serum calcium level > 10.5 mg/dL
serum calcium level < 8.5 mg/dL
serum potassium level >5.0 mEq/L
serum potassium level <3.5 mEq/L
serum magnesium level > 2.7 mg/dL
serum magnesium level <1.7 mg/dL
serum sodium level > 145 mEq/L
serum sodium level <135 mEq/L