Urine pH

Alternative Names: pH - urine

A urine pH test measures the acidity of urine.

See also: Acid loading test

Why is the Test Performed?

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.

How is the Test Performed?

A urine sample is needed. For information on collecting a urine sample, see: Clean-catch urine sample

Preparation for the Test

Your health care provider may tell you to stop taking certain drugs that can affect the results of the test.

• Drugs that increase urine pH include acetazolamide, potassium citrate, and sodium bicarbonate.
• Drugs that can decrease urine pH include ammonium chloride, thiazide diuretics, and methenamine mandelate.

Eat a normal, balanced diet for several days before the test.

• A diet high in citrus fruits, vegetables, or dairy products can increase your urine pH.
• A diet high in meat products or cranberries can decrease your urine pH.

How will the Test Feel?

The test involves only normal urination, and there is no discomfort.

Considerations

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.

Normal Results for Urine pH

The normal values range from 4.6 to 8.0.

The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

A high urine pH may be due to:

• Gastric suction
• Kidney failure
• Kidney tubular acidosis
• Urinary tract infection
• Vomiting

A low urine pH may be due to:

• Diabetic ketoacidosis
• Diarrhea
• Starvation

The test also may be done under the following conditions:

• Acidosis
• Alkalosis
• Interstitial nephritis
• Sepsis

Female urinary tract	Male urinary tract	PH urine test

Review Date: 8/21/2011
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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