Direct answer
The bilirubin test is a blood test that measures bilirubin, the yellow pigment formed when red blood cells break down. The bilirubin test reports total, direct (conjugated) and indirect (unconjugated) fractions, and helps doctors work out why a person looks jaundiced, whether the cause lies in blood cell breakdown, the liver cells, or the bile ducts.
Key takeaways
- The bilirubin test measures a pigment, not liver damage, it shows a pattern, not a diagnosis.
- A raised indirect fraction points towards red cell breakdown, Gilbert syndrome or newborn jaundice; a raised direct fraction points towards liver cell or bile duct problems.
- A normal bilirubin result does not exclude liver disease, including cirrhosis, hepatitis or fatty liver.
- The bilirubin test cannot show where a bile duct is blocked, imaging is needed for that.
- In newborns, bilirubin values are interpreted against hour-specific charts and gestational age, never against adult ranges.
At a glance
| Test name | Serum bilirubin (total, direct, indirect) |
|---|---|
| Sample | Venous blood; heel-prick in newborns; transcutaneous meter used as a screen in some nurseries |
| Time for the blood draw | Usually 2-5 minutes |
| Total visit time | Commonly 15-30 minutes including registration and waiting |
| Fasting | Usually not required for bilirubin alone; may be needed if bundled with lipid or glucose tests |
| Usually part of | Liver function test (LFT) panel, alongside SGPT/ALT, SGOT/AST, ALP, GGT, albumin, protein |
| Cannot assess | Site of bile duct obstruction, degree of fibrosis, cause of liver injury |
| Interpretation | Only by the doctor who requested the test, in clinical context. Results vary depending on individual clinical circumstances. |
Also known as
- Serum bilirubin; S. bilirubin
- Total and direct bilirubin; T Bil / D Bil
- Peelia test or jaundice test in everyday Indian usage
- TSB (total serum bilirubin) in newborn care; TcB for transcutaneous bilirubin screening
- Part of the LFT or liver profile, often written with SGPT and SGOT
What the bilirubin test is
Red blood cells live roughly four months. When they are broken down, the haem inside them is converted to bilirubin. This unconjugated (indirect) bilirubin travels in the blood bound to albumin, is taken up by liver cells, joined to a sugar molecule to become conjugated (direct) bilirubin, and then passed into bile and out through the gut.
The laboratory measures total bilirubin and direct bilirubin. Indirect bilirubin is calculated by subtraction, not measured separately. Because it is a calculated number, small analytical variations in the two measured values can shift it.
Bilirubin rises when any step in that chain is overloaded or interrupted: too much red cell breakdown, reduced liver uptake or conjugation, liver cell injury, or obstructed bile flow.
Why the bilirubin test is done
- To investigate jaundice: yellow eyes or skin, dark urine, pale stools.
- To classify jaundice: a predominantly indirect rise suggests haemolysis or a conjugation problem; a predominantly direct rise suggests hepatocellular or biliary disease.
- To monitor known liver disease: bilirubin is a component of severity scores used in chronic liver disease and in assessing acute liver injury.
- To monitor newborn jaundice and decide whether phototherapy or further treatment is needed.
- To help assess suspected haemolysis, usually alongside haemoglobin, reticulocyte count and LDH.
- To monitor drug safety: for example during anti-tubercular therapy, methotrexate or certain chemotherapy, as part of an LFT panel.
Who should get this test
- Anyone with yellowing of the eyes or skin, itching without rash, dark (tea-coloured) urine or clay-coloured stools.
- People with suspected viral hepatitis, including hepatitis A and hepatitis E, which remain common in India.
- People on medicines with known liver effects, including anti-tubercular drugs, and those taking herbal, AYUSH or gym or weight-loss supplements, a recognised cause of drug-induced liver injury.
- Newborns with visible jaundice, jaundice appearing in the first 24 hours, prematurity, blood group incompatibility with the mother, poor feeding or excessive sleepiness.
- People with known or suspected haemolytic conditions, thalassaemia, sickle cell disease, G6PD deficiency, autoimmune haemolysis.
- People with gallstones, previous biliary surgery, abdominal pain with fever, or unexplained weight loss.
- People with chronic liver disease, for scheduled monitoring as advised by their treating doctor.
The bilirubin test is not a useful general screening test in a person without symptoms or risk factors. It is usually requested as part of an LFT panel rather than alone.
