Factor X Assay




Test Mnemonic

FXC

CPT Codes

  • 85260 - QTY (1)

LOINC ®

3218-5

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 ConditionFrozenDescription14 days at -20 C; 6 months at -70 C
Environmental ConditionRefrigeratedDescriptionUnacceptable

Days Performed

Mon - Fri

Turnaround Time

1 - 3 days

Methodology

Name Description
NameClotting AssayDescription 

Reference Range

Factor X Assay
Sex Age From Age To Type Range Range Unit
Factor X Assay Sex  DaysAge From1 DaysAge ToNormalType15 - 73Range%
Factor X Assay Sex2 DaysAge From5 DaysAge ToNormalType23 - 85Range%
Factor X Assay Sex6 DaysAge From30 DaysAge ToNormalType38 - 93Range%
Factor X Assay Sex1 MonthsAge From3 MonthsAge ToNormalType43 - 115Range%
Factor X Assay Sex4 MonthsAge From11 MonthsAge ToNormalType46 - 127Range%
Factor X Assay Sex1 YearsAge From5 YearsAge ToNormalType61 - 124Range%
Factor X Assay Sex6 YearsAge From10 YearsAge ToNormalType57 - 108Range%
Factor X Assay Sex11 YearsAge From16 YearsAge ToNormalType52 - 126Range%
Factor X Assay Sex17 YearsAge From99 YearsAge ToNormalType73 - 163Range%
Factor X Assay Sex  YearsAge From99 YearsAge ToUrgentTypeAfter Pathologist Review: < 5Range%

Special Info

This test is not the anti - Xa assay for heparin measurement. For heparin activity, order heparin anti - Xa assay. 3.2% sodium citrate is the preferred anticoagulant recommended by CLSI.

Clinical Info

To diagnose a bleeding disorder in a patient with a prolonged PT and normal PTT. In addition to congenital Factor X deficiency, low Factor X levels can be seen with coumadin therapy, vitamin K deficiency, liver disease and DIC.