Considering the clinically relevant range of CRP in serum (95–1.9 × 103 nM; 10 × 103–200 × 103 μg/L) for the detection of bacterial infections [28,29] our linear range were within this range after appropriate dilution, but not fully covered because the response current reached a plateau at a higher CRP concentration. The gene discussed is CRP; the disease is bacterial infectious disease.