A very similar approach was used for the preparation of screen-printed biosensor arrays for the simultaneous detection of glucose, lactate and uric acid [24,31]. The preparation of the biosensing layers was simply achieved by drop and drying small droplets of enzyme containing buffer solutions (GOx, lactate oxidase or uricase) on their respective individual electrode modules. Zhao et al. described a biosensor array comprising of eight individual sets of electrodes, which were modified with potassium ferricyanide deposited with the enzyme mixture [31]. The current responses to the analytes were measured by amperometry on artificial urine, spiked with different concentrations of glucose, lactate or uric acid