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Labcorp Oklahoma, Inc.
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Anti-Thrombin 3 (ATIII), Functional Activity

Order Name THROM3 FUN
Test Number: 1501825
Revision Date 10/08/2024
Test Name Methodology LOINC Code
Anti-Thrombin 3 (ATIII), Functional Activity
Chromogenic 27811-9 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2.7 mL Whole Blood Sodium Citrate 3.2% (Blue Top) Room Temperature
Alternate 1 1.5 mL Double Spun Plasma Sterile, Capped Plastic Tube Frozen
Instructions Please indicate anticoagulant therapy. 
Each 2.7mL Sodium Citrate 3.2% (Blue Top) tube must be filled to the proper level, no hemolysis. Improperly filled tubes can give erroneous results. Whole blood must be transported to lab immediately.
If testing cannot be started within 4 hours of collection the specimen must be double spun then 1.5 mL plasma aliquot from each tube into individual plastic aliquot tubes and freeze.
Do not pool aliquots together!
GENERAL INFORMATION
Testing Schedule Tue  
Expected TAT 1-7 Days  
Clinical Use Antithrombin III is used to assess thrombotic risk. 
CPT Code(s) 85300
Lab Section Coagulation