Allina Health Laboratory a part of Abbott Northwestern Hospital



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Test Name:Anti thrombin lll activity
Test Number:621
Collect:4.5 mL (3.2%) Na Citrate tube - lt blue
Minimum Volume:2.7 mL (3.2%) Na Citrate tube - lt blue
Container:2 – Microcentrifuge tubes (Beaker sites) or
2 – Coagulation Specimen Transport Tubes
Processing:Prepare Platelet Poor Plasma following the instructions included in the Collection/Processing Details, and freeze.
Transport/Stability:Frozen - strict
Refrigerated - NO
Alternate Names:AT3
Performing Lab:AHL - Coagulation/Special Coagulation; V
Days Set Up:Varies; 1 - 2 times/wk
Available STAT
Expected TAT:3 - 5 days
Ref. Ranges:
agerange in %
0-5 days40-95
6-30 days48-108
1mo–6 mo70-125
Processing Details:
Do not over or under fill tube, as the ratio of anticoagulant to whole blood is critical (see Additional Info link).
Greiner tubes are not acceptable.

Process Platelet Poor Plasma (P.P.P) following the linked instructions.
Basic Coagulation Specimen Processing Instructions
Separate plasma into two (2) 1 mL aliquots, label as "NaCi Plasma P.P.P" and freeze immediately.
Specimens will be rejected if hemolyzed, or patient on heparin > 1.0 IU/mL.
CPT Codes:85300
Additional Information: Proper Na Citrate Tube Filling
Date Created:11/30/2001
Revised Date:08/23/2018