How to Lower Urobilinogen in Your Urine

Elevated urobilinogen on a urine dipstick is a downstream signal, not a standalone problem, so “lowering” it means identifying and addressing whatever is driving the number up. The most common culprits are increased red blood cell breakdown, liver stress, or sluggish bowel transit that lets the gut reabsorb more pigment than usual. In some cases, the reading is not even real: certain medications and metabolic conditions produce false positives on standard test strips. Before chasing the number itself, it helps to understand where urobilinogen comes from and what an elevated result is actually telling you.

Where Urobilinogen Comes From

Your body constantly recycles old red blood cells. When those cells break down, the hemoglobin inside them is converted into bilirubin, which the liver processes and sends into the intestine through bile. Once in the gut, bacteria convert that bilirubin into a family of compounds called urobilinoids, one of which is urobilinogen. Most of it stays in the intestine and is further converted into stercobilin, the pigment that gives stool its brown color.¹ A small portion, though, gets reabsorbed from the intestine back into the bloodstream, filtered by the kidneys, and excreted in urine. That trace amount is what a dipstick test detects. A healthy result is a low but present reading, typically around 0.2 to 1.0 mg/dL. Anything above that range prompts a closer look.

Three Main Reasons It Goes Up

An elevated urobilinogen reading generally points to one of three situations, and the strategy for bringing it down depends entirely on which one applies.

Excess Red Blood Cell Breakdown

When red blood cells are destroyed faster than normal, more heme is released, more bilirubin is produced, and more urobilinogen eventually ends up in the gut and then the urine. This accelerated destruction is called hemolysis, and it is a hallmark of hemolytic anemias. Lab confirmation typically shows elevated indirect bilirubin, increased urobilinogen in both stool and urine, and a bone marrow working overtime to replace the lost cells.² In this scenario, bringing urobilinogen down means slowing the hemolysis itself, which is a medical issue rather than a lifestyle one.

Liver Problems

The liver sits at the center of bilirubin metabolism. When it is inflamed or damaged, its ability to process and excrete bilirubin can become erratic. More unconjugated bilirubin may circulate, more may reach the intestine for bacterial conversion, and the liver’s reduced capacity to recapture reabsorbed urobilinogen means more of it spills into urine. Hepatitis, cirrhosis, and drug-induced liver injury are common causes. However, urine dipstick results for urobilinogen are not especially precise tools for diagnosing liver disease on their own. One study found that the positive predictive value of urine urobilinogen for detecting at least one liver function test abnormality was in the range of about 83 to 86 percent, with sensitivity for abnormalities beyond serum bilirubin dropping to roughly 43 to 53 percent.³ In other words, an elevated urobilinogen result raises suspicion but does not pinpoint the problem. A full liver panel is what clinches the diagnosis.

Slow Bowel Transit

This is the cause that surprises most people. When stool sits in the colon for an extended period, the gut has more time to reabsorb urobilinogen back into the bloodstream, and the kidneys then filter out a higher-than-usual amount. Chronic constipation can produce noticeably elevated urine urobilinogen even when the liver is perfectly healthy and red blood cell turnover is normal. A case report documented exactly this scenario in a child with long-standing constipation: urine showed elevated bilirubin and urobilinogen, yet serum bilirubin and liver enzymes were completely normal.⁴ The fix in that situation was straightforward: resolve the constipation and the urine normalizes.

Make Sure the Result Is Real

Before doing anything to lower urobilinogen, you should know that the standard dipstick test can be fooled. The chemical reaction used on most test strips relies on Ehrlich’s reagent, which reacts with urobilinogen to produce a color change. The problem is that other compounds react with the same reagent and generate a false-positive result.

The most clinically significant false positive comes from porphobilinogen, or PBG, a substance that accumulates during acute attacks of certain porphyrias. Researchers found that patients with acute hepatic porphyria showed dramatically elevated “urobilinogen” on dipstick testing, but the reading was entirely due to PBG reacting with Ehrlich’s reagent rather than actual urobilinogen being present.⁵ Beyond porphyria, several common medications can also trigger the same reaction. Sulfonamide antibiotics, p-aminosalicylic acid, and drugs containing azo dyes, including nitrofurantoin, riboflavin, and methyldopa, are known interferents.⁵ If you are taking any of those and got an elevated urobilinogen result, it may be worth repeating the test or asking your doctor whether the reading could be an artifact.

