Normal neonatal sodium range?

Normal neonatal sodium range?

• A. 140-150
• B. 120-135
• C. 133-149
• D. 140-160

Answer: (C)

Normal sodium in a term neonate is about 133 to 149 mEq/L. This range reflects the still-maturing kidneys and the fluid shifts that occur after birth, with sodium helping to keep extracellular fluid and osmolality in balance. Values within 133–149 indicate what is expected for healthy newborns; when sodium drops below 133, hyponatremia can occur from excess free water or losses, and when it rises above 149, hypernatremia can result from dehydration or high-sodium fluids. Among the given options, 133–149 best matches the typical neonatal range. The other ranges either start too high or too low or extend beyond the usual neonatal limits, making them less appropriate representations of normal neonatal sodium.

Normal sodium in a term neonate is about 133 to 149 mEq/L. This range reflects the still-maturing kidneys and the fluid shifts that occur after birth, with sodium helping to keep extracellular fluid and osmolality in balance. Values within 133–149 indicate what is expected for healthy newborns; when sodium drops below 133, hyponatremia can occur from excess free water or losses, and when it rises above 149, hypernatremia can result from dehydration or high-sodium fluids. Among the given options, 133–149 best matches the typical neonatal range. The other ranges either start too high or too low or extend beyond the usual neonatal limits, making them less appropriate representations of normal neonatal sodium.