In females, LH (Luteinizing Hormone) surge is a sharp rise in LH levels that triggers ovulation and the development of the corpus luteum. The LH surge is closely related to ovarian ovulation in female menstrual cycles.
Firstly, you need to know your menstrual cycle length. The length of one cycle is from the beginning of one period (the day of the first bleeding) to the day before the beginning of the next cycle. The first day of bleeding or spotting is considered as Day 1. If your cycle length is irregular, with a variation of more than a few days each month, take the average number of days for the last 3 months.
Ovulation typically occurs within 24-36 hours after the LH surge. If your Length of Normal Cycle is 28 days, ovulation usually starts 14 days before your next period. In this specific case, you can start testing on Day 11 (11 days after your last period began). If your normal period cycle length is 30 days, you can start testing on Day 13. Please refer to the following chart if you would like to know when you can start to test based on your cycle length.
Length of Normal Cycle (Total days) | Start testing __days after your last period began. | Length of Normal Cycle (Total days) | Start testing __days after your last period began. |
21 | 5 | 31 | 14 |
22 | 5 | 32 | 15 |
23 | 6 | 33 | 16 |
24 | 7 | 34 | 17 |
25 | 8 | 35 | 18 |
26 | 9 | 36 | 19 |
27 | 10 | 37 | 20 |
28 | 11 | 38 | 21 |
29 | 12 | 39 | 22 |
30 | 13 | 40 | 23 |
After reading the test result, you can determine if the LH surge has occurred. A positive test result indicates that you are likely experiencing the LH surge, and the ovulation will probably happen within 24-36 hours.
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