Sample n° Nominal concentration of samples (M) RSD% ≤ 5.5 Found experimental concentration (M) RSD% ≤ 5.5 % Recovery RSD% ≤ 5.5
Direct Competitive Direct Competitive Direct Competitive
Human milk 2.00×10-7 (undiluted) 1.0×10-8 (≈ diluted 1:10) 1.99×10-7 0.988×10-8 99.5% 98.8%
Human serum 1.0×10-7 (undiluted) 1.0×10-8 (≈ diluted 1:10) 0.965×10-7 1.04×10-8 96.5% 104%
Table 4: Recovery tests for IgG in human serum and milk using direct and competitive immunosensor methods. Samples were suitably diluted before analysis.