Ovulation Test FAQ

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Ovulation Tests - or Ovulation Predictor Kits - allow you to predict, with great accuracy, your most fertile time of the month. Easy to use, OPKs can greatly increase your chances of becoming pregnant - if you use them correctly. Let our Ovulation Test FAQ help you enhance your predictive success!

(Editor's Note: Join our online community to discuss ovulation testing, or click here to purchase ovulation tests with free shipping.)

If used correctly, ovulation tests are excellent predictors of ovulation. However, in order to detect the LH surge with accuracy, directions must be followed exactly. The most common mistake made with OPKs is generalizing the methods of pregnancy testing to ovulation testing - which leads to errors in use and in the interpretation of results. To get the most out of ovulation testing, read our Ovulation Test FAQ.

Ovulation Test FAQ

Q: How do ovulation tests work?

ovulation test FAQ Ovulation tests detect luteinizing hormone (LH). Just prior to ovulation, women experience a brief surge in luteinizing hormone. Ovulation predictor kits help you pinpoint this surge and anticipate ovulation - your most fertile period in your cycle. Luteinizing hormone, in elevated amounts, is actually the hormone that causes you to ovulate (when the eggs bursts from the ovarian follicle), so that is why lh tests are so effective in anticipating your most fertile time.

Q: How do I interpret results? The same as pregnancy tests?

Ovulation tests function differently than hCG pregnancy tests. A positive result (indicating an LH Surge) is indicated by a test band that is of equal or greater intensity (equal or darker) than the control band. A negative result for the LH Surge is indicated when the test band is of lesser intensity (lighter) than the control band or cannot be seen. Click here to see diagrams of test results.

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

ovulation test FAQ Unlike pregnancy tests, morning (first morning urine) is not the best time to collect samples for ovulation tests, as LH is synthesized in your body early in the morning and will not appear in your urine until the afternoon. The ideal time to test is in the afternoon, around 2pm, though testing may safely take place from 10am to early evening.

Q: Should I take the test the same time every day?

ovulation test FAQ Yes, be sure to test at the same time each day. Also, reduce your liquid intake around 2 hours before testing as a diluted liquid sample can prevent or hinder LH detection.

Q: When should I beginning testing with the ovulation predictor kit?

ovulation test FAQ To determine when to start testing, you must first determine the length of your menstrual cycle. The length of the menstrual cycle is the number of days from the first day of menstrual bleeding to the day before bleeding begins on the next period. Determine the usual length of the menstrual cycle over the last few months. Then, refer to the Cycle Chart to determine on which day of the menstrual cycle to begin testing. Click Here determine when to begin testing?

Q: How long after my LH surge will ovulation take place?

ovulation test FAQ Generally, ovulation will take place 12-48 hours after the LH surge is first detected (using afternoon urine samples), though 36 hours is considered to be the average length of time following the LH surge.

Q: When I get a positive on an ovulation test, when is the best time to have intercourse?

ovulation test FAQ To increase the chance of conception, it is best to have intercourse the day of the LH surge as well as following three days after.

Q: Does the appearance of faint 'test band' indicate an LH surge?

ovulation test FAQ A faint line (or a faint positive test band) does not indicate a positive result for an LH surge. While the presence of a faint line on a pregnancy test may indicate a positive result, a faint line on an OPK is always negative.

Q: Does taking my basal body temperature tell me the same thing as an OPK?

ovulation test FAQ Basal Body Temperature only tells of your LH surge after it is over. That is why the BBT method cannot predict the LH surge. Ovulation tests will tell you - with pinpoint accuracy - when your chances for conception are greatest.

Q: Can OPKs be used as contraception devices?

ovulation test FAQ Ovulation tests are designed to help facilitate pregnancy. They are not recommended for contraception.

Q: Can clomid interfere with test results or cause false positives?

ovulation test FAQ Clomid may cause false positives if you test for ovulation too early in your cycle. Please consult with your doctor about how to use OPKs in conjunction with Clomid - or other fertility and prescription drugs.

Q: Does a light test line and a dark control line indicate a positive result?

ovulation test FAQ Ovulation tests are unlike pregnancy tests - especially when it comes to interpreting results. The results are only positive if the test line is equal to or darker than the control line.

