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It is certainly not sufficient for a GP practice just to say that it is their policy or internal procedure
As B12 serum is going to be tested it may be interesting as the last time that was tested I was over 2000 whatevers so if it is any less it would add to the evidence that the vials were deteriorating over time
There are four of them, and they interact with each other in ways that make simple comparisons misleading
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