Basically, LH levels are in low or mid-range during most of your cycle. According to Dr. Direito, the pattern of increase and decrease in LH varies from person to person. In addition, the results of the test are also affected by the individual's test method and urination.
Therefore, slight fluctuations in the low to mid-level can occur and it does not have any significant meanings. However, when the ovulation day is coming, the LH level suddenly will rise. That's why we call it LH surge. It does not necessarily mean that your LH level is gradually increasing. Therefore, we recommend that you take the test at the same time every day to keep the test interval constant.
The LH peak is usually maintained for 1 to 3 days. Depending on the individual, the peak may disappear within a few hours or it may last for more than 5 days. If the time to maintain the LH peak is too short, you may not be able to see a positive result if it does not fit well with the test time. If this is the case, it is a good idea to test it twice a day. If you do not get a peak even after weeks of steady testing, you may have a wrong test method, or you may have taken too much of your drink to get your urine diluted. Finally, we recommend that you consult a doctor if you don't get pregnant even after using the ovulation test for a long time.
Smilereader helps you get pregnant faster! Source: Direito. Variability of the LH surge. Fertil Steril 2013.