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Potential Laboratory Test Interferences

Note: This information is also available in referenced form in the TYLENOL® product monograph. (View PDF)

Using the most current analytic systems, acetaminophen does not cause laboratory test interferences. However, there are certain methods with which the possibility of laboratory changes exists, as described below:

Blood Tests

Acetaminophen at recommended doses does not appear to interfere with glucose analysis using currently marketed blood glucose meters. For further detail, it may be advisable to contact the specific laboratory instrumentation manufacturer.

Urine Tests

Acetaminophen in therapeutic doses may interfere with the determination of 5-hydroxyindoleacetic acid (5HIAA), causing false-positive results. False determinations may be eliminated by avoiding acetaminophen ingestion several hours before and during the collection of the urine specimen.

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