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May 22, 2013
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Blood in the Urine (cont.)

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Diagnosis of Blood in the Urine: Lab Tests

Regardless of whether you have microscopic or gross hematuria, your health-care provider will ask questions to try to discover the cause.

  • You will be asked about your medical condition and history, particularly whether you have ever had blood in the urine before.
  • You will be asked about what medications you take or have taken in the past, including over-the-counter drugs, illegal drugs or drugs of abuse, herbs, supplements, and other alternative products.
  • You will be asked whether you have had any recent illnesses, accidents, surgeries, or medical procedures or tests.
  • You may be asked whether you have traveled outside the United States.
  • You will be asked about your work history and about exposures to toxic chemicals.
  • You will be asked about your lifestyle and habits, including smoking, diet, and exercise.
  • You will be asked about your urinary habits and recent changes in your urinary habits.
  • Questions about your sexual activity and practices might be asked.

Laboratory tests: After the initial examination, laboratory and imaging studies may be performed.

  • Urine "dipstick": This will probably be the first test performed in the emergency department or medical office. A strip of chemically treated paper is dipped into a cup containing a sample of your urine. The paper will show different colors to indicate the presence of blood, protein, glucose, or infection. Under certain conditions the dipstick can give a false-positive result for blood.
  • Urine analysis (urinalysis): A formal urinalysis usually follows the dipstick test. Urinalysis is more accurate and gives a better idea of what is causing the bleeding. This is usually not done in the doctor's office but at a laboratory where the doctor sends the urine. The presence of protein in the urine, for example, signifies that a kidney problem is causing the hematuria. The urine is examined under a microscope to look for red blood cells and white blood cells (which signify infection) as well as other cells and materials that may be present in the urine.
  • Urine culture: A small amount of the urine is brushed on a special dish and placed in an incubator. Unusual bacterial growth indicates a urinary tract infection.

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Blood In Urine - Causes

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Read What Your Physician is Reading on Medscape

Hematuria »

Hematuria is one of the most common urinary findings that result in children presenting to pediatric nephrologists.

Read More on Medscape Reference »


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