A physician orders digoxin (Lanoxin) for a client with heart failure. During digoxin therapy, which laboratory value may predispose the client to digoxin toxicity?
a) Sodium level of 152 mEq/L
b) Magnesium level of 2.5 mg/dl
c) Potassium level of 2.8 mEq/L
d) Calcium level of 7.5 mg/dl
Answer: Potassium level of 2.8 mEq/L
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