Factor VIII Assay




Test Mnemonic

FVIIIC

CPT Codes

  • 85240 - QTY (1)

LOINC ®

3209-4

Performing Laboratory

n/a


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
2 mLPlasmaSodium citrate (Lt. Blue) FrozenIndicate previous prothrombin and partial thromboplastin time results on requisition.

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
1 mL     

Stability

Environmental Condition Description
Ambient4 hours
RefrigeratedUnacceptable
Frozen14 days at -20 C; 6 months at -70 C

Days Performed

Mon - Fri

Turnaround Time

1 - 3 days

Methodology

Name Description
Clotting Assay 

Reference Range

Factor VIII Assay
Sex Age From Age To Type Range Range Unit
   Days1 DaysNormal22 - 207%
 2 Days5 DaysNormal22 - 179%
 6 Days30 DaysNormal26 - 182%
 1 Months3 MonthsNormal34 - 145%
 4 Months11 MonthsNormal38 - 127%
 1 Years5 YearsNormal59 - 165%
 6 Years10 YearsNormal58 - 153%
 11 Years16 YearsNormal53 - 152%
 17 Years99 YearsNormal50 - 173%
   Years99 YearsUrgentAfter Pathologist Review: < 5%

Special Info

3.2% sodium citrate is the preferred anticoagulant recommended by CLSI.

Clinical Info

To diagnose a bleeding disorder in a patient with a prolonged PTT and normal PT. Factor VIII levels are seen in hemophilia A, von Willebrand disease and with FVIII inhibitors.

Clinical Limitation

n/a

Clinical Reference

n/a