Table 3.

Diagnostic test characteristics for STIGA in blind study

	Cut point, OD 450	Accuracy, %	Se, %	Sp, %	PPV, %	NPV, %
Colostrum	0.5	90	100	71.43	86.67	100
Serum	0.4	96	100	94.73	85.71	100

Accuracy, sensitivity (Se), specificity (Sp), positive predictive value (PPV), and negative predictive value (NPV) calculated for OD cut point for detecting adequate quality colostrum with STIGA with cut-offs of 50 mg/mL IgG for dairy colostrum and for detecting FTPI with STIGA with cut-offs of 10 mg/mL IgG for dairy calf sera determined by RID; for dairy colostrum (n = 25) and dairy calf sera (n = 20)