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Table 2 Results of sensitivity, specificity, PPV, and NPV of SPR array compared to ELISA assay results

From: Rapid identification of Mycobacterium tuberculosis infection by a new array format-based surface plasmon resonance method

Antigen numbera Sensitivity (%)b Specificity (%)b PPV (%)b NPV (%)b
  SPR ELISA SPR ELISA SPR ELISA SPR ELISA
W06 79 10 96 100 96 100 82 52
W10 45 38 100 96 100 92 64 60
W14 59 24 100 96 100 88 70 55
W19 31 62 96 79 90 75 57 67
W28 86 34 93 96 93 91 87 59
W38 79 24 100 100 100 100 82 56
W64 69 17 100 93 100 71 76 53
W70 14 24 100 100 100 100 53 56
W85 76 28 96 96 96 89 79 56
Multi-Ag 100 90 89 57 91 68 100 84
  1. aA total of nine M. tuberculosis related antigens were used for the test. bResults shown were averages of three independent experiments. PPV, positive predictive value; NPV, negative predictive value; SPR, surface plasmon resonance; ELISA, enzyme-linked immunosorbent assay; Ag, antigen.