false positive pregnancy test

A false positive pregnancy test is a pregnancy test that indicates you are pregnant falsely. There are many possible reasons for this error. Home pregnancy tests are nearly 100% accurate, though the accuracy depends on various factors in the body and the performance of the test. In the majority of cases, the false positive result on a pregnancy test are directly linked to human error.

Q: What are the reasons for a false positive or false negative pregnancy test result?

A: A pregnancy hcg test checks for the presence of the pregnancy hormone hCG or human chorionic gonadotropin in your body. A false positive hCG pregnancy test, a positive hCG test when you are not pregnant, rarely happens, but if it happens then it can be seen both with blood and urine tests, though in each case, the causes can be slightly different. 


Q: Can I still be pregnant after a missed period even though my home pregnancy test (HPT) was negative? What does it mean if I am between 12-17 days post ovulation with no period and a negative pregnancy test?


Perhaps it has happened to you before - you and your husband were huddled in the bathroom, one staring at the home pregnancy test and the other reading the instructions. Unsure of your results, you debated over just how pink the line has to be in order for it to indicate a positive pregnancy. Like many, I too pondered the plausibility of negative results.


Home pregnancy tests are nearly 100% accurate, but that accuracy depends on various factors in the body and in the performance of the test. In the majority of cases, the false negative and false positive result on a pregnancy test are directly linked to human error.


A "Phantom hCG" is a positive blood pregnancy test without being pregnant. Patients with a phantom hCG will have a persistently and not significantly rising positive blood pregnancy test but the urine test is negative.


Besides a normal pregnancy there are other medical conditions that can give you a positive pregnancy test.

These include:


Q: My pregnancy test was positive three weeks after miscarriage. Does this mean I am pregnant?


Q: Is it true that fertility medications such as Humegon, Pergonal, Repronex or Fertinex, Clomid, Serophene, Gonal-F, and Follistim can cause false-positive or false-negative results on HPTs (home pregnancy tests)?


A chemical pregnancy is another word for a very early miscarriage or spontaneous abortion which aborts prior to seeing the fetus. A chemical pregnancy is a pregnancy that has been confirmed by a pregnancy test (either blood or urine), but there are no other significant clinical signs of the pregnancy and there is nothing seen on ultrasound. The urine pregnancy test is often faintly positive or blood hCg levels are very low and don't increase appropriately.


A positive blood pregnancy test without a pregnancy is also known as a 'false positive' test. There are many conditions which can give a phantom false positive hcg blood or urine pregnancy test.

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