Factor IX Assay




Test Mnemonic

FIXC

CPT Codes

  • 85250 - QTY (1)

LOINC ®

3187-2

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 IX Assay
Sex Age From Age To Type Range Range Unit
Factor IX Assay Sex  DaysAge From1 DaysAge ToNormalType21 - 97Range%
Factor IX Assay Sex2 DaysAge From5 DaysAge ToNormalType21 - 97Range%
Factor IX Assay Sex6 DaysAge From30 DaysAge ToNormalType29 - 86Range%
Factor IX Assay Sex1 MonthsAge From3 MonthsAge ToNormalType29 - 120Range%
Factor IX Assay Sex4 MonthsAge From11 MonthsAge ToNormalType50 - 144Range%
Factor IX Assay Sex1 YearsAge From5 YearsAge ToNormalType66 - 110Range%
Factor IX Assay Sex6 YearsAge From10 YearsAge ToNormalType88 - 95Range%
Factor IX Assay Sex11 YearsAge From16 YearsAge ToNormalType83 - 130Range%
Factor IX Assay Sex17 YearsAge From99 YearsAge ToNormalType77 - 173Range%
Factor IX Assay Sex  YearsAge From99 YearsAge ToUrgentTypeAfter Pathologist Review: < 5Range%

Special Info

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

Clinical Info

Detecting deficiency of factor IX in a patient with a prolonged PTT and normal PT. Factor IX deficiency is seen in hemophilia B, but is also seen with liver disease, vitamin K deficiency, coumadin therapy or DIC.