kate_fenwick_dorsey's profile

1 Message


120 Points

Thursday, October 16th, 2014 11:14 PM

False Positive?

Wondering if there's such a thing as a false positive? I am pretty regular, and I'm "due" to ovulate on the 21st (Tuesday). Took a test yesterday and it was negative, as I expected. Took a test today and it had skipped right over "high" fertility to "peak" fertility. My question is...is it possible for it to calculate "peak" fertility after only taking one test? Is the first test always negative? I thought it was supposed to give me the four best days?

465 Messages


5.8K Points

9 years ago

Thanks for your question, Kate.  I'm guessing you're using Clearblue Advanced Digital Ovulation Tests.  Although there are some factors which can affect your result, it is possible for the result to change from Low Fertility to Peak Fertility without displaying High Fertility.

This test tracks the changes in 2 key fertility hormones:  estrogen & LH.  If the necessary changes in estrogen are detected, High Fertility will be displayed.  And if an LH surge is detected, Peak Fertility will be displayed.  The number of High Fertility days displayed may be more or less than 2.  Hormone levels & cycle length vary from woman to woman, even from cycle to cycle in the same woman.  As a result, your High Fertility results reflect your unique hormone changes.     

The result can change from Low to Peak without showing High if the hormone changes occur on the same day, if your estrogen level isn't high enough to be detected by the test, if a test is inadvertently missed, or if testing begins too late in your cycle.  

Feel free to give us a call if you'd like to talk through questions.  We can be reached at 1-800-321-3279, Monday through Friday from 8:30am-5:00pm ET.  When calling, please mention reference #FB896.  Hope this helps!