Which analyte is severely affected when contaminated with ammonia?

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Multiple Choice

Which analyte is severely affected when contaminated with ammonia?

Ammonia contamination disrupts measurements that rely on detecting ammonia directly, so urea is the most affected. In most clinical tests for urea, the method uses urease to break urea down into ammonia and carbon dioxide, and the assay then measures the resulting ammonia (or a related signal). If the sample already contains ammonia from contamination, that extra ammonia adds to the signal, making the urea level appear falsely high. Other common analytes like glucose, creatinine, and uric acid are measured by methods that don’t rely on detecting ammonia, or are less directly impacted by the presence of ammonium; thus they don’t show as pronounced an interference.

Ammonia contamination disrupts measurements that rely on detecting ammonia directly, so urea is the most affected. In most clinical tests for urea, the method uses urease to break urea down into ammonia and carbon dioxide, and the assay then measures the resulting ammonia (or a related signal). If the sample already contains ammonia from contamination, that extra ammonia adds to the signal, making the urea level appear falsely high. Other common analytes like glucose, creatinine, and uric acid are measured by methods that don’t rely on detecting ammonia, or are less directly impacted by the presence of ammonium; thus they don’t show as pronounced an interference.

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