A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

Functional Antithrombin III

Test Code
LAB311


Alias/See Also
1231500009


CPT Codes
85300

Includes
FUNCTIONAL ANTITHROMBIN III


Preferred Specimen
Blue Top (Sodium Citrate) tube


Minimum Volume
Fully collected Blue Top tube


Instructions
Fully collect a Blue Top (sodium citrate) tube. Mix sample immediately by gentle inversion at least six times.


Transport Temperature

Send platelet poor plasma Frozen to -20C or less. 



To obtain platelet poor plasma: Centrifuge, separate plasma, re-centrifuge, and separate plasma into a transport tube.




Specimen Stability
Refrigerated: 4 hours Frozen: > 4 hours


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Underfilled tubes


Methodology
ACL TOP 750

Reference Range
Males/Females:
83.0-128.0%


Performing Laboratory
LITTLE ROCK LABORATORY


Last Updated: August 26, 2026


The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.