Factor VIII, Activity
0030095
Ordering Recommendation
Order to diagnose hemophilia A, acquired factor VIII deficiency, or as part of a diagnostic workup for von Willebrand disease. Not recommended when screening for thrombophilia.
Mnemonic
F8
Methodology
Clotting
Performed
Mon-Sat
Reported
1-3 days  
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
Specimen Required
Patient Preparation
  
Collect
Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.  
Specimen Preparation
Transfer 2 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL)  
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.  
Unacceptable Conditions
Serum. Non-frozen or hemolyzed specimens.  
Remarks
 
Stability
Ambient: 4 hours; Refrigerated: Unacceptable; Frozen at -20° C: 3 months; Frozen at -70° C: 6 months  
Reference Interval
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%  
Interpretive Data
 
Note
 
CPT Code(s)
85240
Components
Component Test Code*Component Chart Name
0030095Factor VIII, Activity
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • AHF
  • Antihemophilic Factor (AHF), Factor VIII:C (Coagulant Portion)
  • Coagulation Factor VIII Activity Assay, Plasma
  • Factor VIII Activity Assay
  • Intrinsic Factor Proteins
  • Intrinsic Factors