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At a glance

Also known as

Total bilirubin; neonatal bilirubin; direct bilirubin (conjugated bilirubin); indirect bilirubin (unconjugated bilirubin)

Why get tested?

To screen for, detect and monitor liver disorders or haemolytic anaemia. To help detect certain rare genetic disorders in sick babies and avoid brain damage in babies that are markedly jaundiced.

When to get tested?

If your doctor thinks you have symptoms of liver damage, liver disease or haemolytic anaemia.

Sample required?

In adults, a blood sample from a vein in the arm; in newborns, a blood sample from a heel-prick.

Test preparation needed?


What is being tested?

Bilirubin is an orange-yellow pigment which is formed when haemoglobin, the red-coloured pigment of red blood cells that carries oxygen to tissues, breaks down. Bilirubin is ultimately processed by the liver to allow its elimination from the body. Small amounts of bilirubin are present in blood from damaged or old red cells that have died. If bilirubin levels increase in the blood, the appearance of jaundice becomes more evident.

How is the sample collected for testing?

From blood samples. In newborns, blood is often collected from a heel-prick. For adults, blood is typically collected by needle from a vein.

Is any test preparation needed to ensure the quality of the sample?

No test preparation is needed.

The Test

How is it used?

When bilirubin levels are high, a condition called jaundice (a yellowing of the skin and the whites of the eyes) occurs and further testing is needed to determine the cause. Too much bilirubin may mean that too many red cells are being destroyed, or that the liver is incapable of removing bilirubin from the blood.

It is not uncommon to see high bilirubin levels (sometimes called neonatal bilirubin) in newborn babies (typically 2–7 days old). This transient condition is called physiological jaundice and resolves within a few days. Neonatal jaundice is likely to be abnormal if it persists longer than 8 - 14 days or if the conjugated bilirubin fraction is high. Then it could be caused by abnormal metabolism in the liver or malformation of the bile ducts. If the jaundice is present at birth and is caused by an elevated unconjugated bilirubin concentration, the newborn’s red blood cells may be being destroyed because of blood incompatibility between the baby and mother, called haemolytic disease of the newborn.

In adults or older children, bilirubin is measured to diagnose and/or monitor liver diseases (such as cirrhosis, hepatitis, or gallstones). Patients with sickle cell disease or other causes of haemolytic anaemia may have episodes where excessive red blood cell destruction takes place, increasing bilirubin levels.

When is it requested?

A doctor usually orders a bilirubin test in conjunction with other laboratory tests (alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase) for a patient who shows signs of abnormal liver function. A bilirubin level may be ordered when a patient:

  • shows evidence of jaundice
  • has a history of drinking excessive amounts of alcohol
  • has suspected drug toxicity
  • has been exposed to hepatitis viruses

Other symptoms that may be present include:

  • dark, amber-coloured urine
  • nausea/vomiting
  • abdominal pain and/or swelling
  • fatigue and general malaise that often accompany chronic liver disease

Determining a bilirubin level in newborns with jaundice is considered standard medical care.

What does the test result mean?

Excessive bilirubin damages developing brain cells in infants and may cause mental retardation, physical abnormalities or blindness. It is important that bilirubin in newborns does not get too high. When the level of bilirubin is above a critical threshold, special treatment is used to reduce it. An excessive bilirubin level may result from the breakdown of red blood cells (RBCs) due to blood typing incompatibility between the mother and her newborn.

Adults and children
Doctors may request bilirubin tests (along with other tests, especially when jaundice is present) to determine if liver damage exists. 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. This can be done by measuring two different chemical forms of bilirubin — direct (or conjugated) and indirect (or unconjugated) bilirubin. If the direct bilirubin is elevated there may be some kind of blockage of the liver or bile duct, perhaps due to gallstones, hepatitis, trauma, a drug reaction, or long-term alcohol abuse. If the indirect bilirubin is increased, haemolysis (undesirable breakdown of red blood cells) may be the cause.

Reference Intervals

1- 20 umol/L

The reference intervals shown above are known as a harmonised reference interval. This means that eventually all laboratories in Australia will eventually use this same interval so wherever your sample is tested, the reference interval should be the one shown above. Laboratories are in the process of adopting these harmonised intervals so it is possible that the intervals shown on the report of your results for this test may be slightly different until this change is fully adopted. More information can be found under Reference Intervals – An Overview.

Is there anything else I should know?

Although bilirubin may be toxic to brain development in newborns (up to the age of about 2 weeks), high bilirubin in older children and adults does not pose the same threat. In older children and adults, the 'blood-brain barrier' is more developed and prevents bilirubin from crossing this barrier to the brain cells. Elevated bilirubin levels in children or adults, however, strongly suggest a medical condition that must be investigated and treated.

Jaundice results from high levels of bilirubin. Increases in bilirubin may be due to metabolic problems, obstruction of the bile duct, infection, physical or chemical damage to the liver, or an inherited abnormality (Gilbert’s, Rotor’s, Dubin-Johnson or Crigler-Najjar syndromes).

Common Questions

Are some people more at genetic risk of abnormal bilirubin levels?

Several inherited conditions including Gilbert’s syndrome, Dubin-Johnson syndrome, Rotor’s syndrome and Crigler-Najjar syndrome can cause a raised bilirubin level. Of these four syndromes, Crigler-Najjar is the most serious. The first three are usually mild, long-term conditions that can be aggravated under certain conditions but in general cause no significant health problems.

How do you treat abnormal bilirubin levels and/or jaundice?

Treatment depends on the cause of the jaundice. In newborns, phototherapy (special light therapy), blood exchange transfusion, and certain drugs may reduce the bilirubin level. In Gilbert’s, Rotor’s and Dubin-Johnson syndrome, no treatment is usually necessary. Crigler-Najjar syndrome may respond to certain enzyme drug therapy or may require a liver transplant. Jaundice caused by an obstruction, for example gallstones, is often resolved by surgery to remove the blockage. Jaundice due to cirrhosis is often a result of long-term alcohol abuse and may not respond well to any type of therapy, though abstaining from alcohol and ensuring good nutrition may improve the situation if the liver has not been damaged too badly.

Is there anything I can do to maintain healthy bilirubin levels?

While there is no one specific thing, it is clear that excessive and long term alcohol consumption can lead to cirrhosis and a permanently damaged liver. Avoiding excessive alcohol consumption, drug toxicity and eating a proper diet can help sustain a healthy liver.

What are the signs and symptoms of increased bilirubin levels?

The presence of jaundice, dark urine, pale stools and generalised itching may be found in obstructive jaundice.  More severe cases may include severe abdominal pain, anorexia, vomiting and fever.  Increased bilirubin levels may be a sign of another problem, such as cancer, and may be seen in conjunction with swollen glands or an enlarged spleen.

Last Review Date: May 30, 2022

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