High bilirubin on a blood test: what it means
Medically Reviewed by Dr. Pedro Yelamo Vera, MD
Licensed Physician No. 484814280 · Official Medical College of Bizkaia (Spain)Last reviewed: 21 October 2026
High bilirubin explained: total, direct and indirect bilirubin, Gilbert's syndrome, when it points to the liver or bile ducts, and when jaundice is urgent.
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Bilirubin is part of the liver tests on many routine blood reports. A slightly high result is common and is often harmless. Sometimes it points to a problem with the liver, the bile ducts or the blood. This guide explains how to read the result and what usually happens next.
- Bilirubin is a yellow pigment made when old red blood cells break down. The liver clears it into the bile.
- A mildly high bilirubin with otherwise normal tests is often Gilbert's syndrome, a common and harmless inherited trait.
- High "direct" bilirubin, or a rise with abnormal liver enzymes, needs a closer look at the liver and bile ducts.
- Yellow skin or eyes with fever, severe belly pain, or confusion need urgent care. In an emergency, call 112.
Dr. Pedro Yelamo Vera is a GP licensed in Spain (Colegiado No. 484814280).
For a medical emergency, call 112 or go to the nearest local emergency department. Do not wait for a video consultation or an online reply.
What bilirubin is
Red blood cells live for about four months. When they break down, the body makes a yellow pigment called bilirubin. The liver takes it up, changes it, and sends it into the bile. It then leaves the body in the stool.
When bilirubin builds up in the blood, the skin and the whites of the eyes can turn yellow. This is called jaundice (ictericia).
The three numbers on your report
A Spanish report may show up to three values, in mg/dL:
| On the report | What it is |
|---|---|
| Bilirrubina total | All the bilirubin in the blood |
| Bilirrubina directa (conjugada) | Bilirubin the liver has already processed |
| Bilirrubina indirecta (no conjugada) | Bilirubin not yet processed by the liver |
Many labs give a total range of up to about 1.0 to 1.2 mg/dL. Reports from the UK use µmol/L. To get µmol/L, multiply mg/dL by about 17.1.
Which part is high helps your doctor think about the cause.
Mostly indirect bilirubin: Gilbert's syndrome and other causes
When the high part is mainly indirect, and the liver enzymes are normal, the most common cause is Gilbert's syndrome. It is an inherited trait. The liver processes bilirubin a little more slowly than usual.
- It is common and harmless.
- Bilirubin may rise when you are ill, fasting, stressed, short of sleep or after hard exercise.
- Some people notice slightly yellow eyes at those times.
- It does not damage the liver and usually needs no treatment.
Less often, high indirect bilirubin comes from red blood cells breaking down faster than normal (haemolysis). A full blood count and a few other tests can check for this. Our guide to the full blood count explains those results.
Mostly direct bilirubin: the liver and bile ducts
When direct bilirubin is high, the problem is more often in the liver or in the bile ducts. Possible causes include:
- Gallstones blocking a bile duct.
- Hepatitis, from viruses, alcohol or some medicines.
- Long-term liver disease.
- Less often, a growth pressing on the bile ducts.
In these cases the liver enzymes are often abnormal too. Read our guide to fatty liver for one common cause of abnormal liver tests.
Have a bilirubin result you are not sure about?
You can book a video visit to go through the results you already have with a GP licensed in Spain, in English or Spanish.
What usually happens next
Your doctor will look at the bilirubin together with the other liver tests, the blood count, your symptoms and your medicines. Common next steps are:
- Repeat the test, ideally when you are well and have not fasted for long.
- Check direct and indirect bilirubin separately, if the report gives only the total.
- Check the liver enzymes and a full blood count.
- Arrange a liver and gallbladder scan (ultrasound) if direct bilirubin is high or enzymes are abnormal.
If the pattern fits Gilbert's syndrome and everything else is normal, often no more tests are needed. It helps to keep a copy of the result. Tell future doctors, so they do not repeat the same tests.
When to get urgent help
Go to an emergency department or call 112 if you have yellow skin or eyes together with:
- Fever and shivering.
- Severe pain in the upper right side of the belly.
- Confusion or great drowsiness.
- Vomiting blood, or black, tarry stools.
New jaundice without these signs still needs a prompt check by a doctor, in person. Dark urine with pale stools is another reason to be seen soon.
Going through your results by video
Dr. Yelamo is a GP licensed in Spain. He can go through results you already have, by video, for adults. Visits run every day, 07:30–20:30 (Spain time). In the visit he will:
- Read the full report, with units, dates and the lab's range.
- Compare it with past results, including ones from other countries.
- Ask about symptoms, alcohol, medicines and family history.
- Explain what the pattern suggests and what is usually checked next.
- Tell you if you need a test, a scan or an exam in person.
He does not promise any test or prescription before the visit. Where clinically appropriate, following a genuine evaluation. Treatment and prescriptions are issued solely at the doctor's discretion based on evidence-based clinical guidelines.
See how the Urgent Care video visit works. It lasts 15 minutes and costs €50.
Frequently asked questions
What is a normal bilirubin level?
Each lab has its own range. For total bilirubin, many labs use up to about 1.0 to 1.2 mg/dL, which is about 17 to 21 µmol/L.
What is Gilbert's syndrome?
A common, harmless inherited trait. The liver processes bilirubin a little slowly, so it can rise during illness, fasting or stress. The liver stays healthy and treatment is usually not needed.
What is the difference between direct and indirect bilirubin?
Direct bilirubin has already been processed by the liver. Indirect has not. A high direct part points more to the liver or bile ducts; a high indirect part often means Gilbert's syndrome.
When is high bilirubin urgent?
When yellow skin or eyes come with fever, severe belly pain, confusion, vomiting blood or black stools. Call 112 or go to an emergency department.
Can an online GP go through my bilirubin result?
Yes. Dr. Yelamo can go through results you already have by video, for adults. He explains the pattern and tells you if you need a scan or an exam in person.
Sources
- NHS: Gilbert's syndrome
- NHS: Jaundice
- NHS: Liver disease
- NICE guideline NG49: Non-alcoholic fatty liver disease, assessment and management
Related guides
Medical Citations & Sources
This content is written and reviewed by a licensed physician with reference to the following official health authorities.
