Extremely low birth weight (ELBW) is called when birth weight is less than _____________
**Core Concept**
Extremely low birth weight (ELBW) is a term used to describe infants born with a birth weight of less than 1000 grams. This concept is crucial in neonatology, as ELBW infants are at a higher risk of complications and require specialized care.
**Why the Correct Answer is Right**
The World Health Organization (WHO) defines ELBW as a birth weight of less than 1000 grams. This definition is used globally to identify infants who require specialized care and have a higher risk of morbidity and mortality. The low birth weight is due to various factors, including premature birth, maternal health issues, and genetic factors.
**Why Each Wrong Option is Incorrect**
**Option A:** 1500 grams - This is actually the threshold for very low birth weight (VLBW), not ELBW.
**Option B:** 500 grams - While this is an extremely low birth weight, it is not the official threshold for ELBW.
**Option C:** 2000 grams - This is a normal birth weight and does not meet the criteria for ELBW.
**Clinical Pearl / High-Yield Fact**
Remember that ELBW infants require close monitoring and specialized care, including neonatal intensive care unit (NICU) admission, to prevent complications and promote optimal growth and development.
**Correct Answer:** 1000 grams.