Lalie - Maybe this will shed some light! Sorry, maar ek is maar baie nuuskierig! Ek kan nie wag tot 12 uur nie!
The most common reasons for false-positives in pregnancy test kits like Clearblue are having traces of protein or blood in the urine and use of some prescription drugs, including promethazine that's used to treat allergy symptoms or diuretics. A damaged or expired kit also can lead to a false-positive, according to the Mayo Clinic. Taking the test within a month of miscarriage also can cause a false-positive because it takes time for hCG levels to reach zero again, advises Fertility Plus. Incorrect negative results are most often caused by taking the test too early, incorrect timing of the test such as waiting longer than 15 minutes to place the kit's dipstick in urine, or diluted urine caused by drinking too much liquid prior to testing, according to the clinic.
Clearblue falls behind First Response for early detection of pregnancy. First Response got top ratings by "Consumer Reports" and detects hCG levels of 6.5 mIU, or thousandths of an International Unit. Clearblue has the next-best level of detection among home pregnancy test kits at 25 mIU. The 6.5 level is about the level of hCG that is present when an embryo attaches to the uterine wall.
The level of hCG doubles approximately every 2 days. However, the Clearblue digital test made the top two at the Consumer Search product review website. The review cited the ease of seeing the words "pregnant" or "not pregnant" instead of needing to interpret pink or blue lines. The main downside Consumer Search cited was that the test is not as sensitive as others due to the need to reach the 25 mIU level.
Problems reported by customers include getting an image of a book instead of a result, which is a malfunction reading, a dead battery, and false-positive readings. In comparison, the First Response Early Result kit is more sensitive, but many testers say it's more difficult to interpret the lines, according to Consumer Search.
Read more:
www.livestrong.com/article/74446-clear-b...ility/#ixzz1470e49Rq