Antithrombin (AT) III Antigen *

SIM

CPT

Synonyms

Specimen Type

Container

Blue top- Sodium Citrate tube

Collection Instructions

Collect in blue top tube containing 3.2 % buffered sodium citrate.  Fill to completion to ensure proper blood to anticoagulant ratio.  Mix sample by gentle inversion

Volume

Volume: 2 ml. 
Min. volume: 1 ml.

Additional Information

Confirmation and characterization of congenital AT deficiency

Patient Preparation

Do not draw from an arm with a heparin lock or heparinized  catheter.  Patient should not be on heparin therapy because heparin decreases plasma AT levels.

Specimen Processing Instructions

Separate plasma from cells and freeze ASAP

Transport Requirements

Frozen

Specimen Stability

Rejection Criteria

Severe hemolysis; improperly filled tubes; thawed specimen; 
serum or specimen collected with anticoagulant other than sodium citrate

Reference Range

39% to 89% newborns levels are lower; levels reach adult ranges by 6 months.

Critical Value

Test Includes

Methodology

Testing Frequency

LCA

Reviewed By

Reviewed Date

Supplemental

* Denotes Reference Lab Test