However, correlation studies the relationship between one variable and another, not the differences, and it is not recommended as a method for assessing the comparability between methods. Correlation and regression studies are frequently proposed. The correct statistical approach to assess this degree of agreement is not obvious. To the authors' knowledge, the present is the first report evaluating a PCA in the rabbit.In a contemporary clinical laboratory it is very common to have to assess the agreement between two quantitative methods of measurement. Limits of agreement provided for each variable allow researchers to evaluate if the PCA is reliable enough for their scope. The current study provides sufficient evidence that the PCA presents reliability for pH, although its low agreement with a reference analyzer for the other variables does not support their interchangeability. Most variables presented significant proportional and/or constant bias.

Limits of agreement were wide for all the variables studied, with the exception of pH. Bland-Altman plots and Passing-Bablok regression analysis were used to compare the results. Blood samples obtained from 30 pet rabbits were analyzed immediately after collection by the portable clinical analyzer (PCA) and immediately thereafter (time <20 sec) by a reference analyzer. The purpose of this study was to evaluate the performance of a portable clinical analyzer for measurement of pH, partial pressure of CO2, Na, chloride, potassium, blood urea nitrogen, glucose, hematocrit, and hemoglobin in healthy and diseased rabbits. Point-of-care testing is an attractive option in rabbit medicine, because it permits rapid analysis of a panel of electrolytes, chemistries, blood gases, hemoglobin, and hematocrit, requiring only 65 μL of blood.

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