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Lab Tests.

Last updated Tuesday, January 04, 2005

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Urine tests

About urine tests

Several different tests may be done on a urine sample to determine its contents.

The tests show whether the urine contains red blood cells, protein, or a variety of other abnormal substances. The detection of these substances may indicate kidney damage in certain rheumatic diseases, such as lupus. Some medications, such as gold and penicillamine, can cause protein to be lost through the urine.

24-hour urine test

This test evaluates all the urine collected over a 24-hour period. Sometimes the creatinine passed in a 24-hour urine specimen is measured to provide a clearer picture of kidney function than the creatinine blood test. Uric acid, calcium, and protein tests sometimes must also be done on a 24-hour sample (Note: It is very important to collect every drop--a complete collection is needed).

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