Laboratory Services

Coagulation Factor XI Activity Assay, Plasma

Print this page

Updated Test Information:

Test Description
Coagulation Factor XI Activity Assay, Plasma
Synonym(s)

Factor 11, UOW1218

Test ID
F11
General Information

Clinical assay interference and limitations: Patients on bivalirudin (Angiomax), dabigatran (Pradaxa), argatroban (Novastan), rivaroxaban (Xarelto), apixaban (Eliquis), and edoxaban (Savaysa) may show prolonged clotting times. This may cause an under- estimation of the factor concentrations. Emicizumab (Hemlibra) will affect all PTT-based assays and will overestimate the factor concentrations.


Outside clients should fill and submit Coagulation Patient Clinical History Form

Container Type

3 or 5 mL Blue Top (Citrate) tube

Specimen Type

Blood

Specimen Requirements

Entire Specimen

Specimen Collection / Processing Instructions

The Laboratory MUST process specimen, within 4 hrs of blood collection.


Centrifuge for 10 minutes, remove plasma & re-spin plasma for another 10 minutes. Decant & Freeze plasma (minimum 1.0 mL) @ -20°C to -80°C. Send frozen on dry ice.

Department (code)

Coagulation (COAG)

Methodology

Stago STA Clottable Factor assay

Estimated TAT

By end of next business day

Testing Schedule

Monday - Friday

CPT Code(s)

85270

Reference Range File View/Download File
STAT Orderable (Y/N)

Yes

Performing Lab

UW

LOINC Code(s)