Which analyte is affected by both ammonia contamination and ascorbic acid interference?

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Multiple Choice

Which analyte is affected by both ammonia contamination and ascorbic acid interference?

Explanation:
Interference in colorimetric and enzymatic assays often comes from substances that alter the signal used to quantify an analyte. For urea, many common methods rely on urease to turn urea into ammonia, and then detect that ammonia colorimetrically. If there is ammonia contamination, the extra ammonia adds to the signal, making the result appear higher than the true urea level. Ascorbic acid, a reducing agent, can interfere with the color-forming step used in these ammonia-detection reactions, changing the color intensity in a way that can mimic more product and push the measured urea upward. Because both ammonia contamination and ascorbic acid interference can drive the urea reading higher, urea is the analyte affected by both.

Interference in colorimetric and enzymatic assays often comes from substances that alter the signal used to quantify an analyte. For urea, many common methods rely on urease to turn urea into ammonia, and then detect that ammonia colorimetrically. If there is ammonia contamination, the extra ammonia adds to the signal, making the result appear higher than the true urea level. Ascorbic acid, a reducing agent, can interfere with the color-forming step used in these ammonia-detection reactions, changing the color intensity in a way that can mimic more product and push the measured urea upward. Because both ammonia contamination and ascorbic acid interference can drive the urea reading higher, urea is the analyte affected by both.

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