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Factor VIII, Plasma
MessageOff campus clinics must send the patient to Cox South Outpatient Laboratory. Send order to Centralized Scheduling.
Test Code
65
CPT Codes
85240
Preferred Specimen
Container/Tube: Light blue-top (citrate) tube-
Specimen Volume: Full tube
Collection Instructions: Blood to anticoagulant ratio is critical.
Note: 1. Results may be affected by hematocrit >55%.
2. Tube should remain stoppered.
Transport Temperature
Refrigerate <=30 minutes
Specimen Stability
Specimen must arrive within 30 minutes of draw.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly hemolyzed, clotted blood, or an insufficient specimen is not acceptable.
Methodology
Partial Thromboplastin Time-Based Clotting Method/Standard Curve from Reference Plasma
Setup Schedule
Monday through Sunday
Reference Range
40-150% activity compared to normal plasma pool
Clinical Significance
Useful for evaluating and monitoring hemophilia A and von Willebrand disease.
Performed By
CoxHealth