Ovulation is related in time to the onset of the LH surge, and occurs 40–45 h following the onset of this surge as detected in blood. The commonest time for the LH surge (as detected in blood) to commence is between 05:00 and 09:00.
Is LH higher in the morning?
As the LH surge typically begins in the early morning hours, we advise our patients to test their second urine of the morning to reduce the chances of missing the LH surge.
What is the best time of day to take an ovulation test?
The best time to take an ovulation test is with the second morning urine – roughly between 10 am and noon. The ovulation predictor test looks for a hormone called LH or luteinizing hormone in your urine.
Do LH levels fluctuate throughout the day?
What is a normal LH level? LH levels change widely throughout your cycle, and your life. LH levels can even fluctuate based on how diluted your urine is when you take the test. A baseline LH can be computed by taking the average of LH values for the five days immediately before the LH surge.
Can you only get pregnant during LH surge?
Ovulation tests only identify the LH surge up to 24 to 48 hours before ovulation, and sperm can survive in the body up to 3 to 5 days. Therefore, if you have intercourse before you discover the LH surge, the egg could still be fertilized.
Does no LH surge mean you are pregnant?
If you have not ovulated during your testing days, you will not have detected the LH surge. It is probable that ovulation has not occurred. At times, women may experience an anovulatory cycle during which an egg is not released. Unfortunately, the best thing to do is to continue testing.