FACTOR VIII ACTIVITY

Test Documentation
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: Unacceptable; Frozen: 3 months

Reference Range
0-6 years:   56-191%  
7-9 years:   76-199%  
10-11 years:   80-209%  
12-13 years:   72-198%  
14-15 years:   69-237%  
16-17 years:   63-221%  
18 years and older:   56-191%  

Performed
Monday-Saturday

Turnaround Time5-7 days
Test CodeF8AR
CPT-4 Code (s)
85240
LOINC Codes
3209-4

Warde
Medical
Laboratory