Marijuana use and abnormal renal function have been reported to cause false-positive elevations of hCG, 2,3 but neither of these were contributing factors in this case. Another frequent ...

A home pregnancy test detects the presence of Human Chorionic Gonadotropin (HCG), a hormone produced during pregnancy. Fertility treatments or improper testing are common causes of false positives.

"If you have had a recent miscarriage, the HCG level can stay in your bloodstream for several days. This can result in a ...

A false positive, though, is a much rarer occurrence than a false negative. Pregnancy tests that you have done in the doctor's office can determine the amount of hCG in your blood, which shows up ...