Factor XII Assay




Test Mnemonic

FXIIC

CPT Codes

  • 85280 - QTY (1)

LOINC ®

3232-6

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 XII Assay
Sex Age From Age To Type Range Range Unit
Factor XII Assay Sex  DaysAge From1 DaysAge ToNormalType15-124Range%
Factor XII Assay Sex2 DaysAge From5 DaysAge ToNormalType12-110Range%
Factor XII Assay Sex6 DaysAge From30 DaysAge ToNormalType19-108Range%
Factor XII Assay Sex1 MonthsAge From3 MonthsAge ToNormalType28-145Range%
Factor XII Assay Sex4 MonthsAge From11 MonthsAge ToNormalType44-153Range%
Factor XII Assay Sex1 YearsAge From5 YearsAge ToNormalType71-172Range%
Factor XII Assay Sex6 YearsAge From10 YearsAge ToNormalType67-186Range%
Factor XII Assay Sex11 YearsAge From16 YearsAge ToNormalType38-182Range%
Factor XII Assay Sex17 YearsAge From999 YearsAge ToNormalType58-218Range%

Special Info

Patient Preparation: If possible, discontinue heparin therapy 2 days prior to test. Failure to follow patient preparation instructions above will render results invalid. 3.2% sodium citrate is the preferred anticoagulant recommended by CLSI.

Clinical Info

To diagnose a factor deficiency in a patient with a prolonged PTT and normal PT.