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Alternative namesPhosphorus - serum; PO4; Inorganic phosphate; HPO4-2
DefinitionThe serum phosphorus test measures the amount of phosphate in the blood.
How the test is performed
Adult or child:
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 testThe health care provider may advise you to withhold drugs that may affect the test (see "special considerations").
Infants and children:
The preparation you can provide for this test depends on your child's age, previous experiences, and level of trust. For general information regarding how you can prepare your child, see the following topics:
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 performed
This test is performed to evaluate the blood level of phosphorus, particularly in the presence of disorders known to cause abnormal phosphorus levels.
Normal ValuesNormal values range from 2.4 to 4.1 mg/dl. Normal value ranges may vary slightly among different laboratories.
Note: mg/dl = milligrams per deciliter
What abnormal results mean
Abnormal results are indicated by the following:
Greater-than-normal levels may occur with:
What the risks are
Special considerationsAntacids can bind PO4 and decrease absorption.
Nonpharmacological factors that can affect PO4 measurements include: enemas containing sodium phosphate, excess vitamin D supplements, and intravenous glucose administration (because PO4 enters cells along with glucose).
Drugs that can increase PO4 measurements include: laxatives containing Na2HPO4 (sodium phosphate), methicillin, and excess vitamin D or 1,25-dihydroxy vitamin D.
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: 2/11/2004Irfan A. Agha, M.D., Department of Medicine, Renal Division, St. Louis University, St. Louis, MO. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT