Urine Tests

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Doctors order urine tests for kids to make sure that the kidneys and certain other organs are working as they should, or when they think that a child might have an infection in the kidneys, bladder, or other parts of the urinary tract.

The kidneys make urine (pee) as they filter wastes from the bloodstream, while leaving substances in the blood that the body needs, like protein and glucose. So when urine contains glucose, too much protein, or has other irregularities, it's usually a sign of a health problem.

Urinalysis

A urinalysis is usually ordered when a doctor suspects that a child has a urinary tract infection (UTI) or a health problem that can cause an abnormality in the urine. This test can measure:

  • the number and variety of red and white blood cells
  • the presence of bacteria or other organisms
  • the presence of substances, such as glucose, that usually shouldn't be found in the urine
  • the pH, which shows how acidic or basic the urine is
  • the concentration of the urine

Sometimes, when the urine contains white blood cells or protein, or the test results seem abnormal for another reason, it's because of how or when the urine was collected. For example, a dehydrated child may have concentrated (darker) urine or a small amount of protein in the urine. But that might not mean that there's a health problem. Once the child is rehydrated, these "abnormal" results may disappear. Depending on the amount of protein or other cells in the urine, the doctor may repeat the urine test at another time, just to make sure that everything is back to normal.

How a Urinalysis Is Done

In most cases, urine is collected in a clean container, then a small plastic strip that has patches of chemicals on it (the dipstick) is placed in the urine. The patches change color to indicate things like the presence of white blood cells or glucose.

Next, the doctor or laboratory technologist also usually examines the same urine sample under a microscope to check for other substances that indicate different conditions.

If the dipstick test or the microscopic test shows white blood cells, red blood cells, or bacteria (possible signs of a kidney or bladder infection), the doctor may send the urine to a lab for a urine culture to identify bacteria that may be causing the infection.

Getting a urine sample. It can be difficult to get urine samples from kids to test for a possible infection. That's because the skin around the urinary opening (urethra) normally is home to some of the same bacteria that cause UTIs. If these bacteria contaminate the urine, the doctors might not be able to use the sample to tell if there is a true infection or not.

To avoid this, the skin surrounding the urinary opening has to be cleaned and rinsed immediately before the urine is collected. In this "clean-catch" method, the patient (or parent) cleans the skin, the child then urinates, stops momentarily (if the child is old enough to cooperate), then urinates again into the collection container. Catching the urine in "midstream" is the goal.

In some cases (for instance, if a child is not toilet trained), the doctor or nurse will insert a catheter (a narrow, soft tube) through the urinary tract opening into the bladder to get the urine sample.

If you have any questions about urine tests, talk with your doctor.

Reviewed by: Yamini Durani, MD
Date reviewed: March 2012



Related Resources

OrganizationNational Kidney Foundation (NKF) NKF seeks to prevent kidney and urinary tract diseases, improve the health and well-being of individuals and families affected by these diseases, and increase the availability of all organs for transplantation.
OrganizationAmerican Academy of Pediatrics (AAP) The AAP is committed to the health and well-being of infants, adolescents, and young adults. The website offers news articles and tips on health for families.
Web SiteLab Tests Online This non-commercial site was developed by laboratory professionals to educate caregivers, patients, and patients' families about lab tests.


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A to Z: Cystitis Learn about cystitis (inflammation of the bladder, commonly called a bladder infection). It is the most common type of urinary tract infection (UTI).
Urine Test: Routine Culture A urine culture is used to diagnose a urinary tract infection (UTI) and determine what kinds of germs are causing it.
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Urine Test: Automated Dipstick Urinalysis Automated dipstick urinalysis results may point to a urinary tract infection (UTI) or injury, kidney disease, or diabetes.
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Urine Test: Microscopic Urinalysis A microscopic urinalysis can help detect a urinary tract infection (UTI), kidney problems, diabetes, or a urinary tract injury.
Urine Test: Creatinine Low levels of creatinine in the urine may point to a kidney disease, certain muscular and neuromuscular disorders, or an obstruction of the urinary tract.
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Kidneys and Urinary Tract The bean-shaped kidneys, each about the size of a child's fist, perform several functions essential to health. Their most important role is to filter blood and produce urine.
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Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

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