Direct bilirubin more than 90mmol/L and total bilirubin more than 120mmol/L are abnormal and both are above normal levels. The normal level of direct bilirubin is between 0 and 6.8 μmol/L, and the normal level of total bilirubin is between 3.4 and 17.1 mmol/L. Therefore, both direct bilirubin more than 90 mmol/L and total bilirubin more than 120 mmol/L are abnormal and are common in obstructive jaundice. Total bilirubin is the sum of indirect bilirubin and direct bilirubin, which can be used as an indicator of liver function and an important basis for determining jaundice. Clinically, elevated total bilirubin with elevated direct bilirubin is usually indicative of obstructive jaundice, which includes extrahepatic bile duct obstruction and intrahepatic bile duct obstruction. Meanwhile, the ratio of direct bilirubin and total bilirubin can be used to determine the type of jaundice. A ratio of direct bilirubin 90mmol/L to total bilirubin 120mmol/L of more than 50% is often indicative of obstructive jaundice. If the ratio of direct bilirubin 90mmol/L and total bilirubin 120mmol/L is greater than 50%, it can indicate obstructive jaundice. If the ratio of direct bilirubin 90mmol/L and total bilirubin 120mmol/L is greater than 50%, it can suggest obstructive jaundice.