ARUP's Laboratory Test Directory

Antithrombin, Enzymatic (Activity) : 0030010

Mnemonic: AT3

Ordering Recommendation: Recommended test to detect antithrombin deficiency.
Methodology: Chromogenic Assay
Performed: Sun-Sat
Reported: 1-2 days
Specimen Required: 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.

Remarks:

Unacceptable Conditions: Serum. Non-frozen or hemolyzed specimens.

Stability (collection to initiation of testing): 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%
CPT Code(s): 85300
Cross References: Antithrombin Activity, Plasma (Antithrombin, Enzymatic (Activity)), Antithrombin III Activity (Antithrombin, Enzymatic (Activity)), Antithrombin III, Functional (Antithrombin, Enzymatic (Activity)), AT III Activity (Antithrombin, Enzymatic (Activity)), AT3 Activity (Antithrombin, Enzymatic (Activity))