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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.
Urine appearance and color; Routine urine test
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.
The sample is sent to a lab, where it is examined for the following:
Physical color and appearance:
The urine specific gravity test reveals how concentrated or dilute the urine is.
Chemical appearance (urine chemistry):
Certain medicines change the color of urine, but this is not a sign of disease. Your health care provider may tell you to stop taking any medicines that can affect test results.
Medicines that can change your urine color include:
The test involves only normal urination, and there is no discomfort.
A urinalysis may be done:
Additional conditions under which the test may be performed:
Normal urine may vary in color from almost colorless to dark yellow. Some foods (like beets and blackberries) may turn the urine a red color.
Usually, glucose, ketones, protein, and bilirubin are not detectable in urine. The following are not normally found in urine:
Normal value ranges may vary slightly among different laboratories. Talk to your health care provider about the meaning of your specific test results.
Abnormal results may mean you have an illness. Your health care provider will discuss the results with you.
There are no risks.
If a home test is used, the person reading the results must be able to tell the difference between different colors, since the results are interpreted using a color chart.
McPherson RA, Ben-Ezra J. Basic examination of urine. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 28.