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RESULTS Based on the statistical analysis using SPSS 17, the F values for the homogeneity tests of each level of the frozen mixed serum potassium RMs were 0.247, 0.117, and 0.162. These values were less than F0.05 (9, 2 = 2.39. When the short-term stability of the serum potassium was observed for 30, 12, and 4 days at 2 - 8°C, room temperature, and 37°C, respectively, |b1| less then t0.95, n - 2·sb1, and instability was not observed. CONCLUSIONS The three levels of the frozen mixed serum potassium RMs have good uniformity. At 2 - 8°C,