Turnaround times
The quoted turnaround time is from sample receipt in the laboratory, to results authorisation in the Laboratory Information Management system. The times do not include transport of specimen to the laboratory or the administrative process to print and post/email reports. Service users must allow for transport and reporting time when ordering tests.
Clinical background:
Refixia is pegylated Haemophilia B FIX prophylaxis for the treatment and prevention of bleeding episodes. Due to interference from the polyethylene glycol (PEG) in one-stage clotting assays with our standard aPTT reagent (SynthasIL), a modified one stage FIX must be performed using an alternative, non-silica based aPTT reagent (SynthAFax).
Specimen container paediatric:
Light blue – sodium citrate
Specimen container adult:
Light blue – sodium citrate
Minimum volume paediatric:
1.3mL
Minimum volume adult:
2.7mL
Special requirements:
Tube must be correctly filled to line, to ensure correct ratio of blood to anticoagulant, ensure adequate mixing.
Sample stability:
4 hours
Transport requirements:
Samples should be transported to lab without delay
Freq analysis:
As required or weekly
Add on test:
[email protected] (external)
Quality assurance:
UK NEQAS
Factors affecting result:
SynthAFax reagent must be mixed well by inversion several times prior to use
Other info:
The Refixia assay is a Factor IX assay which uses Hemosil SynthAFax as the APTT reagent