Please be patient! It may take up to ONE minute to load all the Engines.
Problems? Please contact our support.
Acid loading test (pH)
DefinitionThis is a test to measure the ability of the renal (kidney) tubules to acidify urine in the presence of increased plasma acidity. See also urine pH .
How the test is performed
There are several ways to perform this test. A typical procedure is described below, but make sure that you follow the specific instructions that you are given. A urine sample and a blood sample are needed to perform this test. The laboratory analyzes the samples for acid.
Urine sample collection:
Check your baby frequently and remove the bag after the infant has urinated into it. For active infants, this procedure may take a couple of attempts -- lively infants can displace the bag, causing an inability to obtain the specimen. The urine is drained into a container for transport back to the health care provider.
A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the band is removed to restore circulation. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
How to prepare for the testTake ammonium chloride capsules orally for 3 days prior to the test. Then a sample of urine and blood are taken (see above). The blood sample is necessary to prove that the ammonium chloride had the desired effect of making the blood slightly acidic.
How the test will feelWhen 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 performedThe test checks the ability of the kidneys to regulate acid-base status.
Normal ValuesStrongly acidic urine of less than pH 6 is normal. The urine should be strongly acidic, if renal tubular acidosis is not present.
What abnormal results meanThe most common disorder associated with abnormal results is renal tubular acidosis.
What the risks areThere are no risks in providing the urine sample.
The risks of having blood drawn include:
Special considerationsVeins 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: 2/9/2004Frank A. Greco, M.D., Ph.D., Director, Biophysical Laboratory, The Lahey Clinic, Burlington, MA. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT