Length Of Lh Surge And Ovulation

Sandra asks…

How long does the surge last?

That ovulation tests detect? Is it less than 24 hours? Is that why you have to do the tests at the same time each day?

Pregnancy Advisor’s answers:

Ovulation tests detect the LH surge, which can vary in length. I’ve read that it can be anywhere from 10-30 hrs. It is best to test between 11am and 5pm and test at the same time each day, some even recommend testing twice a day. Ovulation occurs 12-48hrs (with 36 being average) after the LH surge. Good luck and baby dust to you!

Helen asks…

What CD do you ovulate? How long is your cycle.?

I have 28 to 30 day cycles. Last month I ovulated on CD 17. Some months it has been CD 15.

What about y’all?

Pregnancy Advisor’s answers:

I have an lh surge between cycle day 9 through 14. I twice ovulated on cycle day 17–once was a clomid cycle and the other was with high levels of fertility injection medication with an IUI. I got pregnant on the clomid one but miscarried at 5.6 weeks. Usually I ovulate between cycle days 12-13. The funny thing is that my past two healthy pregnancies were from ovulating on day 11.
Ovulation fluctuates from month to month for most women. Women often believe regular cycles means ovulating on the same cycle day month after month but in fact means its so out of range that it’s hard to predict–example–cycle length of 23 days then 45 days then 32 days then 51 days. But being between 28 to 30 days is normal as if ovulating a few days later than usual.

Jenny asks…

Are ovulation kits allways right?

My las period was on 18th january and i have been doing an ovulation test every day since monday but the line has been fainter every day. My husband and i have been having sex every day since monday is there any chance i could still get pregnant?

Pregnancy Advisor’s answers:

They accurately measure LH at the time that you take them, and you will not ovulate without an LH surge. That said, there are many problems associated with OPKs.

First, some women have surges that last less than 24 hours. If your surge happens to start right after you take a test one day and you don’t test again until the same time the following day, you could miss your surge altogether. Second, LH is much lower in the morning, so if you’ve been testing then, its no wonder you’ve gotten all negatives. Third, if you are very well hydrated, your results on an OPK will be less dramatic.

Fourth, it may be that you are going to ovulate but haven’t done so yet. Depending on the length of your cycles, you may always ovulate late, and it may not be a big deal. Or it could be that ovulation this cycle was delayed by the stress of trying to conceive or for some other reason. Or you could have a short luteal phase; this is a problem for conceiving but it is pretty easy to fix if you talk to a doctor about it.

Finally, it may be that you are not going to ovulate this cycle. That doesn’t necessarily mean that you never ovulate, though.

A nice cheap way to tell if/when you ovulate is charting your basal body temperature and/or cervical signs.

Good luck.

Betty asks…

Which days are my fertile days if my shortest cycle is 30 days and my longest is 36?

Pregnancy Advisor’s answers:

I suggest you try using the Clear Blue Easy digital OPK sticks. They are very easy to use. Depending on the length of your cycle, it will give you days for you to begin testing. They are sticks that you pee on & will help determine your LH (lutenizing hormone) surge prior to ovulation. It is either a O or a smiley:) when there is a positive. You than have 24-36 hours to increase your chances on becoming pregnant.


Mary asks…

Ovulation tests…do they work?

I have been using ovulation sticks for the past two months and have not tested positive yet, although I know I am ovulating because my BBT spikes. Has this happened to anyone else?

Pregnancy Advisor’s answers:

On what day of my cycle should I start testing?

Length Start
21 5
22 5
23 6
24 7
25 8
26 9
27 10
28 11
29 12
30 13
31 14
32 15
33 16
34 17
35 18
36 19
37 20
38 21
39 22
40 23
41 24
42 25

What time of day should I test?

The best time to test is 2 p.m., or as close as possible. Anytime between noon and 8 p.m. Is fine, first morning urine is not recommended. The reason for this is that most women experience a surge in the morning, but it can take 4 hours for it to show up in your urine.

Make sure to test at about the same time every day.

I have a long cycle, how many days will I have to test?

It varies. The best thing to do is figure out the length of your shortest cycle in the past six months, and begin testing on the day mentioned in the chart above

How long after my LH surge should I ovulate?

Most people will ovulate 12-48 hours after the LH surge is detected, most common is 36 hours after the actual surge. One should get a bit more notice, 24-48 hours, by testing in the afternoon.

Test Same Color
Positive Some Brands
Test Darker
Positive All Brands

Faint Line
Normal Result
50% Color
Concern if Daily

35% Color Neg
65% Color Nearing

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