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Acid loading test (pH)

Contents of this page:

Illustrations

Female urinary tract
Female urinary tract
Male urinary tract
Male urinary tract

Definition    Return to top

The acid loading test (pH) measures the ability of the kidney tubules to acidify urine when there is increased plasma acidity.

See also: Urine pH

How the Test is Performed    Return to top

You'll be told to take ammonium chloride capsules by mouth for 3 days. Then, a urine and blood sample are taken. (The blood sample is needed to show that the ammonium chloride made the blood slightly acidic.) The laboratory measures the level of acid found in both samples.

For information on how the urine and blood samples are obtained, see:

How to Prepare for the Test    Return to top

Your doctor will tell you to take ammonium chloride capsules by mouth for 3 days prior to the test.

How the Test Will Feel    Return to top

When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

Why the Test is Performed    Return to top

This test is done to see how well your kidneys control the body's acid-base status.

Normal Results    Return to top

Strongly acidic urine of less than pH 6 is normal.

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean    Return to top

The most common disorder associated with an abnormal result is renal tubular acidosis.

Risks    Return to top

There are no risks associated with providing a urine sample.

The risks of having blood drawn include:

Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

Update Date: 10/15/2007

Updated by: Frank A. Greco, M.D., Ph.D., Director, Biophysical Laboratory, The Lahey Clinic, Burlington, MA. Review provided by VeriMed Healthcare Network.

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