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Table 4 Performance of the tests at cut-off points deemed to return the maximum sum of sensitivity and specificity, as determined by receiver operating characteristic curves [42]. Positive and negative predictive values have been calculated based on the reported prevalence of FPT in Irish calves [14]

From: Comparison of rapid laboratory tests for failure of passive transfer in the bovine

Test

Cut-off to maximise correct classification

Sensitivity(95 % CI)

Specificity (95 % CI)

% of animals classified correctly

Positive predictive value

Negative predictive value

GGT

100 IU/L

0.9726(0.9045–0.9967)

0.9811(0.8993–0.9995)

98 %

0.9901

0.9486

ELISA

8 mg/ml

0.9726(0.9045–0.9967)

1.0000(0.9328–1.0000)

98 %

1.0000

0.9758

Globulin

16 mg/ml

0.9863(0.9260–0.9997)

0.8868(0.7697–0.9573)

94 %

0.9442

0.9709

STP

45 mg/ml

0.9726(0.9045–0.9967)

0.7358(0.5967–0.8474)

87 %

0.8772

0.9326

ZST

11 units

0.8082(0.6992–0.8910)

0.8302(0.7020–0.9193)

82 %

0.9023

0.6904