Abstract— A simple low-cost (<60 USD) Arduino based laser nephelometric instrument, which is suitable for high sensitive immunoprecipitation detection is presented. A measuring range of up to 49 mg/L of dog C-Reactive Protein (CRP) is reported. Furthermore, the limit of detection (LOD) is determined to be 2.1 mg/L. Only 24 µL of dog serum samples are required. Assay-time is 6 minutes. We successfully demonstrated the good performance of the device on two low level (0 and 10.2 mg/L CRP) dog serum samples. The coefficient of variation (CV) was 10% at the level of 10.2 mg/L.
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