Blood In Urine

What is Hematuria?

Hematuria is blood in the urine. Two types of blood in the urine include blood that can be seen with the naked eye, and blood that cannot be seen in the urine. Blood that can be seen in the urine is called gross hematuria. Blood that cannot be seen in the urine, except when examined with a microscope, is called microscopic hematuria.

What are the symptoms of hematuria blood in urine?

Most people with microscopic hematuria do not have symptoms. People with gross hematuria have urine that is pink, red, or cola-colored due to the presence of red
blood cells (RBCs). Even a small amount of blood in the urine can cause urine to change color. In most cases, people with gross hematuria do not have other symptoms.
However, people with gross hematuria that includes blood clots in the urine may have pain.

What Causes Blood In Urine (Hematuria)?

Hematuria can be caused by menstruation, vigorous exercise, sexual activity, viral illness, trauma, or infection, such as a urinary tract infection (UTI). More serious causes of hematuria include:

  • bladder or kidney cancer
  • inflammation of the kidney, urethra, bladder, or prostate—a walnut-shaped gland in men that surrounds the urethra at the neck of the bladder and supplies fluid that goes into semen
  • polycystic kidney disease—an inherited disorder characterized by many grape-like clusters of fluid-filled cysts that make both kidneys larger over time, taking over and destroying working kidney tissue
  • blood clots
  • blood clotting disorders, such as hemophilia
  • sickle cell disease—an inherited disorder in which RBCs form an abnormal crescent shape, resulting in less oxygen delivered to the body’s tissues, clogging of small blood vessels, and disruption of healthy blood flow

Who is at risk for hematuria?

Almost anyone, including children and teens, can have hematuria. Factors that increase the chance a person will have hematuria include:

  • a family history of kidney disease
  • an enlarged prostate, which typically occurs in men age 50 or older
  • urinary stone disease or kidney stones
  • certain medications including aspirin and other pain relievers, blood thinners, and antibiotics
  • strenuous exercise such as long-distance running
  • a recent bacterial or viral infection

How is Hematuria Blood in Urine Diagnosed?

Hematuria is diagnosed with urinalysis, which is the testing of a urine test sample. The urine sample is collected in a special container in a health care provider’s office or commercial facility and can be lab-tested in the same location or sent to a lab for analysis.

For the test, a nurse or technician places a strip of chemically treated paper, called a dipstick, into the urine. Patches on the dipstick change color when RBCs are present in urine. When blood is visible in the urine or a dipstick test of the urine indicates the presence of RBCs, a health care provider examines the urine with a microscope to make an initial diagnosis of hematuria. The next step is to diagnose the cause of the hematuria.


Further testing of the urine may be done to check for problems that can cause hematuria, such as infection, kidney disease, and bladder cancer. The presence of white blood cells signals a UTI. Red blood cells that are misshapen or clumped together to form little tubes, called casts, may indicate kidney disease. Large amounts of protein in the urine, called proteinuria, may also indicate kidney disease. The urine can also be tested for the presence of cancer cells.

Blood test

A blood test involves drawing blood at a health care provider’s office or commercial facility and sending the sample to a lab for analysis. A blood test can show the presence of high levels of creatinine, a waste product of normal muscle breakdown, which may indicate kidney disease.


A biopsy is a procedure that involves taking a piece of kidney tissue for examination with a microscope. The biopsy is performed by a health care provider in a hospital with light sedation and local anesthetic. The health care provider uses imaging techniques such as ultrasound or a computerized tomography (CT) scan to guide the biopsy needle into the kidney. The kidney tissue is examined in a lab by a pathologist—a doctor who specializes in diagnosing diseases. The test helps diagnose the type of kidney disease-causing hematuria.


Cystoscopy is a procedure that uses a tubelike instrument to look inside the urethra and bladder. Cystoscopy is performed by a health care provider in the office, an outpatient facility, or a hospital with local anesthesia. However, in some cases, sedation and regional or general anesthesia are needed. Cystoscopy may be used to look for cancer cells in the bladder, particularly if cancer cells are found with urinalysis.

Kidney imaging tests

An intravenous pyelogram (IVP) is an x-ray of the urinary tract. A special dye, called contrast medium, is injected into a vein in the person’s arm, travels through the body to the kidneys, and makes urine visible on the x-ray. The contrast medium also shows any blockage in the urinary tract.

When a small mass is found with IVP, another imaging test, such as an ultrasound, CT scan, or magnetic resonance imaging (MRI), can be used to further study the mass. Imaging tests are performed in an outpatient center or hospital by a specially trained technician, and the images are interpreted by a radiologist—a doctor who specializes in medical imaging.

Anesthesia is not needed, though light sedation may be used in some cases. Imaging tests may show a tumor, a kidney or bladder stone, an enlarged prostate, or other blockages of the normal flow of urine.

How is hematuria treated?

Hematuria is treated by treating its underlying cause. If no serious medical condition is causing hematuria, no treatment is needed. Hematuria caused by a UTI is treated with antibiotics; urinalysis should be repeated 6 weeks after antibiotic treatment ends to be sure the infection has resolved.

Eating, Diet, and Nutrition

Eating, diet, and nutrition have not been shown to play a role in causing or preventing hematuria.


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