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Lab Test Dictionary

Antithrombin Activity (ATIII) (Back-Up Only)


Chromogenic Assay


AT III, AT3, Antithrombin 3, Antithrombin III

Specimen Type


Performing Lab

UCSD Special Coag

Epic ID

Other Reference Test

Lab Test Days

Monday-Friday (0800-1630)

Standard TAT

1-3 Days

Stat TAT

2 Hours

Collection Information

Specimen Required

(one) 1.8 mL or (one) 2.7 mL Blood

Container Type

Light Blue (Sodium Citrate)

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 4 Hours; Refrigerated: 4 Hours; Frozen: 6 Months

Rejection Criteria

Hemolysis; Clotted; Improperly filled; Hematocrit >56

Test Volume Required

1 mL Platelet-Poor Plasma

Minimum Test Volume

0.5 mL Platelet-Poor Plasma

Processing Instructions

Separate Platelet-Poor Plasma within 4 hours of collection and freeze immediately. Complete a UCSD Special Coag requisition and place specimen in the -70 freezer for routine courier pick-up Monday-Friday at 0600 and 1030. If ordered STAT Monday-Friday 0800-1430, call TForce for a "Rush" pick-up. For STAT requests (afterhours, weekends or holidays), call TForce for a "Rush" pick-up to deliver to UCSD Jacobs Medical Center Lab on 9300 Campus Point Drive La Jolla, CA 92037; If you have any questions, contact UCSD Jacobs Medical Center Lab at (858) 657-6595.