Figure 3. Comparison of methods for determining glucose concentrations in 15 urine samples, measured with an automat in the clinical laboratory setting and with the method described in this article. For two samples with glucose concentrations of 5.9 and 31.7 mM (measured with the automat), we measured average glucose concentrations (based on three separate measurements each) of 5.8 and 31.3 mM, respectively; the standard deviations were 0.5 and 0.05 mM, respectively.