Causes False Positive Pregnancy Tests

Home prgnancy test are 97% accurate. This makes false postive pregnacy tests a rare occurance. There are a few circumstances that may cause a false postive. First a chemical pregnancy 1/2 of all pregnancy end in miscarriage a chemical pregnancy is just that a early pregnacy that ended in miscarriage show traces of HCG enought to trigger a test. Missed reaction time is another reason if the test is left to sit to long it may show false positive line. Chemical interference is another cause if you are taking any drugs having hcg in them this can trigger a false postivie. And last but not least evaporation line some test show a light grey evaporation line which is sometimes interpeted as a false postive test. It is always best to follow up with your doctor after doing a home test for confirmation of pregnancy.