Objective: to analyze the knowledge of nurse working in intensive care unit (ICU) on arterial gasometry (AG). Method: a descriptive study with, quantitative, performed in a public hospital in Fortaleza-CE, from February to March 2011, with 45 nurses. We used Statistic Package for Social Sciences to analyze the data. The research was approved by ethics committee of the hospital with no. 091211/10. Results: parti...