Factor XI Assay




Test Mnemonic

FXIC

CPT Codes

  • 85270 - QTY (1)

LOINC ®

3226-8

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 XI Assay
Sex Age From Age To Type Range Range Unit
Factor XI Assay Sex  DaysAge From1 DaysAge ToNormalType10 - 91Range%
Factor XI Assay Sex2 DaysAge From5 DaysAge ToNormalType23 - 120Range%
Factor XI Assay Sex6 DaysAge From30 DaysAge ToNormalType27 - 109Range%
Factor XI Assay Sex1 MonthsAge From3 MonthsAge ToNormalType42 - 134Range%
Factor XI Assay Sex4 MonthsAge From11 MonthsAge ToNormalType39 - 185Range%
Factor XI Assay Sex1 YearsAge From5 YearsAge ToNormalType57 - 207Range%
Factor XI Assay Sex6 YearsAge From10 YearsAge ToNormalType53 - 165Range%
Factor XI Assay Sex11 YearsAge From16 YearsAge ToNormalType51 - 134Range%
Factor XI Assay Sex17 YearsAge From99 YearsAge ToNormalType68 - 175Range%
Factor XI 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.