Newborns have a blood volume of which range?

• A. 80 to 110 mL
• B. 60 to 90 mL
• C. 120 to 150 mL
• D. 40 to 70 mL

Answer: (A)

Newborn blood volume is best understood per kilogram of body weight. The commonly cited range is about 80 to 110 mL of blood per kilogram. This means a baby weighing around 3 kg would have roughly 240 to 330 mL of circulating blood in total. The other ranges fall outside this neonatal per‑kg estimate, so they’re not used to describe newborn blood volume. Knowing this per‑kg value helps clinicians estimate blood loss and plan transfusions, since the total circulating volume in newborns is relatively small compared to adults.