Test Code F8G Factor VIII Antigen
Specimen Required
1 mL frozen platelet-poor plasma
Specimen Minimum Volume
0.5 mL
Specimen Stability
Plasma
Room temperature: 4 hours
Refrigerated: 48 hours
Frozen (-20C): 30 days Frozen (-70C): 6 months
Report Available
2-31 days
Method Name
Immunoassay (IA)
Collection Container / Tube
Preferred: 3.2 % sodium citrate (light blue top)
Other Acceptable Container: None
Transport / Storage Conditions
Frozen
Special Instructions
Platelet poor plasma: Centrifuge light blue-top tube for 15
minutes at approximately 1500 g within 60 minutes of collection.
Using a plastic pipette, remove plasma, taking care to avoid the
WBC/platelet buffy layer and place into a
plastic screw-cap vial. Centrifuge a second time and transfer
platelet-poor plasma into a new plastic screw-cap vial. Plasma must
be free of platelets (<10, 000/mcL). Freeze immediately and ship
on dry ice. Do not thaw.
Reference Values
0.60-1.95 IU/mL
Day(s) Performed
As needed: at least 1x/month
CPT Codes
85244
Alias/See Also
LAB9290
Factor 8 antigen