Clearblue is #1 OB-GYN Recommended Brand*The Clearblue Ovulation Test identifies your 2 most fertile days, so you can maximize your chances of getting pregnant naturally.The Clearblue Ovulation Test is over 99% accurate at detecting the LH surge**. Your result should appear on the Display within 3 minutes of doing a test. If no result appears an error symbol will appear on the Display within 10 minutes. Refer to the full instruction leaflet for information on the error messagesEasy to read - unique digital 'smiley face' resultsThe Clearblue Helpline 1-800-321-3279 is available for any questions or concerns