The predicted blood volume in a 4-kg term neonate is approximately which value?

The predicted blood volume in a 4-kg term neonate is approximately which value?

• A. 240 mL
• B. 280 mL
• C. 340 mL
• D. 400 mL

Answer: (C)

In neonates, blood volume scales with weight, and the usual value is about 85–90 mL per kilogram. For a term neonate weighing 4 kg, multiply by 4: 4 × 85 ≈ 340 mL (and 4 × 80–90 gives a range of about 320–360 mL). So 340 mL is the best approximate total blood volume. The other numbers are farther from the typical per-kilogram range (240 mL would be about 60 mL/kg and 400 mL about 100 mL/kg), making them less consistent with standard neonatal norms.

In neonates, blood volume scales with weight, and the usual value is about 85–90 mL per kilogram. For a term neonate weighing 4 kg, multiply by 4: 4 × 85 ≈ 340 mL (and 4 × 80–90 gives a range of about 320–360 mL). So 340 mL is the best approximate total blood volume.

The other numbers are farther from the typical per-kilogram range (240 mL would be about 60 mL/kg and 400 mL about 100 mL/kg), making them less consistent with standard neonatal norms.