A 30-year-old man weighing 70 kg had a sodium level of 120 mEq/L. Calculate the sodium deficit.

Options

1. 280 mEq
2. 480 mEq
3. 840 mEq
4. 1400 mEq

Correct Answer

840 mEq

Explanation

Sodium deficit = TBW × (Normal Na - Current Na). Total Body Water (TBW) = 0.6 × body weight = 0.6 × 70 = 42L. Normal sodium = 140 mEq/L, Current = 120 mEq/L. Deficit = 42 × (140-120) = 42 × 20 = 840 mEq.

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