Very low bih weight is less than:-
**Core Concept**
Very low birth weight (VLBW) is a term used to describe infants who are born weighing less than a certain threshold. This concept is crucial in neonatology as it is associated with increased morbidity and mortality.
**Why the Correct Answer is Right**
The correct answer is 1500 grams. This is because infants born weighing less than 1500 grams are at a higher risk of developing complications such as respiratory distress syndrome, hypoglycemia, and intraventricular hemorrhage. The World Health Organization (WHO) defines VLBW as birth weight less than 1500 grams. This definition is based on the fact that infants with a birth weight of less than 1500 grams are more likely to require intensive care and have a higher risk of mortality.
**Why Each Wrong Option is Incorrect**
**Option A:** 1000 grams is incorrect because while infants with a birth weight of less than 1000 grams are considered extremely low birth weight, the term very low birth weight specifically refers to infants born weighing less than 1500 grams.
**Option B:** 2000 grams is incorrect because this is actually the threshold for low birth weight, not very low birth weight.
**Option C:** 2500 grams is incorrect because this is the threshold for normal birth weight, and infants born weighing more than this are not considered to have low or very low birth weight.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the classification of low birth weight is as follows: low birth weight (LBW) is birth weight less than 2500 grams, very low birth weight (VLBW) is birth weight less than 1500 grams, extremely low birth weight (ELBW) is birth weight less than 1000 grams, and extremely extremely low birth weight (EELBW) is birth weight less than 500 grams.
**Correct Answer: D. 1500 grams**