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What factors can cause false readings on urine test strips?

Urine tests can sometimes give false results, meaning they show a problem when there isn't actually one and similarly do not correctly determine a problem when there is one. This can happen for different reasons, such as if the urine is too old or if certain substances or medications are present. Also, if the test is not used properly or if the urine container is not sterile or properly cleaned, it can also give false results.

Common reasons that cause false readings on a urinalysis test are:

  • Taking specific drugs, such as Levodopa, Phenazopyrazine, and a high dosage of Vitamin C can cause a false positive for Ketone.
  • Dehydration, high specific gravity, and a delayed urine sample can also cause a false positive for Ketone.
  • Urine with a pH of 7.5, urine with the presence of penicillin, pus, semen, or vaginal can cause a false positive for high protein in the urine.
  • A high dosage of Vitamin C can cause false-negative nitrite.
  • Drug Tetracycline can cause false-negative leukocytes.
  • Vitamin C in urine can also cause false-negative results for blood cells and glucose.
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