Please be patient! It may take up to ONE minute to load all the Engines.
Problems? Please contact our support.
Alternative namespH - urine
DefinitionA urine pH test measures the pH (acidity) of urine. See also acid loading test .
How the test is performedChild or adult:
Collect a "clean-catch" (midstream) urine sample. To obtain a clean-catch sample, men or boys should wipe clean the head of the penis . Women or girls need to wash the area between the lips of the vagina with soapy water and rinse well. As you start to urinate, allow a small amount to fall into the toilet bowl (this clears the urethra of contaminants). Then, in a clean container, catch about 1 to 2 ounces of urine and remove the container from the urine stream. Give the container to the health care provider or assistant.
Thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on your infant. For males, the entire penis can be placed in the bag and the adhesive attached to the skin. For females, the bag is placed over the labia. Place a diaper over the infant (bag and all). 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.
How to prepare for the testThe health care provider may advise you to discontinue drugs that can affect the results of the test.
Eat a normal, balanced diet for several days before the test.
Submit a urine sample to the laboratory. If the specimen is contaminated by vaginal discharge or bleeding , then collect a clean-catch sample. If the collection is being taken from an infant, a couple of extra collection bags may be necessary.
How the test will feelThe test involves only normal urination, and there is no discomfort.
Why the test is performed
Certain medications are more effective in acidic or alkaline environments, for example, streptomycin, neomycin, and kanamycin. These are more effective in treating urinary tract infections when the urine is alkaline.
Only in severe life-threatening disease states does the pH fall below 7.2 or above 7.6. More dramatic variation is incompatible with life. The body maintains the pH within this narrow range by using buffers, that is, a chemical such as a weak acid or base which can exist in 2 forms. These alternative forms are interconvertible through the absorption or release of hydrogen ions.
The most important buffer in the body is the bicarbonate buffer system: H+ + HCO3- <--> CO2 + H2O . HCO3- is controlled by the kidneys, and CO2 is controlled by the lungs. If there is a problem with the kidneys, the lungs will try to compensate and visa versa. However, this balance can be upset, for example, in the presence of excessive organic acids which neutralize HCO3-.
The normal values range from 4.6 to 8.0.
What abnormal results mean
Abnormal values are as follows:
Increased urine pH (alkaline urine) may indicate:
What the risks areThere are no risks.
Special considerationsA diet high in citrus fruits or vegetables, or dairy products can increase urine pH (that is, make it more alkaline).
A diet high in meat products or cranberries can decrease urine pH (that is, make it more acidic).
Drugs that can decrease urine pH include: ammonium chloride, chlorothiazide diuretics, and methenamine mandelate.
Drugs that can increase urine pH include: acetazolamide, potassium citrate, and sodium bicarbonate.
Update Date: 1/20/2002Andrew Koren, M.D., Department of Nephrology, NYU-Mount Sinai Medical Center, New York, NY. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT