Performance of BinaxNOW for Diagnosis of Malaria in a U.S. Hospital

Microscopic diagnosis and species identification of Plasmodium in areas of nonendemicity provide a robust method for malaria diagnosis but are technically challenging. A prospective study was conducted to measure the performance of BinaxNOW compared to microscopy (the gold standard) in a U.S. teaching hospital. Overall, BinaxNOW was 84.2% sensitive and 99.8% specific. Excluding patients on antimalarial therapy, the sensitivity was 92.9%. Importantly, BinaxNOW initially misclassified a case of Plasmodium falciparum malaria as non-falciparum. These results support the judicious use of BinaxNOW in screening of individuals suspected of having malaria in areas of nonendemicity.