This is a semi-quantitative assay based on the amount of antibodies to FVIII in the plasma of Haemophilia A patients.
Reported in Bethesda units or as absent.
Tube
05 (CP) – Citrate
ID
12722
Availability
Weekdays
Additional information
The assays can be adapted to be sensitive to other clotting factors. One Bethesda unit is defined as the amount of antibody that can neutralise 50% of the FVIII in normal plasma when incubated together for 2 hours at 37C.
Send to
Specialist Coagulation
Chancellor / Lincoln Wing Link Corridor
Pathology
Block 32
St James University Hospital
Beckett Street
Leeds
LS9 7TF
Contact
Collection Con
All citrate tubes filled to line please – 2 citrate samples required.
Samples must be processed within 6 hours of being taken.
Sample REQ
Blood
Ref. Range Notes
Critical telephone values: All new / relapsed positive bethesda assays will be phoned to the appropriate haematology consultant.
Normal patients have no inhibitor present.
Units
Bethesda units
IP Routine TAT
5 days