“…They found that, for intra-assays, the relative standard deviation (RSD) varied from 3.1% to 7.8%, for inter-assay, the RSD varied from 6.8% to 11.6%. Ojeda et al (2012) found the reproducibility RSD values 7.2% and 5.9% for 0 and 12.5 ng/mL, respectively. They also measured amperometric responses of 16 immunosensors after 1 day, 1 week and 2 weeks and compared to those obtained on the first day.…”