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Doctor insights on: What Causes False Positives On Pregnancy Tests

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Does a mirena (levonorgestrel) cause false positives on pregnancy tests?

Does a mirena (levonorgestrel) cause false positives on pregnancy tests?

It shouldn't: Although the Mirena (levonorgestrel) intrauterine device releases hormones somewhat similar to a pregnancy and may stop a patient from having menstrual periods, it doesn't produce HCG like a true pregnancy. Since the pregnancy test looks for hcg, the Mirena (levonorgestrel) device shouldn't cause a false positive. ...Read more

Dr. Adam Lewis
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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Hi I have had 7 positive pregnancy tests, 2 being digital, I have cysts on my ovaries, could this cause false positives?

Hi I have had 7 positive pregnancy tests, 2 being digital,  I have cysts on my ovaries,  could this cause false positives?

Not likely: However, urine tests don't offer you the ability to see if your level is going up like a blood (serum) pregnancy test. Would be a good idea to call your physician and ask for a serum quantitative HCG and have him/her call in some prenatal vitamins as well until your first OB appointment. Also, follicles (egg cysts) are needed to conceive and a corpus luteum cysts is needed for progesterone. ...Read more

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My wife has endometriosis and systemic lupus, we took 2 (cheap) pregnancy tests and they both turned out positive. Can lupus or endo cause a false pos?

My wife has endometriosis and systemic lupus, we took 2 (cheap) pregnancy tests and they both turned out positive. Can lupus or endo cause a false pos?

No.: False positive urine pregnancy tests are rather rare. Some possible causes are operator error, a biochemical pregnancy, or interference with the assay from recent infertility therapy. SLE and endometriosis should not impact the specificity of a urine pregnancy test. ...Read more

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Could Plan B cause spotting and false positive pregnancy tests?

Could Plan B cause spotting and false positive pregnancy tests?

Plan B: No. Plan b will not cause a postive pregnancy test. If positive its because most likely you are pregnant and the Plan B did not work or you took it more than the recommended 3-5 days after an unprotected sexual encounter. See your obgyn for more testing and ultrasound. ...Read more

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A friend of mine claims Paragard IUDs can cause positive pregnancy tests, by producing the hCG hormone. This is completely false, right?

A friend of mine claims Paragard IUDs can cause positive pregnancy tests, by producing the hCG hormone. This is completely false, right?

Wrong: Paragard IUDs do not cause + pregnancy tests, so if somebody does have a positive pregnancy test with a Paragard IUD in place, this should be evaluated further to determine if the pregnancy is in the uterus or outside the uterus (ectopic pregnancy) ...Read more

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I have positive urine pregnancy tests negative blood i've taken mefenamic acid can that cause false positives ?

I have positive urine pregnancy tests negative blood i've taken mefenamic acid can that cause false positives ?

Blood test more: Accurate. Please go with the results of the blood test and if you have any symptoms, consult your doctor. See this site for more info. http://www.webmd.com/baby/guide/pregnancy-am-i-pregnant. ...Read more