Hyponatremia is marked by a serum sodium level less than
1. 137 mEq/mL.
2. 140 mEq/mL.
3. 135 mEq/mL.
4. 145 mEq/mL.
Correct Answer: 3
Rationale 1: 137 is normal.
Rationale 2: 140 is normal.
Rationale 3: 135 indicates a hyponatremia state.
Rationale 4: Normal serum sodium range is 135–145 mEq/L.
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