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 |
|---|---|---|---|---|---|
| 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 |
| Frozen | 14 days at -20 C; 6 months at -70 C |
| Refrigerated | Unacceptable |
Days Performed
Mon - Fri
Turnaround Time
1 - 3 days
Methodology
| Name | Description |
|---|---|
| Clotting Assay |
Reference Range
| Factor X Assay | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Days | 1 Days | Normal | 15 - 73 | % | 2 Days | 5 Days | Normal | 23 - 85 | % | 6 Days | 30 Days | Normal | 38 - 93 | % | 1 Months | 3 Months | Normal | 43 - 115 | % | 4 Months | 11 Months | Normal | 46 - 127 | % | 1 Years | 5 Years | Normal | 61 - 124 | % | 6 Years | 10 Years | Normal | 57 - 108 | % | 11 Years | 16 Years | Normal | 52 - 126 | % | 17 Years | 99 Years | Normal | 73 - 163 | % | Years | 99 Years | Urgent | After Pathologist Review: < 5 | % |
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.