The Clearblue Digital Ovulation Test provides clear, easy-to-read results that are highly accurate and sensitive to LH detection. Many studies find that this test produces more accurate results than other methods such as saliva tests and basal body temperature monitoring. Users agree that the Digital Ovulation Test accurately predicted when they'd be most fertile. However, while the digital display is very clear, some users find it challenging to interpret the results. It provides fewer peak ovulation days than tests that monitor both LH and estrogen, and some owners say replacement strips are difficult to find.
Studies show high accuracy, but some users disagree. Tests that monitor luteinizing hormone (LH) are repeatedly found to be one of the most accurate means of predicting fertility, and Clearblue Digital Ovulation Tests are the most-tested and most-recommended model. In general, at-home users agree -- many say the tests helped them identify their ovulation far more accurately than other methods. However, some users say the test offers iffy results, with some digital sticks repeatedly showing errors.
Though tests seem intimidating, they're surprisingly simple. Clearblue Digital Ovulation Tests come with test strips and a digital reading stick. The tests are meant to be used for 10 days of a woman's cycle in order to identify the two days with a spike in LH (which would indicate ovulation). Some users say the tests can seem overwhelming at first, but that they're actually very easy to use. Users find all the information they need in the included instruction booklet. Results take about three minutes to appear, which is quicker than most ovulation predictor kits.
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1. The Annals of Pharmacotherapy
In a review of the past 40 years of research, urine luteinizing hormone tests are said to be the most accurate means of predicting fertility. Clearblue Digital Ovulation Tests are found to have the highest sensitivity to LH, though monitors that also test for estrogen, like the Clearblue Fertility Monitor, may still be more accurate.
Review: Urinary-Based Ovulation and Pregnancy: Point-of-Care Testing, Samantha F. Eichner and Erin M. Timpe, February 2004
In a review of 11 well-known ovulation predictor tests, Clearblue Digital Ovulation Tests are among the best according to ConsumerReports.org. Though the testing is somewhat dated, the products tested are still available.
Review: When the Test Really Counts, Editors of ConsumerReports.org, February 2003
3. American Journal of Obstetrics and Gynecology
In this study, researchers compared the ability of basal body temperature (BBT) and Clearblue Easy Digital Ovulation Test to accurately detect ovulation. While BBT was a poor indicator of ovulation, the LH peak accurately predicted ovulation within three days 100 percent of the time.
Review: Reliability of Ovulation Tests in Infertile Women, Ellade Guermandi et al., January 2001
4. The Medical Journal of Australia
This study, now more than 20 years old, is the early foundation for Clearblue's accuracy claims. In 96 percent of cases, the Clearblue Digital Ovulation Test accurately measured an LH peak. It was found to be more accurate than BBT and cervical scoring for predicting ovulation.
Review: Evaluation of the Accuracy of the Home Ovulation Detection Kit, Clearplan, at Predicting Ovulation, K. Gudgeon, L. Leader and B. Howard, April 2, 1990
5. Sperm Meets Egg Plan
Sperm Meets Egg Plan editors say Clearblue Digital Ovulation Tests are easy to read thanks to the smiley face. They note that they're pricier than other ovulation tests, though. Editors don't speak to the accuracy of the test. It's unclear how products in this article were picked.
Review: Best Ovulation Predictor Kits (OPKs), Editors of Sperm Meets Egg Plan, Not Dated
More than 580 Amazon.com reviewers give Clearblue Digital Ovulation Tests an average score of 4.4 out of 5 stars. Some users report receiving many error messages which are unclear or difficult to interpret. Reviewers also complain that replacement strips are difficult to find, so they have to continue purchasing kits with the digital stick.
Review: Clearblue Easy Digital Ovulation Test, 20 Count, Contributors to Amazon.com, As of August 2013