ANTITHROMBIN III ACTIVITY, FUNCTIONAL

Test Code

AT3AC

CPT Codes
85300

Preferred Specimen

1 Blue tube (Sodium Citrate)

Minimum Volume

1 mL

Other Acceptable Specimens

None

Instructions

Refer to the document Obtaining A Platelet-Poor Sample below.

Transport Temperature

Refrigerate or freeze

Specimen Stability

2-8°C up to 2 days
-20°C or lower up to 30 days

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

Hemolyzed samples; clotted; citrate tube underfilled or overfilled; sample received more than 2 days after collection (has not been centrifuged and frozen)

Methodology
Chromogenic

Setup Schedule

Tu, Th

Report Available

Within 24 hours of day tested.

Reference Range

84 - 160%

Clinical Significance

Evaluate response to heparin, liver function, and identify hypercoaguability. If blood is drawn from an indwelling catheter, flush line with saline and the first 5ml of blood discarded. Do not thaw and refreeze.

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NHMC (Hematology, IL Coag)

Additional Information
Obtaining A Platelet-Poor Sample
BD Vacutainer Plus Blue Top Volume Guide

Last Updated: August 3, 2023

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.