When analyzing your LH test, the test is positive if the test line is as strong as the control line (or stronger).
LH is always present in the body, so you can often see a light test line on the strip when testing. As long as the test line isn't as strong as the control line, the test is negative.
Please check the manufacturer's information on how to read the test result if you’re using another brand of LH tests other than Natural Cycles’ own.
In the image below, you’ll find examples of positive and negative results on NC° branded LH tests.
The three tests at the top of the picture, marked LH-, are negative. The test line (left) is not as strong as the control line (right). You can log this as a negative LH test in the app and test again later in the day (at least two hours later).
The test at the bottom of the picture, marked LH+, is positive. The test line (left) is as strong as the control line (right). You can add this as a positive LH test in the app.
What if I have a negative and positive LH test on the same day?
If you get a negative and positive LH test result on the same day, you should log the positive LH test in the app. This way, the algorithm will know that you had an LH peak that day.
What if I only get negative LH tests?
A negative LH test doesn’t mean that you're not fertile, and it also doesn’t mean that ovulation won’t happen – this is important to remember. A negative test only means that no LH surge was detected at the time of the test.
Because the LH peak happens in such a short window, it’s common to get negative LH results, and some people may struggle with getting a positive result. This is highly individual, and depending on your body and medical history, the LH peak may be harder to catch for you than for others. To prevent the LH levels in the urine from diluting, you can try limiting the intake of fluids for a couple of hours before testing.
Ovulation can still occur at some point, even if you've only gotten negative LH tests. Remember to continue logging your temperature every day, and the algorithm will still confirm your ovulation if your temperatures indicate ovulation has happened.