In hyponatremia, what is the recommended correction target in the first 6 hours?

• A. 8-12 mEq/L in the first 24 hours
• B. 2-3 mEq/L in the first 6 hours
• C. 0.5 mEq/L per hour
• D. 4-6 mEq/L in the first 6 hours

Answer: (D)

When correcting hyponatremia, the goal is to raise the serum sodium quickly enough to relieve cerebral edema and symptoms, but not so fast that it damages brain cells. The safe target in the first six hours is a rise of about 4–6 mEq/L. This provides a meaningful improvement in symptoms while keeping within the overall safe correction envelope (about 8–12 mEq/L in the first 24 hours).

Raising by 8–12 mEq/L in 24 hours is a broader guideline, not the specific target for the initial six-hour window. A rate of about 0.5 mEq/L per hour would yield roughly 3 mEq/L in six hours, which is slower than recommended for prompt symptom relief. Conversely, aiming for 2–3 mEq/L in the first six hours undervalues the initial correction needed to reduce cerebral edema.