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Test Code LAB2604 Antithrombin III Activity, Plasma

Important Note

 When forwarding specimens to another lab for testing, frozen, double-spun specimens must be sent. 

Additional Codes

Test Name in EPIC EPIC Test Code Mnemonic
ANTITHROMBIN III LAB2604 AT3

 

Methodology

Chromogenic (Functional) Assay

Specimen Requirements


Fill Blue top tube to the etched line located just below the cap of the tube.

Container/Tube: Light-blue top (sodium citrate)

 

Specimen Transport Temperature

 


1.To achieve platelet-poor plasma, spin down, remove top 2/3 of plasma, and spin plasma again in a plastic vial.
2. Aliquot top 3/4 and place platelet-poor plasma in a polypropylene (cloudy plastic) vial.*
3. Glass vials are not acceptable for processing/transport/storage.
4. Preferred specimen volume: 1 mL sodium citrate plasma
5. Minimum specimen volume: 0.5 mL sodium citrate plasma
 
* 2 Aliquot labels will auto print at non-performing sites to double spin 
 
Additional Information: Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.
Ambient 8 hours/Frozen 1 month at -20°C OK

Day(s) Test Set Up

Monday, Thursday

Performing Laboratory

Coagulation-

SMDC Clinical Lab

Fargo Hospital Lab

Test Classification and CPT Coding

85300

Reference Values

 

TEST AGE % Activity

Antithrombin III Activity Assay

0 – 2 days

39 - 97

 

3 days – 30 days

N/A

 

31 days – 1 Year

N/A

 

1 Year - 5 Years

82 - 139

 

6 Years - 10 Years

90 - 131

 

11 Years - 17 Years

77 - 132

 

18 Years - 150 Years

83 - 128