Which of the following represents an abnormal electrolyte serum level?
A) Sodium, 140 mEq/L
B) Potassium, 6 mEq/L
C) Calcium, 9.5 mEq/L
D) Magnesium, 1.7 mEq/L
Answer: B) Potassium, 6 mEq/L
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