What does a positive LH test mean?

“I took an LH-test which showed positive, however, Natural Cycles indicated that my ovulation day was in fact later than this?”

We’ve got the answer to the question you’ve all been asking:

The hormone LH actually rises before ovulation and does not indicate the day of ovulation. So while you might have a positive LH test, it does not indicate that you have ovulated, nor that you are ovulating at this very moment.

A positive LH test is rather an indication that ovulation is about to occur.

That’s why an ovulation test can be positive a few days before ovulation up until the day of ovulation. The algorithm takes LH tests as indicators into account, yet the temperature shift indicates and verifies that ovulation has indeed occurred. Sometimes LH tests can give what is called a false-positive. This means that even if the test indicates that your body is experiencing a rise in LH, it doesn’t actually mean that ovulation is going to happen within the next day or so as you’d expect. And to note, this can be especially true and common if you have Polycystic Ovaries Syndrome (PCOS). In these cases, NaturalCycles will not agree with the ovulation test because a rise in LH before ovulation has to also accompany a rise in temperature after ovulation. This is why combining both ovulation tests and temperature is such a powerful combination because together they confirm that ovulation has definitely occurred.

Your Natural Cycles team.