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The nurse is assessing a patient after returning from surgery. After reviewing the patient's lab results, the nurse should notify the physician of:

Explanation

•Sodium 135-145 mEq/L
•Potassium 3.5-5.0 mEq/L
•Magnesium 1.3-2.1 mEq/L
•Phosphorus 3-4.5 mg/dL

•The patient's potassium level is low. Even a small decline in potassium can cause serious cardiac events.

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