Figure 1. Mean Reliability (within-sample standard deviation (SD)) and Bias of the seven blood lactate analysers relative to the mean values obtained on the criterion analyser (Radiometer ABL90). The left panel show data for one device of each brand and the right panel show data for the second device of each brand including two laboratory based criterion analysers (Radiometer ABL90 and Radiometer 715). Each data point is the mean, or standard deviation, of an average of approximately six observations per sample.