How common are false positives?

  1. How common is it to have a false positive HPT? How about two of them? Had a pt in ER recently who we did UPREG on before an x-ray and it was +. Then added quant HCG, guess what! NEGATIVE! <2. Repeated UPREG per pt request, +! I know you L&D folks probably don't deal with pregnancy testing (no need for that!), but have you come across this anytime in your career? Know of any causes, other than the fertility meds (which she was not on)? We thought maybe bad batch of tests, but lab said they did 2nd test with different lot #.

    thanks a lot.
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    About gotaluvtheER

    Joined: Feb '04; Posts: 20


  3. by   Energizer Bunny
    I'm just a student but I know that I have never had a false positive. In fact, I had a miscarriage and tested three weeks later and was positive. I called the hospital and they said my HPT was so low when I miscarried that there is no chance that the miscarriage was causing the positive and that I had to be pregnant. I am anxious to see what kind of answers you get.
  4. by   SmilingBluEyes
    Here is an excellent article discussing the rare occurence of false pregnancy testing and what can cause it. VERY rare but possible. Here is possibly how:

    hope this helps you.