Ovulation prediction test kits most often come with five to seven sticks. You may need to test for several days to detect a surge in LH.
The specific time of month that you start testing depends on the length of your menstrual cycle. For example, if your normal cycle is 28 days, you'll need to test on day 11. (That is, the 11th day after you started your period.)
You will need to urinate on the test stick, or place the stick into urine that has been collected into a sterile container. The test stick will turn a certain color or display a positive sign if a surge is detected.
A positive result means you should ovulate in the next 24 to 36 hours, but this may not be the case for all women. The booklet that is included in the kit will tell you how to read the results.
You may miss your surge if you miss a day of testing. You may also not be able to detect a surge if you have an irregular menstrual cycle.