The Bayer 840 Blood Gas System is used for the determination of pH, pCO2 and pO2. Calculated parameters for the Bayer 840 include standard or actual bicarbonate (HCO3), total carbon dioxide (tCO2), base excess of blood [BE(B)] and of extracellular fluid [BE(ecf)], base excess in vivo or in vitro (BEvv or BEvt), estimated Oxygen saturation (O2 sat), estimated Oxygen content (O2 CT), temperature corrected pH, temperature corrected pCO2, temperature corrected O2, temperature corrected alveolar-arterial oxygen tension difference, temperature corrected arterial-alveolar oxygen tension ration, and temperature corrected respiratory index. Features of the Bayer 840 Blood Gas System include fully automated sample delivery, plus automated sample entry, easy analysis of sample types and devices with small sample size, easy to use, menu-driven software and on-screen prompts. Software is customizable to meet your laboratory requirements. The 840 has automatic calibration at intervals that you select, QC ranges, patient reference ranges, and printing options that you can customize, flags for results that fall outside expected ranges, and the capacity to store 1500 patient sample reports. The 840 has all measured parameters for one month’s QC data displayed on the screen, quality control tracking, reduced number of system parts and system complexity, and waste system designed for bio-safety. Other features of the Bayer 840 Blood Gas Analyzer include automatic, reagent-path cleaning cycle, advanced on-board data management, archive and backup capabilities, and on-board roll printer with paper take-up spool.