What kinds of conditions can cause a false positive pregnancy test?how common are these conditions and/or false positives?

In my years of experience with pregnancy and women's health issues, I have seen false positives periodically with home tests- it's not as common, but it can happen. The only exception is these newer digital tests- these have had issues of giving false positives more times than not so they have been deemed inaccurate. You can read about these issues here peeonastick.com/issues Also, different tests have different sensitivities to the pregnancy hormone, so none are alike.

Blood tests however are most accurate at 99.9% if done at the correct time- at least two weeks after a regular missed period. The claims of detecting pregnancy at the time of a missed period or sooner is false and is an advertising ploy. You need to test at least two weeks after a regular missed period- this gives the body enough time to produce enough pregnancy hormone that is detected by a test.

Some medications can cause both false positives and false negative. False positives can be caused by anti-convulsants, hypnotics, tranquilizers, and anti-parkinson medications.

Over the counter (OTC) pregnancy tests look for a specific chemical marker called human chorionic gonadotropin (hCG) which occurs after fertilization and implantation. OTC tests can give false positive or false negative results under specific conditions. False Negatives (telling you that you are not pregnant when you are) generally happen with very early tests, before the zygote has implanted.

Most women are fertile for 10-18 days before their menstrual cycle. Most OTC pregnancy tests claim that they can confirm or exclude pregnancy as early as one day after your first missed period. However, the zygote must have implanted and your body chemistry must have changed enough that you start producing enough hCG before the test can accurately detect it.

False Negatives are much more common than False Positives. False Positives (telling you that you are pregnant when you are not) run less than 1%. It is possible that your body is producing hCG if you have certain liver diseases or certain cancer or pre-cancer conditions.

Birth control pills, OTC drugs, and prescriptions will not contain hCG. The only drugs which contain hCG are fertility drugs. If you believe that you have a False Positive test, it is still important to consult your physician in order to safeguard your heath and to rule out other health conditions.

Your physician will perform a blood test, also looking for hCG, and may also perform an ultrasound to confirm or exclude pregnancy (or other conditions). As stated above, False Positives at less than 1% are much more rare than False Negatives.

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