Clearblue Ovulation Test box of 10

The Clearblue ovulation test identifies the two days in your cycle when sexual intercourse is most likely to result in conception. How does this home test work? It measures the peak of luteinizing hormone (or LH) in your urine, which precedes ovulation by 24 to 36 hours. Ovulation is triggered by the sudden surge of LH secreted by the pituitary gland, located near the brain. Why choose this ovulation test? It is over 99% accurate and displays the result in just 3 minutes. It is very easy to read as there are no lines to interpret: an empty circle indicates that the LH surge has not been detected, and a smiley face indicates that ovulation will occur in 24 to 36 hours. The rest is up to you and your partner. Indications Ovulation Tests.