Intrinsic factor assays
One stage factor assays for factors VIII, IX, XI and XII
| Tube | 05 (CP) - Citrate |
|---|---|
| ID | 12740 |
| Availability | Weekdays |
| Additional Information | The clotting time (APTT) of a sample is adapted to measure the level of a single coagulation factor by the addition of plasma that is deficient only in the required clotting factor. |
| Send to | Specialist Coagulation Chancellor / Lincoln Wing Link Corridor Pathology Block 32 St James University Hospital Beckett Street Leeds LS9 7TF |
| Contact | https://www.leedsth.nhs.uk/a-z-of-services/pathology-2/specialist-laboratory-medicine-slm/specialist-coagulation/?stage=Stage |
| Collection Con | Correctly filled citrate tubes. 2 required for multiple factor assays Samples must be processed within 6 hours of being taken. |
| Sample REQ | Blood |
| Ref. Range (Male) | 50-150iu/dL (FXI 60-150iu/dL) |
| Ref. Range (Female) | 50-150iu/dL (FXI 60-150iu/dL) |
| Ref. Range (Paed) | See Note |
| Ref. Range Notes | "For paediatric reference ranges please refer to Thromb Haemost 2006, 95, 362-72. Developmental haemostasis. Critical telephone values: Any abnormal factor assay with clinical details: bleeding. Factor assays less than 10% (unless on a patient known to have a factor deficiency)" |
| Units | iu/dL |
| IP Acute TAT | Contact Laboratory before requesting |
| IP Routine TAT | 5 days |
| GP Acute TAT | Contact Laboratory before requesting |
| GP Routine TAT | 5 days |
| Telepath | INTJ (F8J, F9J, F11J, F12J) |
| ICE Codes | LINT |
