Urine Color: What Is Considered Normal and What Dark Urine Means

Urine is a filtrate of blood, and its color changes every day. Most often the cause is harmless: water, food, vitamins. The color depends on food, medications, and the body's condition, and sometimes indicates disease.

What determines urine color and what is normal

Normally, urine is clear, light yellow, straw-colored. The yellow pigment is urochrome. The intensity depends on fluid intake: when there is a lot of urine, it is lighter; when there is little, it is more concentrated and darker. Daily diuresis in adults is 1200–1600 cm³, density 1005–1030 g/L, pH 4.8–7.5, water content 91–96%. Color is changed by food and medications: beets and blackberries give a pink color, dyes can give almost any color, B vitamins and carotene give bright yellow or orange. Therefore, the doctor asks what you eat and what medications you take. If the unusual color persists longer, see a doctor. Blood in the urine even once is also a reason for a visit.

Dark urine in men and women: possible causes

In men and women, the causes are mostly the same: dehydration, food, medications, infection, bleeding. Dark yellow and orange urine can be caused by B vitamins, carotene, phenazopyridine, rifampin, and warfarin, after taking laxatives. Dark brown but clear urine is a sign of severe dehydration, muscle breakdown (rhabdomyolysis), or liver disease: acute viral hepatitis, cirrhosis, when bilirubin is excreted in the urine. Pink, red, and light brown urine can indicate blood, hemolytic anemia, kidney or urinary tract injury, porphyria, bladder or kidney tumor, or vaginal bleeding. In women, pink urine is easily mistaken for menstruation or intermenstrual bleeding. In men over 50, difficulty starting urination, frequent and sudden urges, and nighttime trips to the toilet along with a change in color indicate an enlarged prostate.

Urine color in kidney diseases

Gray-pink color indicates blood in the urine from the upper urinary tract. Pink, red, or brown urine can occur with blood in the urine. Kidney stones cause blood in the urine along with attacks of severe pain in the side, lower back, or groin: the pain comes and goes, the person cannot lie still, and nausea appears. Kidney injury also colors the urine red. Black urine can occur with myoglobinuria.

Urine color in cystitis

With a urinary tract infection, urine is cloudy, milky white, with a bad odor. Cloudiness is caused by bacteria, crystals, fat, leukocytes, erythrocytes, and mucus. Along with this, there is burning during urination, frequent urges, sometimes high fever and pain in the side or lower back. Blood can also occur with infection: urine may be pink. Milky white color is chyluria, pus in the urine is pyuria, fat is lipuria. Green and blue tints are caused by urinary tract infections, bilirubin, food dyes, and medications, including methylene blue.

How urine color is assessed in a urine test

Normal is clear light yellow urine. Chemical and microscopic urine analysis has diagnostic value: deviations from normal composition indicate disorders in the body. Then the doctor chooses based on the picture: urine culture for infection, urine cytology, blood tests with liver function tests, ultrasound of the kidneys and bladder or CT, cystoscopy. First an examination, if necessary rectal or vaginal. The doctor will ask when you first noticed a different color and whether it changes during the day, what you eat and what medications you take, whether you have had kidney or urinary tract diseases, whether there is pain, fever, thirst, whether you smoke, whether you work with dyes, whether there is a family history of kidney or bladder cancer. Shame is unnecessary here: the urine color on the form is not a diagnosis.

When a change in urine color requires seeing a doctor

See a doctor in the following cases:

• the color is unusual, cannot be explained, and does not return to normal;
• blood in the urine is visible at least once;
• urine is clear but dark brown;
• urine is pink, red, or smoky brown, and you have not changed food or medications;
• there is burning, frequent urges, fever, pain in the side or lower back.

Blood in the urine must be checked, even if it is small: it can be a sign of cancer, and an early finding is easier to treat.

A change in urine color alone is not a reason to call an ambulance; 103/112 — if the condition is life-threatening (for example, severe injury, signs of stroke or heart attack).

This material is for reference: it explains what can happen but does not replace a doctor's consultation.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer