The Oral Glucose Tolerance Test—An Assessment of the Quality of its Performance

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Abstract
By means of a questionnaire, an attempt was made to assess the quality of performance and interpretation of the oral glucose tolerance test by laboratories participating in the UK External Quality Assessment Scheme for Clinical Chemistry. The results showed a general awareness of current recommendations in terms of both protocol for the test and criteria for interpretation of results, but some deficiencies were observed in both these areas and in some case deviations in protocol may have been sufficient to invalidate comparison of results with currently recommended criteria for interpretation of the test.