Factor XII Inhibitor Assay

Test Code

CPT Codes
85280, 85730, 85732 (x3)

aPTT; aPTT 1:1 Normal Pool Mix; aPTT 1:1 saline mix; aPTT 1:1 Normal Pool Mix 60 min. incubation, aPTT 1:1 Normal Pool Mix 60 min. incubation control, Factor XII Activity, Factor XII Bethesda Titer. (Bethesda titer is not indicated and is not performed if the factor activity is > 40%.)

Preferred Specimen
2 mL citrated frozen plasma (x3) each collected in 3.2% sodium citrate (light blue-top) tubes

Minimum Volume
1 mL (x3) each

Centrifuge plasma specimens within 30 minutes of collection, immediately separate plasma from the cells into 3 clean, plastic, screw-capped vials (2 mL each), freeze, and send 3 frozen samples in the same shipping container.

Transport Container
Plastic screw-cap vials

Transport Temperature

Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 30 days

Clotting Assay

Setup Schedule
Set up: Mon-Fri a.m.; Report available: 4 days

Reference Range
See Laboratory Report

Performing Laboratory
Esoterix Coagulation
8490 Upland Drive, Suite 100
Englewood, CO 80112

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.