Use of rapid ABG analyzer in measurement of potassium concentration: Does it agree with venous potassium concentration?

Abstract

Background: Because extreme venous potassium abnormality can be life threatening, rapid measurement of potassium level is essential. Traditional biochemical analysis for venous potassium takes time and delays management in seriously ill patients. Analysis form arterial blood gas (ABG) may be an alternative method that is faster. Objective: To determine agreement between potassium obtained from venous and arterial blood gas in emergency patients, Siriraj Hospital. Material and Method: Cross-sectional study performed in 53 patients who presented to the emergency department of Siriraj Hospital. Potassium level measured from ABG was compared to venous route. Results: The mean of venous, arterial potassium and difference between each pair were 3.95, 3.46, and 0.49 mmol/L respectively. The Intraclass Correlation Coefficient between each pair of two methods and 95% CI of agreement were 0.904 and 0.839 to 0.943, p < 0.01. Conclusion: The agreement between ABG and venous potassium measurement are confirmed. Clinicians can use ABG's potassium level as a guideline for treatment instead of using the conventional venous potassium level.