Bilirubin is categorized into bound bilirubin (CB) and unconjugated bilirubin (UCB). The normal value of CB is 0~6.8μmol/L, and the normal value of UCB is 1.7~10.2μmol/L. The reference ranges are different in different hospitals and different equipments, so please refer to your local hospital.
Bilirubin is a product of decomposition and destruction of senescent red blood cells in blood circulation, and is divided into bound bilirubin and unconjugated bilirubin. Among them, the normal value of conjugated bilirubin is 0~6.8μmol/L, and the normal value of unconjugated bilirubin is 1.7~10.2μmol/L.
According to the ratio of conjugated bilirubin to total bilirubin (STB, the sum of conjugated bilirubin and unconjugated bilirubin), it can assist in identifying the type of jaundice, e.g., CB/STB <20% suggests prehepatic jaundice such as hemolytic jaundice, etc.; the ratio between 20% and 50% suggests hepatocellular jaundice; and the ratio >50% suggests posthepatic jaundice, e.g., cholestatic jaundice.
In addition, combined bilirubin may be helpful in the early diagnosis of certain hepatobiliary diseases, such as cirrhosis in the uncompensated stage, hepatitis in the pre-jaundice stage, jaundice-free hepatitis, hepatocellular carcinoma and so on.
If abnormal bilirubin values are found, attention should be paid to timely consultation to identify the cause of the disease and further treatment or therapy as prescribed by the doctor.