Diagnostic efficiency curves (ROC curves) for the Brucellacapt test, the Coombs test, and SAT. Area below the ROC curve: Brucellacapt, 0.97852 (95% CI, 0.95109 to 0.99286); Coombs test, 0.97611 (95% CI, 0.94781 to 0.99146); SAT, 0.91013 (95% CI, 0.86649 to 0.94317).