Comparative evaluation of two chromogenic tests for rapid detection of carbapenemase in Enterobacteriaceae and in Pseudomonas aeruginosa isolates

We compared the performance of the Carba NP test and the Rosco Rapid CARB screen kit for detecting carbapenemase-producing Enterobacteriaceae and Pseudomonas aeruginosa. Both tests are rapid and highly sensitive; however, the Carba NP test showed superior specificity, and several uninterpretable results were observed with the Rapid CARB screen.