What the bilirubin test cannot detect or exclude
- It cannot exclude liver disease. Bilirubin is often normal in compensated cirrhosis, chronic hepatitis B or C, and in steatotic liver disease (MASLD, previously called NAFLD). A normal bilirubin does not mean the liver is healthy.
- It cannot localise an obstruction. A raised direct bilirubin does not say whether the cause is a stone in the common bile duct, a stricture or a tumour. Ultrasound, MRCP, CT or endoscopic imaging is required.
- It cannot measure fibrosis or cirrhosis. Elastography, imaging, fibrosis scores or biopsy are used for that.
- It cannot identify the cause of liver injury. Viral serology, autoimmune markers, iron and copper studies, drug history and imaging are needed.
- It cannot confirm haemolysis on its own. Haemoglobin, reticulocyte count, LDH, haptoglobin and peripheral smear are required.
- It cannot diagnose Gilbert syndrome by itself, although a mild isolated indirect rise with otherwise normal tests is the usual pattern.
- It cannot grade how ill a newborn is without reference to age in hours, gestation and risk factors.
A value reported as normal or as "not raised" describes what the sample showed at that moment. If symptoms persist despite a normal result, go back to your doctor rather than assuming the problem has been excluded.
Related but different tests
| Test | Question it answers | What it does not do |
|---|---|---|
| Bilirubin (total, direct, indirect) | Is bilirubin accumulating, and in which fraction? | Does not show cause, site or severity of liver damage |
| SGPT/ALT and SGOT/AST | Are liver cells being injured? | Can be normal in cirrhosis; do not reflect liver function |
| ALP and GGT | Is there a cholestatic or biliary pattern? | ALP also rises from bone; GGT is non-specific |
| Albumin and prothrombin time/INR | How well is the liver performing its synthetic work? | Affected by nutrition, sepsis, anticoagulants, vitamin K status |
| Urine bilirubin / urobilinogen | Is conjugated bilirubin spilling into urine? | Semi-quantitative; degrades on standing |
| Transcutaneous bilirubin (TcB) in newborns | Screening estimate without a needle | Not a substitute for serum bilirubin at or near treatment thresholds, or after phototherapy |
| USG abdomen (sonography) | Are the bile ducts dilated? Are there gallstones? | Can miss small common bile duct stones; may be limited by bowel gas or body habitus |
| MRCP | Detailed map of the biliary tree | Not a first test for jaundice; requires MRI safety assessment for implants |
Which test comes first depends on the clinical problem. In painless jaundice with a direct-predominant rise, imaging of the biliary tree usually follows quickly. In a young adult with mild isolated indirect hyperbilirubinaemia and no symptoms, repeat testing and a careful history may be all that is needed. In a newborn, hour-specific bilirubin measurement takes priority over everything else.
How to prepare
Preparation instructions are operational and vary between laboratories and hospitals. Your own unit's written instructions take precedence over anything on this page.
- Fasting: bilirubin alone usually does not need fasting. Fasting is often requested only because the bilirubin test is bundled with lipid or glucose tests. Prolonged fasting can itself raise indirect bilirubin, especially in Gilbert syndrome.
- Medicines and supplements: tell the laboratory and your doctor about everything you take, including painkillers, antibiotics, anti-tubercular drugs, contraceptives, protein powders, and AYUSH or herbal preparations. Do not stop any prescribed medicine to "get a better result", speak to the prescriber first.
- Alcohol: tell your doctor about recent alcohol use so the result can be read correctly.
- Hydration: normal water intake makes the blood draw easier, unless you have been given a fluid restriction.
- Sample handling: bilirubin is light-sensitive, so laboratories protect the sample from light. This is the laboratory's responsibility, not yours.
If you are pregnant
Jaundice or itching in pregnancy needs prompt medical assessment rather than self-monitoring. Bile acids and other tests are usually added. Do not fast for long periods in pregnancy unless specifically instructed.
If you have diabetes on glucose-lowering treatment
Extended fasting carries a risk of hypoglycaemia with insulin or sulfonylureas. Ask your prescriber how to time the test and your medication. Early-morning appointments are usually preferred.
If you have chronic kidney disease, heart failure or a fluid restriction
Do not increase fluid intake beyond your prescribed limit for any blood test. Follow the limit set by your treating team.
Infants and children
Children are not routinely fasted for a bilirubin test. Newborn sampling is timed by age in hours, not by feeds. Feeding may continue as advised by the neonatal team.
Older adults
Veins can be fragile and bruising is more likely. Mention anticoagulants or antiplatelet medicines before the draw so pressure can be applied for longer.
