FACTOR XI ACTIVITY

Specimen Required
Draw blood in a light blue 3.2% sodium citrate tube. See appendices for coagulation test collection instructions. Send 2.0 mL plasma (1.0 mL minimum) frozen in a screw-capped plastic vial.

Rejection Criteria
Serum, non-frozen or hemolyzed specimens

Methodology
Clotting

Stability
Room Temperature: 4 hours; Refrigerated: 4 hours; Frozen: 14 days

Reference Range
1-4 days:   10-66%  
5-29 days:   23-87%  
30-89 days:   27-79%  
90-179 days:   41-97%  
180-364 days:   38-134%  
1-5 days:   56-150%  
6 years:   52-120%  
7-9 years:   70-138%  
10-11 years:   66-137%  
12-13 years:   68-138%  
14-15 years:   57-129%  
16-17 years:   65-159%  
16 years and older:   56-153%  

Performed
Monday-Friday

Turnaround Time5-7 days
Test CodeF11AR
CPT-4 Code (s)
85270
LOINC Codes
3226-8

Warde
Medical
Laboratory