Life span of neonatal RBC is :
**Core Concept**
The life span of red blood cells (RBCs) in neonates is influenced by several factors, including the rate of red cell production, the rate of red cell destruction, and the presence of any underlying hemolytic disorders. Neonatal RBCs are generally smaller and more fragile than adult RBCs.
**Why the Correct Answer is Right**
In neonates, the life span of RBCs is approximately 80-90 days, which is shorter than the adult life span of 120 days. This is due to the higher rate of red cell destruction in neonates, which is partly attributed to the presence of fetal hemoglobin and the higher levels of bilirubin. Additionally, neonates have a higher turnover of RBCs due to the rapid growth and development of the body.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the life span of RBCs in neonates is not 30 days, which is closer to the life span of platelets.
**Option B:** This option is incorrect because the life span of RBCs in neonates is not 60 days, which is closer to the life span of adult RBCs.
**Option C:** This option is incorrect because the life span of RBCs in neonates is not 120 days, which is the life span of adult RBCs.
**Clinical Pearl / High-Yield Fact**
It is essential to note that the life span of RBCs in neonates can vary depending on several factors, including the presence of any underlying hemolytic disorders or conditions that may affect red cell production and destruction.
**Correct Answer: C. 90 days**