What happens during the test
A phlebotomist cleans the skin, applies a tourniquet and draws blood from a vein, usually in the forearm or the back of the hand. Pressure is applied afterwards. In newborns, a heel-prick is used, or a transcutaneous meter is placed briefly on the forehead or chest as a screen.
How long it takes: the draw itself is typically 2-5 minutes. A full outpatient visit is commonly 15-30 minutes. Newborn heel-prick sampling takes a few minutes; transcutaneous screening takes under a minute. Reporting times differ by laboratory and by whether the test is routine or urgent, ask your unit.
Understanding your bilirubin report
Reference intervals differ between laboratories because methods and analysers differ. Always read your value against the range printed on your own report, not against a range from another lab or website. Units in India are usually mg/dL; some laboratories report 祄ol/L.
What matters more than a single number is the pattern:
- Indirect-predominant rise, normal SGPT/SGOT and ALP: commonly Gilbert syndrome, haemolysis, resolving haematoma, or ineffective red cell production. Thalassaemia trait, G6PD deficiency and sickle cell disease are relevant in the Indian population.
- Direct-predominant rise with high ALP and GGT: a cholestatic pattern, gallstone in the bile duct, stricture, drug-induced cholestasis, or a mass compressing the duct.
- Raised bilirubin with markedly raised SGPT/SGOT: a hepatocellular pattern, viral hepatitis including hepatitis A and E, drug or supplement injury, alcohol-related liver disease, ischaemia.
- Raised bilirubin with prolonged INR, low albumin or confusion: suggests impaired liver function and needs urgent medical review.
- Low bilirubin: not a disease and not a deficiency. It needs no treatment.
Visible jaundice generally appears only once bilirubin is well above the upper reference limit, so mild elevations often cause no yellowing at all. A raised bilirubin is not itself a diagnosis, and the same number can mean very different things in different people. Only the doctor who requested the test can interpret it alongside your history, examination and other results.
Newborn reports
Newborn bilirubin values are plotted on hour-specific charts that also account for gestational age and risk factors such as haemolysis. A value that is entirely acceptable at 72 hours may need treatment at 24 hours. Do not compare a newborn's value with adult reference ranges or with another baby's report.
When bilirubin results can be misleading
Falsely raised or spuriously high
- Haemolysis of the sample during a difficult draw or rough transport can disturb bilirubin measurement.
- Prolonged fasting, dehydration, strenuous exercise or acute illness can raise indirect bilirubin, particularly in Gilbert syndrome.
- Some medicines interfere with liver uptake or with the assay itself, raising the reported value without liver injury. Atazanavir, rifampicin and certain other drugs are recognised examples.
- Lipaemic (fatty) or turbid samples can interfere with some spectrophotometric methods.
- Resolving large bruises or after a blood transfusion, extra red cell breakdown transiently raises indirect bilirubin.
Falsely lowered or misleadingly normal
- Light exposure degrades bilirubin in the sample, lowering the measured value.
- Delayed processing can reduce the value.
- Established cirrhosis can exist with a completely normal bilirubin until decompensation, the commonest false reassurance from this test.
- Transcutaneous readings in newborns tend to be unreliable after phototherapy has begun and in babies with deeply pigmented skin; serum measurement is used when decisions depend on the number.
- Intermittent obstruction, such as a stone that moves, can give a normal bilirubin between episodes.
Risks and safety
Venous blood draw in adults and older children
Minor and uncommon: bruising, brief pain, light-headedness, and rarely a small haematoma or local infection. Bleeding lasts longer if you take anticoagulants. Tell the phlebotomist if you have fainted during previous blood tests.
Heel-prick in newborns
Brief pain and a small bruise are usual; local infection is rare. Repeated sampling over days can cause soreness, which is why nurseries space samples according to clinical need.
Transcutaneous bilirubin screening
No needle and no skin breach, so physical risk is negligible. The trade-off is accuracy rather than safety, readings near treatment thresholds are confirmed with a blood sample.
Results vary depending on individual clinical circumstances.
Red flags
Emergency now
- Jaundice with confusion, drowsiness, slurred speech, disorientation or abnormal behaviour.
- Vomiting blood, or black tarry stools.
- Jaundice with high fever, rigors and severe upper abdominal pain.
- Newborn who is deeply yellow, difficult to wake, feeding poorly, has a high-pitched cry, arching or stiffness, or jaundice within the first 24 hours of life.
- Jaundice with breathlessness, very low blood pressure or reduced urine output.
Same day
- New jaundice, dark urine or pale stools, with or without pain.
