pH - urine
A urine pH test measures the acidity of urine.
See also: Acid loading test
A urine sample is needed. For information on collecting a urine sample, see: Clean-catch urine sample
Your health care provider may tell you to stop taking certain drugs that can affect the results of the test.
Eat a normal, balanced diet for several days before the test.
The test involves only normal urination, and there is no discomfort.
This test measures how acidic your urine is. Your doctor may order this test to check for changes in your body's acid levels.
It may be done to see if you are at risk for kidney stones. Acidic urine is associated with xanthine, cystine, uric acid, and calcium oxalate stones. Alkaline urine is associated with calcium carbonate, calcium phosphate, and magnesium phosphate stones.
Your doctor may also order this test if you need to take certain medications. Some medications are more effective in acidic or alkaline environments. For example, streptomycin, neomycin, and kanamycin are more effective in treating urinary tract infections when the urine is alkaline.
The normal values range from 4.6 to 8.0.
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
There are no risks.
Urine pH can be affected by various factors after collection such as leaving the urine standing in an uncovered container. Bacteria usually increase the pH as they break down urea in the urine to ammonia.
Bazari H. Approach to the patient with renal disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 115.
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