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Table 1 Diagnostic test characteristics for STIGA in colostrum

From: Determining the IgG concentrations in bovine colostrum and calf sera with a novel enzymatic assay

Cut point, OD 450

Accuracy,%

Se, %

Sp, %

PPV, %

NPV, %

Dairy colostrum

 0.6

75.0

11.8

100.0

100.0

74.1

 0.7

78.3

23.5

100.0

100.0

76.8

 0.8

85.0

47.1

100.0

100.0

82.7

 0.9

85.0

64.7

93.0

78.6

87.0

 1.0

78.3

76.5

79.1

59.1

89.5

 1.1

75.0

88.2

69.8

53.6

93.8

 1.2

68.3

94.1

58.1

47.1

96.2

Beef colostrum

 0.6

84.4

25.0

98.1

75.0

85.0

 0.7

90.6

66.7

96.2

80.0

92.6

 0.8

89.1

83.3

90.4

66.7

95.9

 0.9

79.7

100.0

75.0

48.0

100.0

 1.0

71.9

100.0

65.4

40.0

100.0

 1.1

53.1

100.0

42.3

28.6

100.0

 1.2

42.2

100.0

28.8

24.5

100.0

  1. Accuracy, sensitivity (Se), specificity (Sp), positive predictive value (PPV) and negative predictive value (NPV) calculated for OD cut points for detecting adequate quality colostrum with STIGA with cut-offs of 50 mg/mL IgG for dairy colostrum and 100 mg/mL of beef colostrum determined by RID; for dairy colostrum (n = 60) and beef colostrum(n = 64)