- Jaundice with intense generalised itching, especially in pregnancy.
- Jaundice appearing while on anti-tubercular therapy, new medicines, or herbal or gym supplements.
- Rapidly worsening yellowing in a newborn at home, or jaundice persisting beyond two weeks.
- Jaundice with marked pallor, fatigue or dark cola-coloured urine, suggesting brisk haemolysis.
Routine appointment
- Mildly raised bilirubin found incidentally, with no symptoms and otherwise normal liver tests.
- A long-standing, stable, mildly raised indirect bilirubin already explained by your doctor.
- Scheduled monitoring of known chronic liver disease.
Special situations
Pregnancy
Jaundice or significant itching in pregnancy is never ignored. Causes range from intrahepatic cholestasis of pregnancy to viral hepatitis, hepatitis E can be particularly severe in pregnancy in India, and to HELLP syndrome or acute fatty liver of pregnancy. Bilirubin is interpreted with bile acids, liver enzymes, platelet count and blood pressure.
Newborns and infants
Most newborn jaundice is physiological and settles. Treatment decisions rest on hour-specific bilirubin thresholds, gestational age and risk factors, not on appearance alone. Jaundice with a raised direct fraction, or jaundice lasting beyond two weeks, needs investigation for causes such as biliary atresia, where early diagnosis matters. Exclusive breastfeeding should continue unless the neonatal team advises otherwise.
Children
Jaundice in an older child raises questions of viral hepatitis, haemolysis, drug effect and inherited liver disease. Sampling volumes are adjusted for size.
Older adults
Painless jaundice with weight loss in an older adult needs prompt imaging. Multiple medicines make drug-related cholestasis more likely.
People with haemoglobinopathies
Thalassaemia, sickle cell disease and G6PD deficiency cause chronic indirect hyperbilirubinaemia and a raised risk of pigment gallstones. A "high bilirubin" report in these individuals should be compared with their own previous values.
People with chronic kidney disease or heart failure
Avoid prolonged fasting and do not exceed a prescribed fluid limit. In heart failure, congestion of the liver can itself raise bilirubin without primary liver disease.
The bilirubin test in the Indian context
- Nomenclature: the bilirubin test almost always appears within an LFT that reports SGPT (ALT) and SGOT (AST). Many reports use both sets of names.
- Hepatitis A and E are frequent causes of acute jaundice in India, often linked to contaminated water or food. Hepatitis E in pregnancy warrants particularly careful assessment.
- Anti-tubercular therapy is widely used, and drug-induced liver injury is a recognised complication. Jaundice on treatment requires review by the treating doctor rather than self-adjustment of tablets.
- Herbal, AYUSH and gym or weight-loss supplements are an under-reported cause of liver injury. Bring the actual packs to the consultation.
- Haemoglobinopathies including beta-thalassaemia trait and sickle cell disease are common in several regions and shift the indirect fraction upward.
- Metabolic liver disease at lower BMI: South Asians develop steatotic liver disease (MASLD) at lower body weights than many other populations. Bilirubin is usually normal in early MASLD, so a normal bilirubin should not be taken as reassurance.
- Terminology update: NAFLD is now MASLD and NASH is MASH, with steatotic liver disease as the umbrella term and MetALD describing coexisting metabolic and alcohol-related disease (multi-society Delphi consensus, Rinella et al., 2023).
- Turmeric, beetroot and carotene-rich foods can tint the skin but do not cause yellowing of the white of the eye and do not raise bilirubin. Yellow eyes need assessment.
Cost and insurance in India
Costs differ widely between government facilities, standalone laboratories and corporate hospitals, so ask for a written quotation before testing rather than relying on published figures.
What affects the price:
- Whether only bilirubin is tested or a full LFT or comprehensive liver panel.
- City and type of facility; home collection and phlebotomy charges.
- Urgent or after-hours processing, and repeat testing for monitoring.
- Whether the test is part of a package, health check or maternity plan.
- Add-on investigations often needed for jaundice, viral serology, ultrasound, coagulation profile.
Insurance: outpatient diagnostics are frequently excluded from basic indemnity policies but may be covered under OPD riders or wellness benefits. During an admitted hospital stay, investigations are usually part of the claim. Government schemes may cover testing at empanelled centres. Confirm with your insurer beforehand. Under the Digital Personal Data Protection Act 2023, laboratories must handle your health data and consent appropriately, ask how your report will be shared and stored.
