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Clinical Chemistry 34: 1966-1970, 1988;
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Clinical Chemistry, Vol 34, 1966-1970, Copyright © 1988 by American Association for Clinical Chemistry

Rate and delta checks compared for selected chemistry tests

DA Lacher and DP Connelly
Department of Pathology, Medical College of Ohio, Toledo 43699.

We compared delta and "rate" check methods for 12 selected chemistry tests. Rate checks were determined by dividing delta checks by inter- specimen interval time. The delta and rate check methods were based on differences and percent change of untransformed and absolute value- transformed values. The distribution of delta differences was not symmetrical for calcium, alkaline phosphatase, aspartate aminotransferase, or phosphorus, which led to different check limits between untransformed and absolute value-transformed methods. The dispersion of rate checks was large. The interval time between two consecutive tests was multimodal, which probably reflected adherence to fixed testing protocols.




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Copyright © 1988 by the American Association for Clinical Chemistry.