Urinalysis is the physical, chemical, and microscopic examination of urine. It involves a number of tests to detect and measure various compounds that pass through the urine.
How the Test is Performed
A urine sample is needed. Your health care provider will tell you what type of urine sample is needed. Two common methods of collecting urine are 24-hour urine collection and clean catch urine specimen.
24-hour urine collection
The urine 24-hour volume test measures the amount of urine produced in a day. The amounts of creatinine, protein, and other chemicals released into ...Read Article Now Book Mark Article
Clean catch urine specimen
A clean catch is a method of collecting a urine sample to be tested. The clean-catch urine method is used to prevent germs from the penis or vagina ...Read Article Now Book Mark Article
The sample is sent to a lab, where it is examined for the following:
PHYSICAL COLOR AND APPEARANCE
How the urine sample looks to the naked eye:
- Is it clear or cloudy?
- Is it pale, or dark yellow, or another color?
The urine sample is examined under a microscope to:
- Check if there are any cells, urine crystals, urinary casts, mucus, and other substances.
- Identify any bacteria or other germs.
CHEMICAL APPEARANCE (urine chemistry)
Urine chemistry is a group of one or more tests done to check the chemical content of a urine sample.Read Article Now Book Mark Article
- A special strip (dipstick) is used to test for substances in the urine sample. The strip has pads of chemicals that change color when they come in contact with substances of interest.
Examples of specific urinalysis tests that may be done to check for problems include:
How to Prepare for the Test
Certain medicines change the color of urine, but this is not a sign of disease. Your provider may tell you to stop taking any medicines that can affect test results.
Medicines that can change your urine color include:
- Iron supplements
How the Test will Feel
The test involves only normal urination, and there is no discomfort.
Why the Test is Performed
A urinalysis may be done:
Normal urine varies in color from almost colorless to dark yellow. Some foods, such as beets and blackberries, may turn urine red.
Usually, glucose, ketones, protein, and bilirubin are not detectable in urine. The following are not normally found in urine:
- Red blood cells
- White blood cells
Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.
What Abnormal Results Mean
Abnormal results may mean you have an illness, such as:
- Urinary tract infection
- Kidney stones
- Poorly controlled diabetes
- Bladder or kidney cancer
Bladder cancer is a cancer that starts in the bladder. The bladder is the body part that holds and releases urine. It is in the center of the lower...Read Article Now Book Mark Article
Your provider can discuss the results with you.
There are no risks with this test.
If a home test is used, the person reading the results must be able to tell the difference between colors, because the results are interpreted using a color chart.
Linda J. Vorvick, MD, Clinical Associate Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Chernecky CC, Berger BJ. Urinalysis (UA) - urine. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. St Louis, MO: Elsevier Saunders; 2013:1146-1148.
Riley RS, McPherson RA. Basic examination of urine. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 29.
Sobel JD, Brown P. Urinary tract infections. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 72.