Final answer:
The commonly used methods for bilirubin analysis stem from a technique described by Van Den Bergh in 1937.
Step-by-step explanation:
The commonly used methods for bilirubin analysis stem from a technique described by Van Den Bergh in 1937. The Van Den Bergh test is used to measure bilirubin levels in the blood. The direct Van Den Bergh test involves the reaction of conjugated bilirubin with a diazo reagent, resulting in a purple red color. The indirect Van Den Bergh test, on the other hand, involves the reaction of unconjugated bilirubin with alcohol to produce the same color change.