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ANTITHROMBIN III LEVEL
MessageCollect a full tube to the fill line, following standard venipuncture techniques. Do not over or under fill tubes as the ratio of blood to anticoagulant (9: 1) is necessary for accurate results. Gently Invert the tube three or four times immediately after venipuncture to ensure proper mixing of blood and anticoagulant.
Test Code
LAB311 ATIII
Alias/See Also
ATIII
CPT Codes
85300
Instructions
Processing Instructions (Lab use only): Within 4 hours of collection, centrifuge, transfer all plasma into a plastic vial, and centrifuge plasma again. Aliquot plasma into separate plastic vial leaving 0.25 mL in the bottom of centrifuged vial. Freeze plasma immediately (no longer than 4 hours after collection) at -20° C, or, ideally at <=-40° C. Minimum Testing Volume: 1 mL Transport Temperature: Frozen Stability: Ambient: 4 hoursRefrigerated : UnacceptableFrozen: 1 month (plasma only) Causes for Rejection: Specimens submitted Refrigerated or greater than 4 hours after collection at room temperature, are short draws, clotted or have excessive hemolysis, icterus or lipemia.
Report Available
STAT 2-Hours|Routine 8-Hours|Timed 8-Hours
Clinical Significance
1230140002
Last Updated: May 18, 2026