Coagulation Factor Assays
Department of Haematology
Notes
- Prolongation of the coagulation screen that can be significantly corrected by the addition of normal patient plasma may be the result of a specific factor deficiency.
- Specific assays of each of the coagulation factors can be performed to determine the nature of the deficiency.
- Samples that are under filled, overfilled or haemolysed give erroneous results and therefore will not be tested.
- Tested at CGH, GRH or Oxford Haemophilia Centre.
Sample Requirements
2 x 3ml or 3.5ml Trisodium Citrate tubes x 2
Turnaround Time
Urgent Factor VIII levels: within 4 hours
Routine: within 2 weeks
Please contact the laboratory in the first instance if urgent factor assays are required.
Reference Ranges
| Test | Range |
|---|---|
| Factor II | 50 - 150% |
| Factor V | 50 - 150% |
| Factor VII | 50 - 129% |
| Factor VIII | 50 - 150% |
| Factor IX | 65 - 150% |
| Factor X | 50 - 150% |
| Factor XI | 65 - 150% |
| Factor XII | 50 - 150% |
Further search terms : Coagulation Factor Assays FII FV FVII FVIII FIX FX FXI FXII II V VII VIII IX X XI XII 2 5 7 8 9 10 11 12