Final answer:
In obstructive jaundice, there is an increase in conjugated bilirubin in the blood. This can be detected using the direct Van Den Bergh test.
Step-by-step explanation:
In obstructive jaundice, the enzyme pattern observed is an increase in conjugated bilirubin in the blood.
Conjugated bilirubin is formed when bilirubin is processed by the liver and conjugated with glucuronic acid. Normally, most of the bilirubin in the blood is unconjugated, but in obstructive jaundice, there is a blockage in the bile ducts, preventing the excretion of conjugated bilirubin.
One test used to detect the presence of conjugated bilirubin in obstructive jaundice is the direct Van Den Bergh test. This test involves reacting conjugated bilirubin with a diazo reagent, which produces a purple-red color within one minute.