This defect can occur at any stage of heme catabolism. Although the indirect bilirubin level is increased in normal controls when nicotinic acid is given, the increase is much greater in patients with Gilbert disease. Biochim Biophys Acta . The recommended normal levels for indirect bilirubin also known as unconjugated or pre-hepatic bilirubin is 0.1 to 1.0 mg/dl. What are the normal ranges of indirect bilirubin? Normal results for a bilirubin test are 1.2 milligrams per deciliter (mg/dL) of total bilirubin for adults, and usually 1 … 1998 Sep 30. Iyanagi T, Emi Y, Ikushiro S. Biochemical and molecular aspects of genetic disorders of bilirubin metabolism. Gilbert’s syndrome (GS) is a condition in which you have higher than normal amounts of bilirubin in your blood. A normal level is: Direct (also called conjugated) bilirubin: less than 0.3 mg/dL (less than 5.1 µmol/L) Total bilirubin: 0.1 to 1.2 mg/dL (1.71 to 20.5 µmol/L) Normal value ranges may vary slightly among different laboratories. Bilirubin levels can be used to monitor the progression of jaundice and to determine if it is the result of red blood cell breakdown or liver disease. Jaundice results from a defect in the normal metabolism or excretion of bilirubin. Yes his levels are in the normal range because his blood is 0.9 mg/dl and the normal range is 0.3-1.6 mg/dl. [Medline] . In type II, the level is <20 μg/dL. Indirect bilirubin is determined by measuring the total or serum bilirubin and then subtracting the direct bilirubin. The normal value for direct bilirubin or conjugated bilirubin is 0.1 - 0.3 mg/dL or 1.7-5.1 mmol/L. Bilirubin that is bound to a certain protein (albumin) in the blood is called unconjugated, or indirect, bilirubin. However, urine bilirubin is relatively insensitive for detection of liver disease. Bilirubin test results are expressed as direct, indirect or total bilirubin. Total is a combination of direct and indirect bilirubin. Medical literature sources have minor variations in "normal" levels). For those under 18, the normal level will be will be 1 mg/dl. Bilirubin … Healthy adults make 250 to 350 milligrams (mg) of bilirubin each day. Bilirubin is the substance that gives the bile its color, which is bright greenish yellow. Elevated urinary bilirubin occurs in patients with obstructive jaundice or jaundice due to hepatocellular disease or injury. This can be done by measuring two different chemical forms of bilirubin — direct (or conjugated) and indirect (or unconjugated) bilirubin. Talk to your provider about the meaning of your specific test results. The recommended normal levels for indirect bilirubin also known as unconjugated or pre-hepatic bilirubin is 0.1 to 1.0 mg/dl.