False Positive Pregnancy Blood Test Results

A false positive test result a positive human chorionic gonadotropin hcg test result when you are not pregnant can occur for a variety of reasons. Human blood normally contains many different types of antibodies. But they can cause the body to start producing hcg which could get picked up on a pregnancy test and cause a false positive reading.

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First a quick summary.

False positive pregnancy blood test results. After an abortion or miscarriage a home pregnancy test may produce a false positive result since the levels of hcg in the body may still be relatively high. Other medications can also cause false positive pregnancy tests. Chemical pregnancies are common and often occur for no reason. As with urine home pregnancy tests it is possible to end up with false results both negative and positive from a blood pregnancy test.

Intact hcg reduced the number of false positive pregnancy test results from 13 to 1 a 92 reduction 95 ci 64 99 corresponding to a reduction in the false positive rate from 38 95 ci 22 56 to 3 95 ci 1 15. It takes at least seven days after fertilization for the test to become positive. It s also possible to get a false positive result if your body produces certain types. Though very rare a false positive blood test happens with a low positive blood pregnancy test the urine test is negative and there is no pregnancy.

Most over the counter pregnancy tests measure the levels of hcg in a woman s urine. If there s a false positive test result the test indicates that a woman is pregnant when in fact she isn t. Taking a home urine pregnancy test. There is another cause of false positive hcg test results that is unique to blood samples.

It may cause a false positive reading on an at home pregnancy test particularly if the test is taken too early. A phantom hcg causes a positive blood pregnancy test without being pregnant. A false negative test is negative but you re pregnant can occur if the blood pregnancy test was performed too early. Molecules made by our immune system that identify and neutralize invaders such as bacteria and viruses.

Wrong results with blood pregnancy tests a blood test might not detect human chorionic gonadotropin hcg even when a woman is pregnant if the test is done too early.