In the diazo bilirubin assay used to quantify serum bilirubin, bilirubin forms Azobilirubin by coupling with which reagent?

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Multiple Choice

In the diazo bilirubin assay used to quantify serum bilirubin, bilirubin forms Azobilirubin by coupling with which reagent?

Explanation:
The assay works by azo coupling, where bilirubin reacts with a diazonium salt to form a colored azo compound. The colored product produced is azobilirubin, which is what the spectrophotometer detects to quantify bilirubin levels. Verdobilirubin is a green pigment that can appear in related steps but is not the dye measured here; bilirubin glucuronide is the conjugated form and not the product of this coupling; azobilirubinogen would be an intermediate that isn’t the final color readout. So the pigment generated by the coupling that gives the measurable signal is azobilirubin.

The assay works by azo coupling, where bilirubin reacts with a diazonium salt to form a colored azo compound. The colored product produced is azobilirubin, which is what the spectrophotometer detects to quantify bilirubin levels. Verdobilirubin is a green pigment that can appear in related steps but is not the dye measured here; bilirubin glucuronide is the conjugated form and not the product of this coupling; azobilirubinogen would be an intermediate that isn’t the final color readout. So the pigment generated by the coupling that gives the measurable signal is azobilirubin.

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