Comparison of Na, K, Cl, Hb and Hct values measured by blood gas analyzer and laboratory auto-analyzer

OpenAlex · English

Abstract Objective: Measurements of electrolyte levels made by blood gas analyzers or routine methods based on membrane and selective electrodes are expected similar performance characteristics that do not show significant differences. It is clinically important that those measurements should give equivalent results and confirm the closeness to the absolute value. In this study, it was aimed to compare sodium (Na), potassium (K), chlorine (Cl), hemoglobin (Hb) and hematocrit (Hct) values measured with blood gas analyzer and standard automatic devices in the laboratory (lab) from venous blood samples. Methods: A prospective, randomized study was conducted in simultaneous venous samples from antecubital regions of patients admitted to emergency department for various reasons, were analyzed for Na, K, Cl, Hb and Hct values on blood gas analyzer and standard automatic devices in the lab. The obtained data were compared statistically. Results: A total of 100 patients were included in the study. A statistically significant correlation was found between laboratory and venous blood gas (vbg) Na, K, Cl, Hb and Hct values (p<0.001). The average difference between them was -7.9 mEq/L (r=0.720) for Na, 0.5 mEq/L (r=0.785) for K, -5.1mEq/L (r=0.790) for Cl, -0.14 grams/dL (r=0.757) for Hb and -% 1.54 (r=0.749) for Hct, respectively. Their correlation was formulated (Lab Na=vkg Nax0.621+46.081; Lab K=vkg Kx0.23+1.977; Lab Cl=vkg Clx0.847+11.050; Lab Hb=vkg Hbx0.583+5.015; Lab Hct=vkg Hctx0.565+15.024). Conclusion: In our study, it was detected that there is a statistically significant positive correlation between venous blood Na, K, Cl, Hb and Hct values of blood gas analyzer and standard automated devices in lab, and closeness of the desired performance is provided.