Factor VIII Assay




Test Mnemonic

FVIIIC

CPT Codes

  • 85240 - QTY (1)

LOINC ®

3209-4

Performing Laboratory

Cleveland Clinic Laboratories


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
Volume2 mLTypePlasmaContainerSodium citrate (Lt. Blue)Collect Temperature Transport TemperatureFrozenSpecial InstructionsIndicate previous prothrombin and partial thromboplastin time results on requisition.

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
Volume1 mLType Container Collect Temperature Transport Temperature Special Instructions 

Stability

Environmental Condition Description
Environmental ConditionAmbientDescription4 hours
Environmental ConditionRefrigeratedDescriptionUnacceptable
Environmental ConditionFrozenDescription14 days at -20 C; 6 months at -70 C

Days Performed

Mon - Fri

Turnaround Time

1 - 3 days

Methodology

Name Description
NameClotting AssayDescription 

Reference Range

Factor VIII Assay
Sex Age From Age To Type Range Range Unit
Factor VIII Assay Sex  DaysAge From1 DaysAge ToNormalType22 - 207Range%
Factor VIII Assay Sex2 DaysAge From5 DaysAge ToNormalType22 - 179Range%
Factor VIII Assay Sex6 DaysAge From30 DaysAge ToNormalType26 - 182Range%
Factor VIII Assay Sex1 MonthsAge From3 MonthsAge ToNormalType34 - 145Range%
Factor VIII Assay Sex4 MonthsAge From11 MonthsAge ToNormalType38 - 127Range%
Factor VIII Assay Sex1 YearsAge From5 YearsAge ToNormalType59 - 165Range%
Factor VIII Assay Sex6 YearsAge From10 YearsAge ToNormalType58 - 153Range%
Factor VIII Assay Sex11 YearsAge From16 YearsAge ToNormalType53 - 152Range%
Factor VIII Assay Sex17 YearsAge From99 YearsAge ToNormalType50 - 173Range%
Factor VIII Assay Sex  YearsAge From99 YearsAge ToUrgentTypeAfter Pathologist Review: < 5Range%

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.