You will be told to take ammonium chloride capsules by mouth for 3 days. Then, a urine and blood sample are taken. The laboratory measures the level of acid found in both samples.
For information on how the urine and blood samples are obtained, see:
Your doctor will tell you to take ammonium chloride capsules by mouth for 3 days prior to the test.
How the test will feel
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
This test is done to see how well your kidneys control the body's acid-base status.
Normal Values
Urine with a pH less than 5.3 is normal.
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.
There are no risks associated with providing a urine sample.
The risks of having blood drawn include:
Excessive bleeding
Fainting or feeling lightheaded
Hematoma (blood accumulating under the skin)
Infection (a slight risk any time the skin is broken)
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.
Review Date:
12/19/2011
Reviewed By:
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Herbert Y. Lin, MD, PHD, Nephrologist, Massachusetts General Hospital; Associate Professor of Medicine, Harvard Medical School. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
