## **Core Concept**
Blood volume in neonates, especially preterm, is a critical parameter due to their small body size and the need for precise fluid management. The blood volume in neonates is typically estimated based on body weight. Preterm neonates have a relatively higher blood volume per kilogram of body weight compared to term neonates and adults.

## **Why the Correct Answer is Right**
The correct answer, **90-100 mL/kg**, reflects the estimated blood volume in preterm neonates. This value is higher than that for term neonates (70-80 mL/kg) and adults (approximately 70 mL/kg). The higher blood volume in preterm neonates is due to the need for a larger circulating volume relative to their body size to ensure adequate perfusion of vital organs.

## **Why Each Wrong Option is Incorrect**
- **Option A: 70-80 mL/kg** - This is the estimated blood volume for term neonates, not preterm neonates.
- **Option B: 110-120 mL/kg** - This is higher than the typically cited range for preterm neonates.
- **Option D: 40-50 mL/kg** - This is significantly lower than the estimated blood volume for any neonatal population.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that preterm neonates have a higher risk of anemia and may require more frequent blood transfusions due to their higher blood volume per kilogram and the need for blood draws for laboratory tests. Knowing the blood volume helps in calculating the volume of blood lost during procedures and the amount of blood to be transfused.

## **Correct Answer:** . **90-100 mL/kg**