Comparison of Blood Gas and Electrolyte Test Results From the Gem-Stat and CDI-300 Versus a Conventional Laboratory Analyzer

Continuous blood gas monitoring devices have been an aid to the perfusionist since the introduction of the oxygen saturation meters of the early 1980s. Since that time, the perfusionist has had to decide between continuous versus intermittent sampling, and on-line (an analyzer that can automatically sample either at prescribed intervals and/or on demand) versus in-line devices (monitors that continuously sample and display results). This report compares the continuous, inline CDI-300 blood gas monitor and the Mallinckrodt Gem-Stat blood gas analyzer using intermittent sampling with the Coming 278 blood gas analyzer and 2500 Co-Oximeter. Thirty samples were taken, one per 30 patients, for comparison. Five samples were disqualified from the study. When comparing the remaining 25, the Gem-Stat results to the Coming 278 blood gas analyzer results, all measured values (arterial pH, pCO2, pO2, venous pO2, Na, K and Hct) correlated >0.5000 with a p value of 0.5000 with a p value of 0.5000 with a p value of