.
Things You'll Need
- Answer brand Ovulation Predictor Kit
- Timer or stopwatch
Set your timer to return to read the test. It may take several minutes for the LH to react with the antibody strip to give a result. The test must be read within the timeframe specified in the instructions for the results to be valid. According to Megan Clarke, the Answer dip-sticks must be read within eight minutes. The mid-stream test may be read for up to one hour.
Locate the control line, which was the first line that developed after urine was applied to the stick. It will be on the right side of the window furthest away from the wick.
Locate the test line, which was the slower-developing line that appeared after urine was applied to the stick. It will be on the left side: the side the urine wick is on.
Assess the darkness of the two lines. If the test line is as dark or darker than the control line, that is considered a positive test and you will ovulate within 36 hours. If the test line is lighter than the control line, impending ovulation has not been detected yet or it may have already occurred. If the test line is half dark and half light, test again in a few hours or contact customer support to determine if a half-positive line is a positive or negative result.
Tips & Warnings
- If you have an almost-positive test early in the day, test again with a second kit a few hours later and you will likely catch the beginning of your LH surge and be able to confirm it.
- Tests done with first-morning urine may be inaccurate because LH metabolizes into urine in the early hours of the morning. Take the test mid-morning or later.
- Do not reuse ovulation predictor kits, even if the last result was negative. The antibody strip that reacts to the urine will no longer be functional.
- PeeOnAStick.com: OPK FAQ
- "Your Pregnancy & Birth"; The American College of Obstetricians and Gynecologists; 2005
Post Ovulation Symptoms
Some relatively accurate ways exist to determine if you have ovulated. These include changes that occur after ovulation has occurred, such as...
How Can Pregnancy Affect Ovulation Tests?
If you are using ovulation tests to predict ovulation, pregnancy can affect the results of your tests. Because of the similarity in...
How to Read an Equate Pregnancy Test
The Equate Pregnancy Test is works like most other home pregnancy urine tests. When testing, you'll hold a plastic stick in your...
How to Use an Ovulation Kit
If you are trying to get pregnant, you may want to use an ovulation kit to determine when you are your most...