**Methods ** |
**DIRECT METHOD**
Geometry of the test: conjugation between IgG, immobilized on the membrane of immunosensor and the excess of urease conjugated anti-IgG, free in solution.
(a) |
**COMPETITION METHOD**
Geometry of the test: competition between IgG, immobilized on the membrane of immunosensor, and IgG free, for the urease conjugated anti-IgG, free in solution
(b) |

Regression equation
(Y= a.u., X= M)
Confidence level (1-α) = 0.95; |
Y = -19.4 (± 3.1) × -77.9 (± 13.4)
(n–*v*) = 6 ; (t=2.45) |
Y = -41.3 (± 4.3) log × -323.9 (± 18.4)
(n–*v*) = 9 ; (t=2.26) |

Linear range (M) |
2×10^{-5} - 7×10^{-8} |
6.0×10^{-8} ÷ 3×10^{-10} |

Correlation coefficient |
0.9813 |
0.9801 |

Repeatability of the
measurement
(as pooled SD%) |
6.8 |
8.6 |

Low detection limit
(LOD) (M) |
4×10^{-8} |
1.7×10^{-10} |

Instrumental response time (minutes) |
@ 10 |
@ 15 |