The accuracy of the assays was evaluated through recovery experiments. For this purpose, three plasma blood samples from anonymous donors were spiked with known concentrations of CRP and D-dimer and the concentration of both analytes in each sample was determined both prior to and after the exogenous analyte addition. Due to the different concentration ranges of CRP and D-dimer in human plasma and the different working ranges of the calibration curves, for the simultaneous determination of two analytes in the recovery experiments a 50-times dilution was applied.