Table 1

hCG (ng/mL)	Equivalent circuit elements for nonfaradaic interface
hCG (ng/mL)	R (kΩ)	C (mF)	R (kΩ)
Blank	90.47 ± 5.42	2.55 ± 0.15	1.54 ± 0.04
1	98.24 ± 5.97	1.75 ± 0.12	1.50 ± 0.07
5	98.37 ± 1.24	1.59 ± 0.09	1.59 ± 0.03
10	106.57 ± 3.49	1.66 ± 0.08	1.51 ± 0.09
20	111.40 ± 3.90	1.48 ± 0.10	1.57 ± 0.04
30	116.40 ± 3.90	1.64 ± 0.05	1.55 ± 0.07
40	129.47 ± 0.31	1.69 ± 0.09	1.53 ± 0.07
50	132.93 ± 0.40	1.51 ± 0.10	1.52 ± 0.07
70	148.87 ± 5.28	1.25 ± 0.12	1.61 ± 0.05

Table 1: Impedance parameters were obtained from the equivalent circuit fit to the impedance spectra of immunosensor A, which is presented in Figure 4a.