Antithrombin III Antigen (Immunologic)
Confirmation and characterization of congenital AT deficiency
Blue-top (sodium citrate) tube
Do not draw from an arm with a heparin lock or heparinized catheter.
Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.1 Evacuated collection tubes must be filled to completion to ensure a proper blood-to-anticoagulant ratio
Room temperature: Unacceptable
Frozen: 30 days
Severe hemolysis; improper labeling; clotted specimen; specimen diluted with IV fluids; samples thawed in transit; improper sample type; sample out of stability