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Ovulation Test FAQ

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?


Can someone please give me peace of mind! I am on my first cyle of clomid ( 100mg)> starting using digital OVU test on day 11. I usually take it at 5:30 everyday, I am on say 22 and still nothing. We have been babymaking every other day just help sitatuation. My cycle is usually 41 days, but last month it was 34 days. What should I do?

I have found that I was religiously using OPK's in the afternoon and I was often seeming to miss my surge. Then one cycle I decided to test the next morning and got a positive. So yes I believe do we are all different and although they recommend to test in the afternoon, I would advise when you start to see your line darkening or when you are a couple of days before ovulation in your cycle that you test in the morning, afternoon and at night. Although I have got positives in the afternoon too previously. I have reported before on this thread and again I really recommend using internet OPKs they are very reliable and cheap and you can get them in packs of 100, so it makes doing it this way a reality and ensures you don't miss your surge. I was spending a small fortune on shop bought ones before a friend got me on to the internet ones. Good luck!

All I can say is that every person seems to be different. My cycles and when I ovulate can vary every now and again, I find stress the main factor in delaying ovulation. Take this month for example, right around when I was going to ovulate a stressful situation occured. I have about a 28 day cycle. I got a couple of days of faint lines on day 11 and 12 and I assumed I would get a positive the next day and this is when my charting would show I should be getting a positibve OPK (about a day before ovulation) but then the stressful sitation occured and the next day I had virtually no lines (so very faint). I kept on testing and still virtually no line, then three days later I got my positive. Your body can be gearing up to ovulate but then decides the conditions are not right and may try again later, which is what seemed to happen to me. I would recommend to continue testing, getting cheap OPK's off the internet makes this a far easier option price wise and I find them just as good as the shop bought ones. I am awaiting to see if this month I fall pregnant, fingers crossed. I hope this information helps, I have appreciated reading other people's experiences.

i took the ovulation test yesterday and had a smily face took it today and it saw just no face ---> O what does that mean if yesterday it was there and now its not?

I have been using the test strips since day 10 and today is 16. I got a positive test result at about 10 am this morning, and then I wasn't for sure if it was right so I tried again in the afternoon, and it was way lighter.. I am just wondering how long the test strips stays positive?? why was my test strip so dark this morning, then lighter now?

I know lots of ladies who never manage to get the 'proper' positive on OPKs. A couple of bits of advice:
Unless you test several times throughout the day there is always a chance that you will miss your surge (i.e. if it happens in the night you might get a feint line the day before during the 'build up' and a feint line the day after on the 'way down').

If you get continual feint lines then I would say wait until you get a darker one which would indicate a change of some sort. For me, I had no test line at all for 3 days and then had 2 days of feint lines followed by no lines again. Taking into consideration the time in my cycle and the consistency of my Cervical Mucus I could deliberate that I ovulated around the time of the feint lines.

To be sure its worth BD-ing every other day during your 'fertile week' anyway.

I don't think its an exact science though Smile

I'm hoping someone can answer this question! I've been using the opk tests for a couple of months now. I initially tested in the afternoon at about 2pm (give or take 2 hours) everyday & received a (-) result every time, never (+). Until......I decided to test in the early morning (7am) and received a (+). So I decided to test in the early am and afternoon. My opk tests are (+) every morning since day 8 (which is the first one I took for this cycle) & (-) every evening. They tend to be (+) for approximately 10 days, only in the early morning. I don't get it. Does anyone understand this? I 've tried different brands & get the same result. (-) pregnancy tests. Thanks.

it is positive if my ovulating kit have two lines. the test line was not has bright as the control line. am i positive and should i have intercourse with husband this week. i will definitely test tomorrow again.

Hello Ladies,

I suffered for months trying to read the lines...and missing my ovulation by mistake. I switched to digital ovulation tests...and problem solved. You can find it for much less online. Yes, it is worth every penny! Good luck to all!

Hello Ladies after reading a few of your comments i noticed all of your comments never get answered. Witch i can only imagine is annoying. I am no expert but with my period they can vary from 22 days to 46days i know night mare. So after 7 months of trying i kept a chart and found that between 10 to 16 days i should ovulate. I got the cheap ovulation kit from tesco tried it on day 10 i got a light line so i just thought i have either missed ovulation or it will occur soon. So tried on day 12 got 2 red lines but for some reason i dismayed it i know mad or what it was clearly a sign of ovulation but because it was my first positive i questioned it lol. So my point is if its a faint line i guess you have either missed it or its coming so just try testing for a few more days and see what you get but for goodness sake if its to red lines get baby making lol don't do what i did.
Good luck all xxxx

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Ovulation Calculator

Format: 5/26/2018
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By TTC veteran and mother of two, Elizabeth Andrews.