Addressing Hemolytic Conditions

If hemolysis is behind your elevated urobilinogen, lowering the number requires medical treatment targeted at whatever is destroying your red blood cells. The underlying conditions range widely: autoimmune hemolytic anemia, sickle cell disease, thalassemia, enzyme deficiencies like pyruvate kinase deficiency, and infections such as malaria. Each has its own treatment pathway, from immunosuppressive drugs to blood transfusions to antimalarials.

One encouraging area of research involves pyruvate kinase activators, a newer class of drugs designed for hemolytic anemias caused by enzyme deficiency. A systematic review of these agents found that most studies reported improvements in bilirubin, lactate dehydrogenase, haptoglobin, and reticulocyte levels, all markers that track with the degree of red blood cell destruction.⁶ When hemolysis slows, bilirubin production drops, and urobilinogen follows. But these are prescription therapies guided by a hematologist, not something you manage on your own.

Supporting Your Liver

When liver dysfunction is the culprit, “lowering urobilinogen” is really about reducing the burden on your liver and, where possible, treating the specific condition causing the damage. For viral hepatitis, that means antiviral therapy. For alcohol-related liver disease, it means stopping alcohol intake. For drug-induced injury, it means identifying and removing the offending medication.

Beyond treating the specific disease, general liver-supportive habits matter. Maintaining a healthy weight is one of the most impactful things you can do. Excess body fat, particularly visceral fat, drives nonalcoholic fatty liver disease, which is now the most common form of chronic liver disease globally. Bilirubin metabolism is sensitive to body composition: research has shown that bilirubin levels normalize in response to weight loss, and that exercise raises plasma bilirubin in ways that may have protective antioxidant effects.⁷ These shifts in bilirubin handling can, over time, change how much urobilinogen your body produces and excretes.

It is worth noting an apparent paradox: fasting and caloric restriction actually increase circulating bilirubin levels, partly because slower gastric emptying reduces bilirubin excretion into the gut and partly because fasting may ramp up the enzyme that generates bilirubin in the first place.⁷ So crash dieting is not the answer. Steady, sustainable weight management paired with moderate exercise is a better approach for anyone with a liver-related elevation.

Fixing Constipation to Reduce Reabsorption

Of the three main causes, constipation is the one most directly within your control. The longer digested material sits in your colon, the more urobilinogen gets reabsorbed into circulation and eventually filtered into your urine. Improving bowel regularity can make a meaningful difference.

Standard recommendations apply here: adequate fiber from fruits, vegetables, and whole grains; sufficient daily fluid intake; and regular physical activity, which stimulates intestinal motility. If those measures are not enough, your doctor may suggest an osmotic laxative or a stool softener. The key point is that this is one of the few scenarios where urobilinogen levels can drop without any treatment aimed at the liver or blood. Restoring normal transit time gives the gut less opportunity to send urobilinogen back into the bloodstream.

Urine pH Changes the Reading Too

Here is something that gets almost no attention in standard health information: the acidity of your urine directly affects how much urobilinogen shows up in it, even when the amount being filtered by the kidneys stays the same. Research on urobilinogen excretion showed that raising urinary pH from acidic (around 5) to alkaline (around 8) increased urobilinogen excretion from about 30 percent of the filtered amount to as high as 200 percent, because the kidneys were actively secreting it at higher pH rather than just filtering it passively.⁸

In practical terms, this means that if you tested your urine right after eating a large meal heavy in vegetables or taking sodium bicarbonate (both of which make urine more alkaline), the urobilinogen reading could appear higher than if you had tested in the morning on an empty stomach with more acidic urine. This does not mean you should try to acidify your urine to game the test. But it does mean that a single elevated reading, especially one taken at an unusual time of day or after dietary changes, may not reflect a real clinical problem. If you are tracking urobilinogen over time, testing first thing in the morning provides the most consistent baseline.

Your Gut Bacteria Are Running the Show

Urobilinogen does not appear out of nowhere in the gut. It is manufactured by specific intestinal bacteria, and recent research has identified the exact enzyme responsible. In 2023, researchers pinpointed a gut microbial enzyme called BilR (bilirubin reductase) that converts bilirubin into urobilinogen.⁹ The enzyme comes in two variants, and both were confirmed to reduce bilirubin to urobilinogen in laboratory assays.¹⁰

This matters because the gene encoding BilR is carried predominantly by Firmicutes species, a major group of gut bacteria that includes common inhabitants like Faecalibacterium prausnitzii and species of Roseburia.⁹ Analysis of human gut metagenomes found that BilR is nearly universal in healthy adults, but its prevalence drops in newborns and in people with inflammatory bowel disease.⁹ This suggests that the composition of your gut microbiome directly influences how much urobilinogen gets produced in the first place.

