**Question:** Blood volume in preterm neonate is –

**Core Concept:** Blood volume in neonates, particularly preterm infants, is crucial for understanding their physiological development and addressing potential complications. Blood volume influences oxygen and nutrient delivery, thermoregulation, and overall organ function.

**Why the Correct Answer is Right:** The correct answer, **D**, represents the average blood volume in preterm neonates, which is approximately 75-80 mL/kg of body weight. This value is derived from the normal total blood volume (TBV) in adults, which is around 70 mL/kg, and adjusting for the different body compositions of neonates.

**Why Each Wrong Option is Incorrect:**

A. This option represents a normal adult blood volume, which is not suitable for preterm neonates.
B. This option is too high, reflecting a normal adult blood volume, not appropriate for neonatal physiology.
C. This option is too low, reflecting a newborn blood volume, not suitable for preterm neonates.

**Clinical Pearl / High-Yield Fact:** Understanding neonatal blood volume is essential for managing preterm neonates. Adequate blood volume ensures sufficient oxygen and nutrient delivery, protecting against complications such as hypotension, hypoxia, and impaired organ function. Preterm neonates may require volume expansion therapies, such as albumin or fresh frozen plasma infusions, if their blood volume is significantly below the normal neonatal range.

**Correct Answer:** **D.** Approximately 75-80 mL/kg of body weight. Normal adult blood volume is around 70 mL/kg, but adjusting for neonatal physiology, this value is more appropriate for preterm neonates.