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Bland-Altman plots of potassium and lactate dehydrogenase in serum specimens drawn into 4.0 mL BD Vacutainer® standard serum tube without gel separator and 4.0 mL S-Monovette serum tubes without gel separator used either in “vacuum” or “aspiration” mode. Solid lines are drawn at the mean difference, whereas dashed lines define the 95% Confidence Interval (95% CI).
