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
Centre for Laboratory Medicine
St James University Hospital
Beckett Street
Leeds
LS9 7TF
Contact
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