In the diazo bilirubin assay, which complex indicates the presence of bilirubin?

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Multiple Choice

In the diazo bilirubin assay, which complex indicates the presence of bilirubin?

Explanation:
In the diazo bilirubin assay, bilirubin reacts with diazotized sulfanilic acid to form an azo dye called azobilirubin. This colored complex is what is measured, so its presence directly indicates bilirubin. Verdobilirubin is just another pigment related to biliverdin and isn’t the product identified in this reaction. Bilirubin glucuronide is the conjugated form of bilirubin, not the specific colored product formed in the diazo reaction. Azobilirubinogen would be an intermediate, but the detectable indicator of bilirubin in this assay is azobilirubin.

In the diazo bilirubin assay, bilirubin reacts with diazotized sulfanilic acid to form an azo dye called azobilirubin. This colored complex is what is measured, so its presence directly indicates bilirubin. Verdobilirubin is just another pigment related to biliverdin and isn’t the product identified in this reaction. Bilirubin glucuronide is the conjugated form of bilirubin, not the specific colored product formed in the diazo reaction. Azobilirubinogen would be an intermediate, but the detectable indicator of bilirubin in this assay is azobilirubin.

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