Nobody is yet prescribing specific probiotics to dial urobilinogen up or down. But the discovery opens an interesting avenue. If your microbiome is unusually rich in bilirubin-reducing species, you may naturally produce more urobilinogen. Conditions that shift the microbiome, such as antibiotic courses, chronic inflammation, or major dietary changes, could theoretically alter urobilinogen output. This is still early science, though, and the practical applications have not caught up to the discovery yet.

Why Newborns and Infants Are Different

If you are a parent who noticed urobilinogen results on your infant’s labs, the context is different from an adult. Newborns produce very little urobilinogen in the first weeks of life because their intestinal microbiome has not yet been colonized by the bacteria that convert bilirubin. Research dating back decades documented that urobilin is only rarely found in feces during the first two weeks, and even as diet diversifies, the total amount excreted remains small compared to adult levels.¹¹ This is consistent with the more recent finding that BilR gene prevalence is low in neonatal gut metagenomes.⁹

This has a practical implication: elevated urobilinogen in a very young infant is unusual and warrants investigation, because the normal microbial machinery to produce it in large quantities is not yet in place. Conversely, very low or absent urobilinogen in a newborn is expected and not a cause for concern.

When Low Urobilinogen Is the Problem

Most people searching this topic are worried about a high reading, but it is worth knowing that an absent or very low urobilinogen in an adult can also be abnormal. If bile is not reaching the intestine at all, perhaps because of an obstructed bile duct from a gallstone or a tumor, then no bilirubin is delivered to the gut bacteria for conversion, and urobilinogen drops to undetectable levels. The urine may instead show elevated direct bilirubin, which has a different clinical significance. Pale or clay-colored stools are a related sign, since stercobilin (the final product of urobilinogen) is what makes stool brown. So a complete absence of urobilinogen combined with pale stool and dark urine is a red flag for biliary obstruction, not something to celebrate as a “low” reading.

Putting It Together Practically

There is no single supplement, food, or trick that lowers urobilinogen in isolation. The path forward depends on what is driving the elevation:

Constipation: Increase fiber, stay well hydrated, and move more. This is the most actionable cause and the one where self-management can genuinely bring numbers down.
Liver stress: Work with a doctor to identify and treat the underlying liver condition. Maintain a healthy weight, avoid alcohol if liver disease is present, and review medications for hepatotoxic agents.
Hemolysis: This requires medical diagnosis and treatment. Nothing you do at home will slow red blood cell destruction if the cause is autoimmune, genetic, or infectious.
False positive: Check whether your medications could interfere with the test. Ask whether a confirmatory test that distinguishes urobilinogen from porphobilinogen is warranted.

If your only abnormal finding is a mildly elevated urobilinogen on a routine dipstick, with normal liver enzymes, normal blood counts, and no symptoms, the reading may simply reflect dehydration concentrating the sample, a pH shift from a recent meal, or a borderline result within the noise of the test. A single dipstick result is a screening tool, not a diagnosis. A repeat test under controlled conditions, ideally first morning urine, can clarify whether the elevation is persistent or a one-off blip.

1
PubMed Central. Bilirubin in the Liver-Gut Signaling Axis
2
PubMed Central. Diagnosis of the hemolytic anemias
3
PubMed. Accuracy of urine urobilinogen and bilirubin assays in predicting liver function test abnormalities
4
PubMed Central. A Rare Presentation of a Child with Dark-Brown Colored Urine Due to Constipation Leading to Reabsorption of Bilirubin and Urobilinogen; A Case Report
5
PubMed Central. A high urinary urobilinogen/serum total bilirubin ratio indicates acute hepatic porphyria in patients with abdominal pain
6
PubMed. Efficacy and safety of pyruvate kinase activator in treating hemolytic anemias: a systematic review
7
Gastroenterology Report. Microbiome-derived cancer: the catabolism of bilirubin to urobilinogen in the liver–gut axis and its consequences
8
PubMed. Renal excretion of urobilinogen in the dog
9
PubMed Central. BilR is a gut microbial enzyme that reduces bilirubin to urobilinogen
10
PubMed Central. Discovery of the gut microbial enzyme responsible for bilirubin reduction to urobilinogen
11
Acta Paediatrica. The Metabolism of Bile Pigments in Infants, with Special Regard to Icterus Neonatorum