Myths and facts
| Myth | Fact |
|---|---|
| A normal bilirubin means the liver is fine. | Bilirubin is often normal in cirrhosis, chronic hepatitis and MASLD. It is a late marker of dysfunction. |
| Any raised bilirubin means liver disease. | A mild isolated indirect rise is frequently Gilbert syndrome or mild haemolysis, with a normal liver. |
| Jaundice can be cured by herbal drops or ritual remedies. | There is no evidence for such claims, and some herbal products themselves injure the liver. Promoting such cures also falls foul of the Drugs and Magic Remedies (Objectionable Advertisements) Act, 1954. |
| All newborn jaundice needs treatment. | Most newborn jaundice resolves without treatment. Decisions follow hour-specific thresholds and risk factors. |
| Sunlight through a window treats newborn jaundice. | Direct sun exposure is not a recommended treatment and risks burning and overheating. Phototherapy uses controlled wavelengths under supervision. |
| You must fast 12 hours for a bilirubin test. | Bilirubin alone usually needs no fasting, and prolonged fasting can itself raise the value. Follow your laboratory's instruction. |
| Stopping all medicines before the test gives a truer result. | Never stop a prescribed medicine for a test. Tell your doctor what you take so the result is interpreted correctly. |
Frequently asked questions
Can my bilirubin be high even if I do not look yellow?
Yes. Yellowing of the eyes usually becomes visible only once bilirubin rises well above the upper reference limit. Mild elevations, such as those in Gilbert syndrome, commonly cause no visible change at all and are picked up incidentally on a routine LFT.
What is the difference between direct and indirect bilirubin on my report?
Direct (conjugated) bilirubin has already been processed by liver cells, so a direct-predominant rise points towards liver cell or bile duct problems. Indirect (unconjugated) bilirubin has not been processed, so an indirect-predominant rise suggests increased red cell breakdown or a conjugation issue such as Gilbert syndrome.
Does a high bilirubin always mean I need a liver biopsy?
No. Most raised bilirubin results are investigated first with a full LFT, viral hepatitis tests, blood counts and a USG abdomen. Biopsy is reserved for specific situations where less invasive tests have not answered the question. Your treating doctor decides based on the overall picture.
Is fasting necessary before a bilirubin test?
Usually not for bilirubin alone. Fasting is often requested because the test is bundled with lipid or glucose tests. Prolonged fasting can itself raise indirect bilirubin. Follow the instruction given by your own laboratory, and speak to your prescriber if you take insulin or sulfonylureas.
How is a bilirubin test different from an LFT?
Bilirubin is one component of an LFT. The LFT panel adds SGPT/ALT and SGOT/AST for liver cell injury, ALP and GGT for a biliary pattern, and albumin and protein for synthetic function. Bilirubin alone gives a narrow picture and is rarely interpreted in isolation.
My baby's bilirubin is higher than the adult range on the report. Is that dangerous?
Adult reference ranges do not apply to newborns. Newborn values are plotted against age in hours, gestational age and risk factors. A number that needs phototherapy on day one may be perfectly acceptable on day four. The neonatal team's assessment is what counts.
Can medicines or supplements raise bilirubin?
Yes. Some drugs interfere with bilirubin uptake or with the assay, and others cause genuine liver injury or cholestasis. Anti-tubercular drugs, certain antibiotics, and herbal, AYUSH and gym supplements are relevant examples. List everything you take, and never stop a prescribed medicine without speaking to the prescriber.
Do I need to repeat the test if my result is borderline?
Often yes. Bilirubin fluctuates with fasting, illness and hydration, so a single borderline value may not mean much. Your doctor may repeat it with a full LFT after a few weeks, or investigate sooner if you have symptoms or other abnormal results.
How long does the whole process take?
The blood draw itself takes about 2-5 minutes, and a typical outpatient visit 15-30 minutes including registration. Newborn heel-prick sampling takes a few minutes and transcutaneous screening under a minute. Reporting time depends on your laboratory and on whether the sample is marked urgent.
Sources
- Rinella ME et al. A multi-society Delphi consensus statement on new fatty liver disease nomenclature, 2023.
- American Academy of Pediatrics, clinical practice guideline on the management of hyperbilirubinaemia in the newborn infant 35 or more weeks of gestation.
- National Institute for Health and Care Excellence, jaundice in newborn babies under 28 days.
- World Health Organization, hepatitis A and hepatitis E fact sheets.
- Government of India, Digital Personal Data Protection Act, 2023; Drugs and Magic Remedies (Objectionable Advertisements) Act, 1954.
