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
2 mLPlasmaSodium citrate (Lt. Blue) FrozenIndicate previous prothrombin and partial thromboplastin time results on requisition.

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
1 mL     

Stability

Environmental Condition Description
Ambient4 hours
RefrigeratedUnacceptable
Frozen14 days at -20 C; 6 months at -70 C

Days Performed

Mon - Fri

Turnaround Time

1 - 3 days

Methodology

Name Description
Clotting Assay 

Reference Range

Factor XI Assay
Sex Age From Age To Type Range Range Unit
   Days1 DaysNormal10 - 91%
 2 Days5 DaysNormal23 - 120%
 6 Days30 DaysNormal27 - 109%
 1 Months3 MonthsNormal42 - 134%
 4 Months11 MonthsNormal39 - 185%
 1 Years5 YearsNormal57 - 207%
 6 Years10 YearsNormal53 - 165%
 11 Years16 YearsNormal51 - 134%
 17 Years99 YearsNormal68 - 175%
   Years99 YearsUrgentAfter Pathologist Review: < 5%

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.