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.
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, contact interface support at interface.support@aruplab.com.
Cross References
  • AHF
  • Antihemophilic Factor (AHF), Factor VIII:C (Coagulant Portion)
  • Coagulation Factor VIII Activity Assay, Plasma
  • Factor VIII Activity Assay
  • Intrinsic Factor Proteins
  • Intrinsic Factors