The blood volume of a 10-kg, 1-year-old infant is approximately:

The blood volume of a 10-kg, 1-year-old infant is approximately:

• A. 600 mL
• B. 800 mL
• C. 1000 mL
• D. 1300 mL

Answer: (B)

Estimating blood volume in a child is based on weight, because blood volume scales with body size. In infants and young children, a typical value is about 80 mL per kilogram. For a 10 kg, 1-year-old child, multiplying 10 kg by 80 mL/kg gives roughly 800 mL. This helps clinicians gauge how much blood could be lost before perfusion is seriously affected and guides fluid or blood product replacement during anesthesia. The other numbers fall outside the usual pediatric range: 600 mL would be about 60 mL/kg (lower than standard for this age), while 1000 mL or 1300 mL would correspond to 100–130 mL/kg (higher than expected for an infant).

Estimating blood volume in a child is based on weight, because blood volume scales with body size. In infants and young children, a typical value is about 80 mL per kilogram. For a 10 kg, 1-year-old child, multiplying 10 kg by 80 mL/kg gives roughly 800 mL. This helps clinicians gauge how much blood could be lost before perfusion is seriously affected and guides fluid or blood product replacement during anesthesia. The other numbers fall outside the usual pediatric range: 600 mL would be about 60 mL/kg (lower than standard for this age), while 1000 mL or 1300 mL would correspond to 100–130 mL/kg (higher than expected for an infant).