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The test women read most accurately

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.1

To achieve these results, this home ovulation testing kit employs a rapid 'sandwich' assay which incorporates two distinct antibodies to detect two separate antigenic sites on the LH molecule: the αLH site and βLH site.

If LH is present in the user's urine, its βLH antigenic site is bound by the anti-βLH antibody that is attached to a particle to form a complex. The urine flows along the test stick to the Surge zone, where the antigenic site on αLH is bound by the Surge Line's immobilized anti-αLH antibodies. This means that the LH/blue particle complex cannot move any further down the test strip, resulting in an intense blue 'Surge Line' which is read by Clearblue's Digital Reader. If the Clearblue Digital Reader detects that the test was completed successfully and that the Surge Line intensity is over a certain threshold, the display will show a 'Surge' result. This indicates that conception is most likely if intercourse occurs during the next 1-2 days.

It is known that many women have small levels of LH present in their urine throughout their cycles. The Clearblue Digital Ovulation Test therefore sets a personalized threshold level for each woman, by measuring their change in LH level from their personal baseline.

Reading the results of traditional line tests can be difficult for users, with as many as one in four people misreading the result from a traditional ovulation test.2 Digital results take away this potential human error and data shows that when compared to traditional line tests, the Clearblue Digital Ovulation Test is more accurately read by consumers.3 A circle with a smiley face means the test has detected the LH surge. Having intercourse during the next 48 hours will maximize the chances of conceiving.

Variation exists with regard to total menstrual cycle duration between and among women, and such variation appears to result from changes in the early, follicular phase of the cycle.4 Because of these differences in follicular phase length, the day of the LH surge varies from woman to woman and from cycle to cycle, making it more challenging to accurately detect the timing of peak fertility. Indeed, in over 40% of women aged 18-40 years, cycle lengths vary by 7 days.5 Studies have therefore shown that performing 20 tests rather than 7 or 5 offers a greater chance of testing on the correct day. Indeed using 20 tests per cycles covered 99% of LH surge days in typically cycling women.6

In order to help women with regular or irregular cycles, Clearblue produces two digital ovulation packs:

Clearblue Digital Ovulation Test Clearblue Digital Ovulation Test - result 1 Clearblue Digital Ovulation Test - result 2

The Clearblue Digital Ovulation Test range is:

1 SPD data on file. Clearblue Digital Ovulation Test has been shown to be 99% accurate when compared to a reference method in laboratory studies using urine samples from 123 cycles where LH surge was identified by a reference method.
2 SPD data on file. DOT Consumer Study - One in four women can misread a line test.
3 SPD data on file. In a study of 72 women reading Ovulation Tests typical of normal cycle results, more women obtained the same result as a laboratory professional when reading Clearblue Digital Ovulation Test than when reading other Ovulation Tests.
4 Miller PB, Soules MR. The usefulness of a urinary LH kit for ovulation prediction during menstrual cycles of normal women. Obstet ecol 1996;87(1):13-7.
5 Creinin MD, Keverline S, Meyn LA. How regular is regular? An analysis of menstrual cycle regularity. Contraception 2004 Oct;70(4):289-92.
6 Johnson SR, Shaw R. Testing Strategies for the Home Detection of the LH surge. SPD data on file.