What are the Sensitivity Levels of the Most Popular Pregnancy Tests?
If you are trying to get pregnant you probably know that there are many different home pregnancy tests that are on the market. While many women believe that all of the pregnancy tests are basically the same just in different packaging, this is not all the case. Some of these tests are much more sensitive to the pregnancy hormone, which is called hCG. The more sensitive a pregnancy is to this hormone the earlier you can test and get a positive result if you are pregnant. For example, a home pregnancy test that is said to read 20mIU/ml of hCG is much more sensitive and will give you an earlier result that reads 100mIU/ml of the pregnancy hormone.
This pregnancy hormone is caused by the embryo as it implants into the lining of the uterus and begins to grow. The hormone will begin to be secreted six to 10 days after conception has take place and the levels will double every two to three days. For this reason you might not get a positive result on the sixth day after conception but by the 10th or 11th you would probably get a positive result even with one of the less sensitive tests. If you want to determine that you are pregnant rather than waiting until a missed period or even days after your missed period you will want to choose one of the tests that is more sensitive and will pick up on the smallest amount of the pregnancy hormone in the urine.
Listed are some of the more popular home pregnancy tests and their sensitivity:
Aim Midstream: 20mlU/ml
One Step: 25mlU/ml
Clear Blue Easy: 50mlU/ml
First response: 50mlU/ml
Its important to remember that every woman has different levels of the pregnancy hormones in their body. Once you are able to achieve a positive pregnancy test you should continue to get positive pregnancy results assuming you did not miscarry or receive a false positive because the levels of the hormone will continue to rise until 12-13 weeks of pregnancy when it peaks. By 10 days past ovulation most women have anywhere from 10-50 mlU/ml of hCG and by 22 days past ovulation it will range anywhere from 150 to 800mlu/ml of hCg, meaning most of the tests will work by the time you are 22 DPO but only a handful may work at 10 DPO. Even if you get one negative test it does not necessarily mean that you are not pregnant, it just means that you dont have enough of the hormone to be detected by one of the tests. You can always test again in a few days and get a much different result!