LH is one of the hormones produced by the pituitary gland. But once a developing egg follicle reaches a certain size — usually around the midpoint of your cycle — LH secretion surges to really high levels. This hormone surge is what triggers ovulation about 24 to 36 hours later. Ovulation is the release of a mature egg from the ovary. It signals the beginning of your fertile period.
After the egg is released, the empty follicle on the ovary is converted to a structure known as the corpus luteum. It then begins to secrete progesterone. Progesterone is a hormone needed to support a potential pregnancy. Your LH surge is important because it initiates the beginning of ovulation and your fertile period. After that, your fertile window is over. This makes it very important to be able to identify this best time to conceive.
These are readily available online and in most pharmacies. These kits are similar to pregnancy tests because they measure hormone levels in your urine. Each kit is a little different in how they register a positive result, so make sure to check the instructions. A positive result indicates the presence of a high amount of LH, or your LH surge. The tests can be expensive to use that frequently.
Ovulation usually occurs about 14 days before your period. Your LH surge occurs a day or two before that. Testing in the morning is best.
She can then continue testing every day or every other day until she gets a positive test result. At Houston Fertility Center, Dr. Sonja Kristiansen and her team offer a wide range of services to assist individuals struggling with infertility. To find out how we can help you on your path to parenthood, send us a message online or call us at She is a board-certified Reproductive Endocrinologist Infertility REI specialist who is proud to help hopeful parents fulfill their dreams of having children.
Our center is affiliated with the:. We provide convenient care for patients from greater Houston and visitors from out of town. For more information about our services, contact our office online or call today. Some images are of models, not actual patients.
Sitemap Privacy Policy Login. As we noted earlier, your maximum chance for pregnancy occurs in the three days leading up to and including ovulation. If you see a positive OPK, it means you should start getting busy! Having sex during the three days immediately after a positive test increases your chances of getting pregnant. Typically, people will see a positive OPK for a few days after their initial positive test. Most women experience it for up to 72 hours, when the LH surge is still present in their urine.
In fact, we almost always have a small amount of luteinizing hormone in our urine. This is why the test comes with a control line. It will continue to test positive throughout the surge. The trick is to be intimately in tune with your body by keeping tabs on multiple fertility cues, rather than relying on a kit or an app alone. By tracking your LH, CM, and basal body temperature — or even better, continuous core body temperature — you could boost your chances of identifying the fertile window before ovulation.
And one final pro tip: When you get an LH peak, have sex in the next 12 hours if possible, and the next day too. Want to learn more? Check out this blog about cervical mucus and how it can help you get pregnant.
Join our weekly blog email for charting tips, updates and exclusive offers. Share this post:. Priya Fertility Monitor Now Available Once you decide you're ready to get pregnant, you want it to happen pronto. When is my fertile window? LH surge: Is it 16 hours or 48 hours? Ovulation isn't necessarily on day 14 and may be later if you're older Ovulation trackers typically rely on algorithmic guesses about the average woman's cycle.
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