One stage assay for factor XI
Tube
05 (CP) – Citrate
ID
12717
Availability
Daily (available 24/7)
Additional information
Uses an APTT based clotting method to perform a one stage assay. Only treatment assays done in Blood Sciences.
Send to
Specialist Coagulation
Chancellor / Lincoln Wing Link Corridor
Pathology
Block 32
St James University Hospital
Beckett Street
Leeds
LS9 7TF
Contact
Collection Con
Correctly filled citrate tubes. 1 for single factor assay, 2 for multiple factor assays.
Samples must be processed within 6 hours of being taken.
Sample REQ
Blood
Ref. Range (Male)
60 – 150
Ref. Range (Female)
60 – 150
Ref. Range (Paed)
See Comment
Ref. Range Notes
For paediatric reference ranges please refer to BJH Guideline 2002, 119, 295-309, The Investigation and Management of Neonatal Haemostasis and Thrombosis
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
IP Routine TAT
5 days
GP Acute TAT
Contact laboratory
GP Routine TAT
5 days