Final answer:
The three fractions of bilirubin that can be analyzed are direct bilirubin, indirect bilirubin, and total bilirubin.
Step-by-step explanation:
The three fractions of bilirubin that can be analyzed are:
- Direct bilirubin: This is conjugated bilirubin that reacts with Diazo reagent and gives a purple red color in the direct Van Den Bergh test. It is seen only in obstructive jaundice.
- Indirect bilirubin: This is unconjugated bilirubin that gives a purple red color with Diazo reagent when alcohol is added. It is measured in the indirect Van Den Bergh test and is seen in hemolytic and infective jaundice.
- Total bilirubin: This refers to the sum of direct and indirect bilirubin levels in the blood.