Abstract: ObjectiveArterial blood gas analyser and electrolyte analyser were used to measure arterial blood and venous plasma potassium and sodium ion concentration, the experimental data were statistically compared the differences between them and derived the linear relationship, discussed the clinical significance.Methods Using American production of GEM PREMIER 3000 blood gas analyser and Roche production of ROCHE 9180 electrolyte analyser, detected in 85 cases with arterial blood and venous plasma the potassium and sodium concentration, compared arterial blood and venous plasma potassium, sodium and relevance.Results Arterial blood and venous plasma potassium concentration were significantly different(P<0.05), arterial blood, arterial plasma and venous plasma sodium concentration were not significant differences(P>0.05),arterial plasma and venous plasma potassium or sodium concentration were not significantly different(P>0.05); and arterial blood and venous plasma potassium concentration in a certain linear relationship existed.Conclusionarterial blood potassium concentration is not the same with venous plasma potassium concentration, but according to the experimental data, can roughly calculate the linear regression equation of venous plasma and arterial blood potassium ion concentrationvenous plasma potassium ion(A) =1.445×artery blood potassium ion(V)-1.273(mmol/L), so when the doctor know the potassium concentration in arterial blood,can roughly calculate the potassium concentration in venous plasma, the doctor can comprehensively judge the potassium situation in patient.

Key words: arterial blood, venous plasma, arterial plasma, potassium, sodium