Normal neonatal HCO3- (bicarbonate) range?

Normal neonatal HCO3- (bicarbonate) range?

• A. 19-24
• B. 22-26
• C. 15-20
• D. 24-28

Answer: (A)

Bicarbonate level reflects the metabolic component of acid–base balance. In healthy newborns, the buffering system and transitional physiology after birth mean the normal neonatal bicarbonate range sits a bit lower than adults. A typical reference for term neonates is roughly 19 to 24 mEq/L. Values within this range usually indicate normal metabolic buffering. If bicarbonate drops below this window, it points toward metabolic acidosis (usually with accompanying acidemia), while values higher than this window suggest metabolic alkalosis or compensatory changes. Always interpret bicarbonate with the accompanying pH and PaCO2 to determine the primary disturbance and the direction of compensation.

Bicarbonate level reflects the metabolic component of acid–base balance. In healthy newborns, the buffering system and transitional physiology after birth mean the normal neonatal bicarbonate range sits a bit lower than adults. A typical reference for term neonates is roughly 19 to 24 mEq/L.

Values within this range usually indicate normal metabolic buffering. If bicarbonate drops below this window, it points toward metabolic acidosis (usually with accompanying acidemia), while values higher than this window suggest metabolic alkalosis or compensatory changes. Always interpret bicarbonate with the accompanying pH and PaCO2 to determine the primary disturbance and the direction of compensation.