I hope I'm not the only one that never noticed these FRER coupons. They are only for a dollar off, but hey, for what they charge and the amount I've bought over the years..... that's a lot of dollars I could've saved! I never bother opening the little instruction book, cuz I'm pretty sure we've all got that down. But today I decided to hunt for info on what percentage of HCG it detects (which I couldn't find on packaging) - and there they were. Just thought I'd give others the heads up cuz I'm hoping I'm not the only one!
Also, I did find an article that says the following:
First Response Early Result stood out, having an analytical sensitivity of less than 6.3 mIU/mL. This product can be expected to detect more than 95% of pregnancies on the first day of a missed menstrual period, and evaluators had 100% confidence in positive and negative results using this product.
Clearblue Easy Earliest Results was the second most sensitive test in this study, having an analytical sensitivity of 25 mIU/mL. This product would likely detect 80% of pregnancies on the first day of the missed period, and evaluators had 100% confidence in its positive results and 67% in negative results.
The bulk of products we evaluated (five of the seven) had analytical sensitivities of 100 mIU/mL or greater. These products would likely detect 16% of pregnancies or fewer on the first day of the missed period, and evaluators had only 22% to 57% confidence in positive results and 26% to 85% confidence in negative results. Furthermore, three of these five products—AccuClear, CVS One Step, and E.P.T.—had clear indications of technical or design problems in which devices failed to work or were faulty. Three of these five products, including two of the products (Eckerd One Step, CVS One Step, and AccuClear) that failed to work properly, were representative of the numerous similar branded products made by Inverness Medical Innovations Inc.[3] These include the Inverness Medical Early, Rite Aid One Step, Savon Osco One Step, Target Brand, Walgreens One Step, Family Dollar One Step, and several others.[3] The other two lower-sensitivity, lower-confidence products, Fact Plus Select and E.P.T., are made by Ross Products and Pfizer Consumer Healthcare, which also makes other similar products, Fact Plus Pro and Confirm.