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Q: What could cause false test for Fentanyl?
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Can antihistamines cause false negative pregnancy test?

Promethazine (Phenagren) can cause a false negative.


Can lithium cause a false positive on a pregnancy test?

Yes, lithium can cause a false pregnancy on a pregnancy test.


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Can atenolol cause a false negative


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can atenolol cause a false negative on a pregnancy test


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Some infections in the kidney can cause false positive dipstick test results but not false negative.


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False positive for what test?


Will Fentanyl show in urine test i ate Fentanyl will this show in urine test?

It depends on the test used and how recently you consumed the fentanyl. I would assume it will be detected. Don't "eat" fentanyl. It's neither safe nor real bright.


Could Lamactil or Zoloft cause a positive reading on test for amphetamines or benzopine or benzodiazepam?

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