The nurse is caring for a client who is taking digoxin and is complaining of nausea. The nurse gathers additional assessment data and checks the most recent laboratory results. Which laboratory value requires the need for follow-up by the nurse?
1
Sodium 138 mEq/L (138 mmol/L)
2
Potassium 3.3 mEq/L (3.3 mmol/L)
3
Phosphorus 3.1 mg/dL (1.0 mmol/L)
4
Magnesium 1.8 mg/dL (0.9 mmol/L)