Does AZO Cause False Positive Nitrites? Understanding the Pharmacological Interference
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4 min read
Over-the-counter UTI pain relief medications, like those from the brand AZO, contain a potent azo dye that can significantly interfere with routine urinalysis, particularly colorimetric tests. If you are concerned about whether **does AZO cause false positive nitrites**, it is important to know that its active ingredient, phenazopyridine, is a known cause of misleading results on urine dipstick tests. This article explores the pharmacological reason behind this interference and how it impacts the accuracy of UTI detection.
