Allergy Assay

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Definition

The factor II assay is a test to measure the activity of factor II -- one of the substances involved in blood clotting (coagulation).


Alternative Names

Prothrombin


How the test is performed

Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The area is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.

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