Test Code FXI Factor XI Assay, Plasma
Performing Laboratory
ChristianaCare-Newark Campus
Methodology
Clot-Based Assay
Reference Values
>6 months: 50-150%
<6 months: Contact the Coagulation Laboratory at 302-733-3708
Physician Office Specimen Requirements
Container/Tube: 2.7-mL light blue-top
(sodium citrate) tube
Specimen: Full tube - must be filled to
exactly 2.7 mL
Collection Instructions:
Note: Label tube with patient’s full name and 1 additional unique patient identifier such as date of birth, medical record number, emergency ID number, date and time of draw, collector’s initials, and type of specimen.
Day(s) Test Set Up
Monday through Friday
Routine Turnaround Time: 6 hours
STAT Turnaround Time: 2 hours