Abstract
The effects of the protein matrices of selected human and animal based control materials on the Ektachem, Beckman and SMA 12 60 glucose and urea methods have been investigated by means of commutability studies. The commutability of control materials between the Ektachem and SMA 12 60 was greater than that between the Ektachem and Beckman methods and was similar to that reported for conventional methods. No trends were apparent amongst control sera from different species nor with different total protein levels. Some variation in commutability was found with different batches of Ektachem glucose and urea slides. In addition the effect of lyophilisation of fresh human serum on its analytical behaviour with different experimental batches of Ektachem glucose/urea slides was studied and found to be negligible.
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