How Does Urobilinogen Reach the Urine?
The body regularly breaks down old red blood cells. This process produces a yellow substance called bilirubin.
The liver processes bilirubin and releases it into bile. The bile then passes via the bile ducts into the intestines, where bacteria convert some of the bilirubin to urobilinogen.
Most urobilinogen leaves the body in stool. A smaller amount is absorbed back into the blood, and some of it eventually passes through the kidneys into the urine. This is why a small amount of urobilinogen may normally be present in urine.
A Urobilinogen in Urine Test measures how much urobilinogen is present. It is usually included in the chemical part of a urinalysis rather than performed as a separate test.
What Can This Result Show?
Urobilinogen is produced through a process involving red blood cells, the liver, bile ducts, and intestines. A problem affecting any part of this process may change the amount found in urine.
For example:
- Levels may rise when red blood cells break down faster than usual
- Levels may increase when the liver cannot process urobilinogen properly
- Levels may become low or absent when bile cannot reach the intestines
- Liver, gallbladder, or bile duct conditions may affect the result
The test cannot show the exact cause by itself. Urobilinogen is usually interpreted with urine bilirubin, blood bilirubin, liver function tests, and other findings.
When Might Urobilinogen Be Checked?
A healthcare provider may review urine urobilinogen:
• During a routine urinalysis
• When investigating possible liver disease
• When monitoring an existing liver condition
• If a gallbladder or bile duct problem is suspected
• When an increased red blood cell breakdown is being investigated
• After an abnormal bilirubin reading or liver function result
The test may also be requested if you experience:
• Yellowing of the skin or eyes
• Dark-coloured urine
• Pale or clay-coloured stool
• Feeling extremely tired or weak
• Nausea or vomiting
• Reduced appetite
• Unexplained itching
• Discomfort in the upper right side of the abdomen
• Swelling in the abdomen, ankles, or legs
• Dizziness or a fast heartbeat
These symptoms can occur for many reasons and do not confirm an abnormal urobilinogen level.
Giving a Urine Sample
No special preparation is normally required.
Eat and drink normally unless fasting for another test. Make sure you inform your healthcare provider about any medicines and any supplements you are using. If you are a woman, mention if you’re menstruating. Then you need to follow the instructions for collecting the sample.
Some medicines and supplements may affect the result. Do not stop taking prescribed medicine unless your healthcare provider advises you to do so.
To collect a clean-catch midstream sample: Clean the genital area first, then let the initial urine flow into the toilet before collecting the rest in a sterile container. Close it securely and return it to the laboratory as instructed.
How the Laboratory Checks Urobilinogen
Urobilinogen is commonly checked using a urine dipstick or reagent strip.
The colour change is a sign that the strip has reacted with urobilinogen, and then the colour is compared with a reference scale.
The result may be reported as normal, increased, low, absent, or as an approximate concentration.
This is usually a semi-quantitative test, meaning it gives an estimated amount rather than a precise measurement.
The urinalysis may also check for bilirubin. These two findings provide different information:
• Urobilinogen may normally be present in small amounts.
• Bilirubin is not normally expected in urine.
How Is the Result Reported?
A commonly used reference range for urine urobilinogen is:
• 0.2–1.0 mg/dL
Some laboratories may report the result using descriptive terms instead of numbers. The expected range can also differ according to the dipstick brand, laboratory method, and sample handling.
Always compare the result with the reference range printed on your laboratory report.
The reference ranges vary depending on the laboratory and the methodology used. Individuals must consult their healthcare provider for correct interpretation of the results.
What Can a High Urobilinogen Level Mean?
A high result means that more urobilinogen than expected is passing into the urine.
A high level may reflect poor liver performance and indicate that it is not processing it properly, or that red blood cells are breaking down too quickly. This may happen with liver disease, hepatitis, cirrhosis or haemolytic anaemia. Some medicines can also affect the result, so more tests may be needed to find the cause.
What Can Low or Absent Urobilinogen Mean?
Very little or no urobilinogen may mean that bilirubin is not reaching the intestines in the expected amount.
Possible causes include:
• A blocked bile duct
• Reduced bile flow
• Gallstone presence affecting bile drainage
• Certain gallbladder or bile duct conditions
• Severe cholestasis
• Another problem affecting liver or bile function
A urine test cannot identify the exact cause or location of a blockage.
An absent result should also be interpreted carefully because medicines, sample handling, and limitations of the urine strip may affect the reading.
Why Urine Bilirubin Matters Too
Urobilinogen and urine bilirubin are often considered together because different result patterns may give clues about the bilirubin pathway.
For example:
• High urobilinogen without urine bilirubin may occur when red blood cell breakdown is increased
• High urobilinogen with abnormal liver tests may require investigation for liver disease
• Low or absent urobilinogen with urine bilirubin present may suggest reduced bile flow or bile duct obstruction
These patterns are not diagnoses. Blood bilirubin, liver enzymes, symptoms, and medical history must also be considered.
What Tests May Be Needed Next?
An abnormal urobilinogen result does not identify a condition by itself.
Depending on the result and your symptoms, your healthcare provider may recommend:
• Repeating the urinalysis
• Urine bilirubin testing
• Total and direct blood bilirubin tests
• Liver function tests
• Complete Blood Count
• Haemoglobin and reticulocyte testing
• Peripheral blood smear
• Hepatitis testing
• Ultrasound or other imaging of the liver, gallbladder and bile ducts
Blood tests may be used when increased red blood cell breakdown is suspected. Imaging may be recommended if reduced bile flow or a blockage is possible.
Treatment depends on the underlying liver, blood, gallbladder or bile duct condition rather than the urobilinogen level itself.
Seek prompt medical advice if yellow skin or eyes occur with severe abdominal pain, fever, repeated vomiting, confusion, very dark urine or unusually pale stool.
Book An Appointment
Need a Urobilinogen in Urine Test? Book an appointment with Genex Clinical Laboratories for urinalysis and assessment of urine urobilinogen.
