Gilbert's syndrome: symptoms, tests and how to lower bilirubin

Your bilirubin is slightly high, your liver enzymes are fine, the ultrasound is clear, and the doctor says: "Looks like Gilbert's syndrome." First comes worry, because it sounds like a liver problem. Then comes the search for treatment. In fact, the news is mostly good. It's an inherited quirk in how your body processes bilirubin, not a liver disease.

Below we explain where the syndrome comes from, how it's passed on, what symptoms it causes, how blood tests and a genetic test confirm it, what raises bilirubin and how to live so the yellow tinge shows up less often. No strict diets and no unnecessary pills.

Bilirubin is a yellow pigment made when old red blood cells break down. At first it's "unconjugated", meaning it doesn't dissolve in water. The liver attaches it to glucuronic acid, turning it into "conjugated" bilirubin, and clears it into the bile. An enzyme called UGT1A1 does this job.

Gilbert's syndrome is linked to changes in the UGT1A1 gene, which carries the instructions for this enzyme. According to MedlinePlus Genetics, people with the syndrome have about 30% of normal enzyme activity. The liver handles most of the bilirubin, but not all of it. So unconjugated bilirubin in the blood runs a little above normal.

The liver itself stays healthy. Its cells aren't damaged, bile flows normally, and ALT and AST stay within range. The syndrome is very common: MedlinePlus estimates it affects about 3-7% of people in the US. It's usually found in the teenage years, or by chance when an adult has blood tests for something else.

You inherit it from your parents. The most common variant is a change called UGT1A1*28 in the part of the gene that controls its activity. It follows an autosomal recessive pattern: to have the syndrome, you need an altered copy of the gene from both your mother and your father. The parents may each carry one copy and have no signs at all.

Here's how a genetic report puts it. If both copies are altered, it says homozygous, and the syndrome is genetically confirmed. If one copy is altered (heterozygous), bilirubin is usually normal or only slightly raised. Less often, other gene changes are passed on from just one parent.

There's another twist. Not everyone with two altered copies actually has high bilirubin. Other genes, sex, diet and weight also play a part. That's why your doctor always reads the test result together with your blood work. The NHS notes that the syndrome is more common in men and in people with type 1 diabetes.

If one family member has the syndrome, brothers and sisters can simply get a bilirubin blood test. A genetic test for every relative isn't necessary.

About 30% of people with the syndrome have no symptoms at all, says MedlinePlus Genetics. They find out by chance from a blood chemistry test. Others get mild jaundice now and then.

The most common signs

• a yellowish tint to the whites of the eyes that comes and goes within a few days
• slightly yellow skin, barely visible on darker skin
• tiredness, feeling "run down" on days when bilirubin is higher
• belly discomfort, sometimes nausea

The symptoms are usually mild and go away on their own. Dark urine, pale stools and strong itching are not typical. According to the NHS, if you have them, the jaundice is probably caused by something else, and you should see a doctor soon. That's why doctors rule out hepatitis, bile duct problems and red blood cell breakdown before making the diagnosis.

You may also see it called "Gilbert's disease". It's the same thing. Doctors call it a syndrome because it's a set of signs, not one.

What raises bilirubin

Bilirubin isn't high all the time. It spikes when your body is under strain. Typical triggers:

• fasting, long gaps between meals, strict diets
• dehydration, especially in hot weather or after a workout
• colds, flu, any infection with a fever
• too much exercise and too little sleep
• stress, alcohol, and in women sometimes menstruation

It helps to keep short notes: when the yellow tinge appeared, what came before it, how long it lasted. After a few months you'll see your own triggers, and they get easier to avoid. These notes also help your doctor tell a familiar episode from something new.

If your doctor suspects Gilbert's syndrome, a bilirubin blood test comes first. The diagnosis rests on a pattern, not a single number. The typical picture: raised, mostly unconjugated bilirubin, while conjugated bilirubin, ALT, AST, GGT and alkaline phosphatase are normal. The complete blood count is normal too, with no signs of red cell breakdown.

For conditions like this, where the unconjugated type dominates, the MSD Manual gives a reference point: total bilirubin is usually below 59 micromol/L, there's no bilirubin in the urine, and liver enzymes are normal. We covered normal ranges and how to prepare in our article on bilirubin and liver function tests.

Gilbert's syndrome doesn't need a biopsy. It's usually confirmed step by step. The first step is blood chemistry: total, conjugated and unconjugated bilirubin, ALT, AST, GGT and alkaline phosphatase. A complete blood count with reticulocytes rules out hemolysis, and an ultrasound of the liver and bile ducts rules out other causes. If your doctor orders it, the test is repeated a few weeks later or after a short fast. A genetic test is added if needed.

Genetic test for Gilbert's syndrome

The test looks for UGT1A1 variants in a blood sample or a cheek swab. You don't need it if the picture is typical. It's useful when bilirubin is high and other causes aren't fully ruled out, when you're prescribed drugs that UGT1A1 helps break down, or when you simply want a clear answer and to close the question for good.

