Antithrombin, Enzymatic (Activity)
0030010
Ordering Recommendation
Recommended test to detect antithrombin deficiency.
Submit With Order
Mnemonic
AT3
Methodology
Chromogenic Assay
Performed
Sun-Sat
Reported
1-2 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
 
Collect
Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.  
Specimen Preparation
Transfer 1.5 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL)  
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.  
Unacceptable Conditions
Serum. Non-frozen or hemolyzed specimens.  
Remarks
 
Stability
Ambient: 4 hours; Refrigerated: 8 hours; Frozen: 1 month  
Reference Interval
1-4 days: 39-87%
5-29 days: 41-93%
30-89 days: 48-108%
90-179 days: 73-121%
180-364 days: 84-124%
1-5 years: 82-139%
6 years: 90-131%
7-9 years: 90-135%
10-11 years: 90-134%
12-13 years: 90-132%
14-15 years: 90-131%
16-17 years: 87-131%
18 years and older: 76-128%
Interpretive Data
Note
CPT Code(s)
85300
Components
Component Test Code*Component Chart Name
0030010Antithrombin, Enzymatic (Activity)
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Cross References
  • Antithrombin Activity, Plasma
  • Antithrombin III Activity
  • Antithrombin III, Functional
  • AT III Activity
  • AT III Activity/Functional
  • AT3 Activity
  • AT3 Activity/Functional