Q: I had a positive result yesterday and today. Does that mean there is something wrong?

ovulation test FAQ Such results may indicate that your the tests detected the LH Surge on the way up and again on the way down.

Q: What if I experience a BBT thermal shift but the ovulation tests failed to detect my LH Surge?

ovulation test FAQ It is possible to miss the surge. If you have a test line that is fairly dark one day then very light the next, you may have missed the actual surge. If your thermal shift occurs, you probably ovulated. It may be a good idea to test twice a day when you feel that you are close to ovulating. Another possibility is that you didn't hold your urine long enough (resulting in a diluted sample).

See Also:
> How do OPKs work?
> How do I interpret ovulation test results?


Me and my husband are planning to have kids .From the last couple of months my periods are having a length cycle of more
than 30 days , some times 45 days . So does Ovulation test kit work in my case ..

hi all
i am ttc iam 22 years old and really need advice me and my husbandd are ttc now 9 months , and no luck
i have taken the opk test to time my ovulation and took in concederation the instruction and on my 14 day i tested and it was positive so i dont know really iam i positive today or was i postive from yesterday , anyways so i had intercourse last night when i got the positive result , but i didnt do it the day before , so do u think i missed it ?
and today i feel i have a slight fever , and i tested again ( opk) and it was positive what des that mean ?

which type of hormon test due to detect the proper ovulation

For all the girls that have been on Clomid and using the OPKs I think that it is common to have positive results for a while. I got pregnant Mar 2009 and was on my 1st round of clomid and used the tests and I had 10 days of positive results. I'm not sure if it has anything to do with being pregnant or not. I wish the best to you ladies and lots of baby dust.

I've been trying to conceive for a little over three months now. I recently bought the opk and started testing on the 10th day of my cycle. I have a 27 day cycle and this is the 12th day; I've still not detected the LH surge. I've been testing first thing in the morning though. What do I do now to ensure I dont miss the surge-cos I'm only just seeing here that first urine isnt the best but I know I should keep testing at the same time daily...

I'm in the 16 day of my cycle and still haven;t detected my lh surge. is something wrong wuth me?

Hello everyone,

I miscarried in July at 17 weeks pregnant and had a D&E. My husband and I are back to trying after two cycles. I took 50mg of Clomid this cycle to make sure I ovulate. I am on CD 18 and for the last nine days I have had positive ovulation tests. My basal body temp spiked up yesterday so I know I already ovulated.

I'm wondering why I am still getting a positive result. Has this ever happened to anyone before? I don't want to get my hopes up, but am hoping it means my eggo is preggo Smile

Any advice would be greatly appreciated!

My husband and I have decided it is time to try for a baby. I quit taking birth control in august and the date of the start of my last period was August 21st. I am now on cycle day 38 as I skipped a period apparently and I tested last night and had a positive LH surge and tested again this morning to another positive LH surge, so not even knowing, we had sex yesterday morning and once I tested positive we had sex again last night. I don't know if I should try again today or wait til tomorrow. I'm not sure if more than once a day will hurt my chances and I'm also not sure if my LH surge just spiked last night and is still up this morning or what? I am really hoping we get pregnant the first try! Any advice?

I have PCOS (polycystic ovarian syndrome) which reduces my chances of falling pregnant. I fell pregnant 2 months after marriage and have an 8 yr old praise God Almighty. I have been trying for another child for over 6 years now. My period is irregular. I am a first time user of opk's and have no idea when I should test for LH surge. Please help

I've been doing the opk tests for some time now and the best advice i can give is get the kits that have 20 strips in them..i have to test two times a day..i have actually experienced tests that i had no surge the first test in the day and when i took the second one at 10pm i had hit my surge..if i hadn't tested twice i would have missed my surge all together..good luck to everyone..my hubby and i have been trying for some time to conceive again..i had to have a d&c in july..we were pregnant with identical twins..with no help from fertility drugs but unfortunately the pregnancy did not last..we lost them at 11 & 1/2 weeks..

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Ovulation Calculator

Format: 8/23/2014
Increase your chances of getting pregnant! Our Ovulation Calculator will help you predict when you ovulate - your prime time for becoming pregnant.

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By TTC veteran and mother of two, Elizabeth Andrews.