Tips: Why FDA HCG Test accuracy standard is 99% instead of 100% ? A few women may receive unexpected positive result caused by chemical pregnancy, miscarriage, blood or protein in the urine or some health condition or taking certain medicines that could elevate hCG level. Even it also rarely but it happens that some women may not receive expected positive result due to the HCG Level is not elevated as average to cut off level by missing period day. If you receive the very faint positive test line not as expected, we suggest you to wait a few more days or after missing period and test it again. If you don't get expected positive result please wait couple of days to do another test.
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