The Clearblue Advanced Digital Ovulation Test identifies the fertile window of the menstrual cycle by monitoring two key urinary fertility hormones, estrone-3-glucuronide (E3G; one of the urinary metabolites of estradiol) and luteinizing hormone (LH).

It works differently to other ovulation tests Clearblue® Advanced Digital Ovulation Test works differently to other ovulation tests as it is designed to detect 2 hormones, estrogen and LH.

The Clearblue® Digital Ovulation Test range is over 99% accurate in detecting the urinary luteinizing hormone (LH) surge that occurs 24-36 hours prior to ovulation.

High Fertility is indicated as a flashing smiley face. If an estrogen rise isn't detected, or the estrogen rise and LH surge are close together, you may not see High Fertility. An LH surge happens about 24-36 hours before an egg is released from an ovary – 'ovulation'.

Smiley face – Peak Fertility This is the user's most fertile time and the result will be displayed for 48 hours. If the user has intercourse whilst Peak Fertility is displayed she will maximise her chance of getting pregnant.

Clearblue Advanced Digital Ovulation Test doubles your chances of getting pregnant (1): it is the only test that typically identifies 4 or more fertile days each cycle (2). These are the days leading up to and including the day of ovulation.

If conception is your goal, try to have sex with your partner a few times during this period to maximize your chances of getting pregnant. Even though you can still technically get pregnant anytime during the month, your highest chances of conceiving will be in these two to three days following your positive OPK test.

Ovulation tests may look similar to pregnancy tests, but they serve a different purpose. They also can't be used interchangeably because they detect the presence of different hormones.

The Clearblue® Advanced Digital Ovulation Test is the first and ONLY test that typically identifies 4 or more fertile days each cycle. It tracks 2 key fertility hormones to identify your High AND Peak fertility days, so you can plan ahead and have more opportunities to get pregnant.

Ovulation Symptoms

• Cervical mucus changes. Cervical mucus changes are one ovulation symptom you may experience.
• Heightened senses.
• Breast soreness or tenderness.
• Mild pelvic or lower abdominal pain.
• Light spotting or discharge.
• Libido changes.
• Changes in the cervix.
• Nausea and headaches.

For the majority of women who are considered healthy, ovulation typically occurs around 24 to 36 hours after the surge in luteinizing hormone (LH). Once ovulation is complete, LH levels then drop back to where they were prior to ovulation (read about early ovulation here).

(This is the best test for IUI timing.) Ovulation within 36 hours of a “smiley face” is a positive result (LH detected). This means you will have 1 to 2 fertile days. One kit can be used for more than 1 cycle.

LH surge: A 'smiley face' means you've detected your LH surge. Your 2 most fertile days are today and tomorrow so having sex in the next 48 hours will maximise your chances of getting pregnant. - Once you have read your final result eject the ovulation test stick and throw it away.

These simple urine tests are over 99% accurate at detecting the rise in a key fertility hormone (luteinising hormone) 24-36 hours before ovulation. A clear smiley face appears in the digital display when your LH surge has been detected, so you know this day and the following day are your best 2 days to try for a baby.

You can assume you're fertile on the day of a positive E1G reading, and for about 5 days after. Many women also find other methods like basal body temperature tracking and cervical mucus monitoring helpful in predicting ovulation to identify the fertile window.

There is a high chance of becoming pregnant if a person has sex within 12–24 hours after ovulation. A person can conceive at any time, but especially if they have sex from 5 days before until 1 day after ovulation. Ovulation occurs when one of the ovaries releases a mature egg.