Dear Colleagues,
 
A pharmacist has queried our target range for phenytoin of 5 - 20 mg/L.
 
Apparently this is at odds with a local guideline of 10 - 20 mg/L (and the Roche kit insert) and I have been asked to provide evidence to back up our range.
 
A brief glance at Mike Hallworth's and Ian Watson's book suggests our range reflects more up to date study evidence.
 
However, I have been able to locate a reference.
 
Could someone help point me towards a source.
 
Thanks
 
David Kennedy
Consultant Clinical Scientist / Head of Biochemistry
South of Tyne and Wear Clinical Pathology Services
QE Hospital Gateshead

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