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
[LINK To Specialist Coagulation]
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