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Alternative names Return to top
Blood sample - arterialDefinition Return to top
An arterial stick is collection of blood from an artery for laboratory testing.How the test is performed Return to top
Usually the blood is drawn from the wrist. However, it may also be drawn from the inside of the elbow, groin, or other artery. A heartbeat (pulse) is felt by pressing on the area above an artery.
The area is cleaned with antiseptic and a needle inserted. A small amount of anesthetic may be injected or applied before the needle is inserted. The blood will easily flow into the specially prepared (heparinized) syringe.
The needle is removed after there is a sufficient sample of blood. Pressure is applied to the puncture site for 5 to 10 minutes to stop the bleeding. The person will be monitored during this time to make sure the bleeding stops.
How to prepare for the test Return to top
Preparation varies with the specific test performed.How the test will feel Return to top
Puncture of the artery may be somewhat more uncomfortable than puncture of a vein, and requires firm pressure over the site after it is drawn.Why the test is performed Return to top
Blood transports oxygen, food, waste products, and other materials within the body. It is also regulates body temperature, fluids, and acid-base equilibrium.
Blood is made up of a fluid portion (plasma) and a cellular portion. Plasma contains various substances dissolved in the fluid. The cellular portion consists primarily of red blood cells, but also includes white blood cells and platelets.
Because blood serves multiple functions within the body, tests on the blood or its components may give valuable clues in the diagnosis of a multitude of medical conditions.
Arterial blood differs from venous blood primarily in its content of dissolved gases. Testing of arterial blood shows the make-up of the blood before any of its contents are used by the body tissues.
Normal Values Return to top
See specific tests, particularly the arterial blood gas test.What abnormal results mean Return to top
An arterial stick is performed to obtain arterial blood samples. Arterial blood samples are primarily performed to measure arterial blood gases (which may indicate breathing problems or metabolic disorders). However, arterial sticks may occasionally be performed to obtain blood culture or serum chemistry samples.What the risks are Return to top
Special considerations Return to top
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. If blood is easier to obtain from a particular location or side, it is helpful to let the person drawing the blood know before starting the test. Update Date: 8/18/2003 Updated by: David Webner, M.D., Sports Medicine Fellow, Crozer-Keystone Family Practice Program, Springfield, PA. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |