Vitamin K injection given to newborn within 1 hour of birth
**Core Concept**
Vitamin K injection is administered to newborns to prevent vitamin K deficiency bleeding (VKDB), a condition that occurs when the baby lacks sufficient vitamin K to produce clotting factors in the liver. This is a critical intervention in the first hour of life to prevent severe bleeding complications.
**Why the Correct Answer is Right**
Vitamin K is essential for the post-translational modification of clotting factors II, VII, IX, and X in the liver, as well as proteins C and S. Without adequate vitamin K, these clotting factors are not produced properly, leading to an increased risk of bleeding. In newborns, the gut is sterile, and the bacteria that normally produce vitamin K are absent, making it necessary to administer vitamin K prophylactically.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because vitamin K injection is not typically given at birth for pain management. While newborns may experience pain during delivery, vitamin K is specifically used to prevent VKDB.
**Option B:** This option is incorrect because vitamin K injection is not a treatment for neonatal hypoglycemia. Although newborns may experience hypoglycemia in the first few hours of life, vitamin K is not administered for this purpose.
**Option C:** This option is incorrect because vitamin K injection is not a routine part of newborn screening. While newborn screening may include tests for conditions such as phenylketonuria and congenital hypothyroidism, vitamin K is administered separately to prevent VKDB.
**Clinical Pearl / High-Yield Fact**
The American Academy of Pediatrics recommends administering vitamin K injection to all newborns within the first hour of life to prevent VKDB. This is a critical preventive measure that can significantly reduce the risk of severe bleeding complications in newborns.
**Correct Answer:** D. Vitamin K injection is given to prevent VKDB.