The person will be monitored during this time to make sure the bleeding stops. When the needle is inserted, most people feel moderate discomfort or pain. Afterward, there may be some throbbing . The arterial stick is more painful than venipuncture because arteries are deeper than veins, have thicker walls, and have more nerves. It is also used for regulation of body temperature, regulation of fluids, and acid-base equilibrium.
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 is used for 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. The information provided herein should not be used for diagnosis or treatment of any medical condition.