I have been asked whether glucose results from our blood gas analyser are
equivalent to plasma glucose or whole blood glucose. This arose from a
discussion of whether we should quote a different reference range depending
on the method of analysis.
My preliminary scientific answer is that the electrode is in contact with
the plasma phase of the whole blood and therefore the result given is the
plasma glucose (just as the potassium result is the plasma potassium).
On the less scientific and more practical side, one could say that since
no-one is going to run their GTTs through this kind of system, and anyone
who gets a blood gas sample analysed is pretty sick, a few percent
difference doesn't really matter anyway.
The system in question is the Radiometer ABL 725, but the principle should
apply to any electrode-based system. Does anyone have a contrary opinion,
or data, so we don't have to do a comparison?
thanks
John Whitfield
Clinical Biochemistry
Royal Prince Alfred Hospital
Sydney, Australia
Phone (+61) 2 9515 5246
Fax (+61) 2 9515 7931
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