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Alternative names5-nucleotidase; 5'-NT
DefinitionThis is a blood test that measures the amount of 5-N'Tase.
How the test is performed
Blood is drawn from a vein on the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic, and an elastic band is placed around the upper arm to apply pressure and restrict blood flow through the vein. This causes veins below the band to fill with blood.
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 testYour health care provider will instruct you, if necessary, to discontinue drugs that may interfere with the test. These include drugs that can damage the liver, such as Tylenol (acetaminophen), methyldopa, nitrofurantoin, isoniazid, and halothane.
For infants and children:
The preparation you can provide for this test depends on your child's age and previous experience. For specific 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 performedSerum 5'-N'Tase is measured as an indicator of liver damage resulting primarily from interference with the secretion of bile. Serum 5'-N'Tase is not as sensitive as some other enzymes (for example, ALP , AST , and ALT ) to liver damage, but it is a more liver-specific enzyme . It is used mostly to differentiate elevated enzymes due to liver damage from elevated enzymes due to skeletal muscle damage.
Normal ValuesThe normal value is 2 to 17 U/L.
Note: U/L = units per liter
What abnormal results meanGreater than normal levels of 5'-N'Tase may indicate:
What the risks are
The risks associated with having blood drawn are:
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