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 mL | Plasma | Sodium citrate (Lt. Blue) | Frozen | Indicate 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 |
|---|---|
| Ambient | 4 hours |
| Refrigerated | Unacceptable |
| Frozen | 14 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 |
| Days | 1 Days | Normal | 10 - 91 | % | 2 Days | 5 Days | Normal | 23 - 120 | % | 6 Days | 30 Days | Normal | 27 - 109 | % | 1 Months | 3 Months | Normal | 42 - 134 | % | 4 Months | 11 Months | Normal | 39 - 185 | % | 1 Years | 5 Years | Normal | 57 - 207 | % | 6 Years | 10 Years | Normal | 53 - 165 | % | 11 Years | 16 Years | Normal | 51 - 134 | % | 17 Years | 99 Years | Normal | 68 - 175 | % | Years | 99 Years | Urgent | After 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.