You can have these tests done at Oberig clinic's own lab. A nurse draws blood from a vein in a few minutes. Blood chemistry results are usually ready in 1-2 working days, and urgent cito testing takes a few hours. Results go to your personal online account. See the full list of tests on our laboratory diagnostics page.

The key point: the syndrome doesn't harm your liver. The NHS says it plainly: it doesn't damage the liver, usually causes no serious health problems and doesn't affect how long you live. The only documented risk is a slightly higher chance of gallstones.

In practice, two things matter. The first is medicines. UGT1A1 helps break down some drugs, including certain cancer medicines, and statins may need closer monitoring. So tell any doctor who prescribes something new about your syndrome. The second is not mixing it up with other conditions when the yellow tinge suddenly gets stronger or won't fade. Then you need tests, not waiting.

No. There's no specific treatment and none is needed. It isn't a disease to cure but a trait you live with. Doctors don't treat the syndrome itself. They only deal with the rare episodes when you feel unwell.

In those rare cases, when bilirubin climbs noticeably and you feel poorly, a doctor decides on treatment. They may suggest drugs that speed up bilirubin processing in the liver or ones that improve bile flow. Don't pick these yourself. "Hepatoprotectors", herbal blends and "detox cleanses" don't normalize bilirubin, and some supplements put extra strain on the liver.

How to lower bilirubin without pills

Your daily routine affects bilirubin the most. Eat regularly, without long gaps or fasting. Drink enough water, especially in the heat and during workouts. Get enough sleep. Cut back on alcohol. When you have a cold, don't starve yourself, even with no appetite: smaller, more frequent meals work better. These simple steps are usually enough to make the yellow tinge less frequent.

The syndrome doesn't call for a special diet. Food bans around it are mostly myths, and strict limits do more harm than good. Fasting and crash diets are exactly what push bilirubin up.

What really works is regular meals 3-5 times a day, without skipping breakfast. The diet itself is normal and balanced: vegetables, fruit, grains, meat, fish, dairy. Drink enough fluids throughout the day. Keep alcohol to a minimum, or better avoid it. If you need to lose weight, do it gradually and without fasting.

Fatty and fried foods aren't banned "because of the syndrome". But if you also have gallstones, your doctor may advise cutting back on them.

Normally. You can play sports, work, get pregnant and have children, and travel. Just know your triggers, and don't be surprised if your eyes look a bit yellow after a sleepless week or the flu.

A few practical tips. Keep the test results that show raised unconjugated bilirubin with otherwise normal liver tests. Tell doctors about the syndrome before surgery and new medicines. And if the yellow tinge is stronger than usual or doesn't fade within a few days, get tested again so you don't miss another cause.

Children, teenagers and pregnancy

In children, the syndrome is usually noticed in the teenage years, when hormonal changes affect how bilirubin is processed. It often happens after a cold or during exams: parents see yellowish eyes and get scared. A child with such an episode needs a pediatrician's exam and blood tests to rule out hepatitis and blood disorders. Once the diagnosis is confirmed, there's no need to limit sports or food. Just make sure your child doesn't skip breakfast and drinks enough water.

The syndrome doesn't complicate pregnancy or affect the baby's development. Your obstetrician should know about it to read your blood tests correctly. During morning sickness, when eating is hard, bilirubin may rise. Talk this through with your doctor too.

Can I play sports?

Yes. Just avoid exhausting workouts on an empty stomach and drink enough water. Moderate activity is fine. Very hard exercise may raise bilirubin for a while.

Do I need regular blood tests?

The syndrome doesn't require routine monitoring. Get retested if the yellow tinge is stronger than usual, lasts more than a few days or comes with new symptoms.

Will my child inherit it?

Possibly. But your child would need an altered copy of the gene from both parents. Even then, it poses no threat to their health.

Is there a cure?

There is currently no cure, and you don't need one. The NHS points out that the syndrome doesn't damage the liver. What you can do is keep episodes rare by eating regularly, drinking enough and sleeping well.

Can I drink coffee?

Yes, coffee is fine. What matters more is not replacing breakfast with it and not drinking it on an empty stomach instead of food.

Does it raise the risk of liver disease?

No. The syndrome doesn't turn into hepatitis or cirrhosis. Only the risk of gallstones is slightly higher.

Which doctor should I see?

A gastroenterologist or hepatologist. You can also start with a general practitioner, who will order basic tests.

Come in for a consultation if your blood test shows raised bilirubin and you don't know why, or if your eyes turn yellow from time to time. A hepatologist at Oberig clinic's Gastro Center will review your results, order an ultrasound and genetic test if needed, rule out other causes and explain how to live with the syndrome without needless limits. Our Gastro Center doctors follow the standards of the European and American liver associations (EASL and AASLD).

Book by phone at +38 044 521 30 03 or online.