Table 4. Coefficient of precision, determination, concordance and accuracy between assays (POC and Lab).

	Precision	Determination	Concordance	Accuracy
	r	r2	κ	Cb
Na+, mmol/L	0.9359	0.8759	0.9013	0.9630
K+, mmol/L	0.9443	0.8917	0.8888	0.9412
Cl-, mmol/L	0.9669	0.9348	0.9553	0.988
HCO3-, mmol/L	0.9678	0.9366	0.9578	0.9896
Glu, mg/dL	0.9716	0.944	0.9399	0.9673
Hb, g/dL	0.9851	0.9704	0.8728	0.8861
Hct, %	0.9814	0.9631	0.9561	0.9743

POC is Point-of-Care Siemens RAPIDPoint 500 blood gas system, Lab is central Laboratory analyzers, Na⁺ is sodium (n = 314), K⁺ is potassium (n = 314), Cl^- is chloride (n = 313), HCO₃^- is bicarbonate (n = 313), Glu is glucose (n = 306), Hb is hemoglobin (n = 312) and Hct is hematocrit (n = 312).