Question 1 · Easy
Into which site is intramuscular vitamin K given to a term newborn?
- AVastus lateralis of the thigh
- BDeltoid of the upper arm
- CRectus femoris on the front of the thigh
- DDorsogluteal muscle of the buttock
Show answerHide answer
Answer: A · Vastus lateralis of the thigh
The vastus lateralis, on the anterolateral thigh, is the best-developed muscle in a newborn and is away from major nerves and vessels. Vitamin K is given there soon after birth, usually 1 mg for a term baby, to prevent vitamin K deficiency bleeding. The same site is used for the birth dose of hepatitis B vaccine, in the other thigh if both are given together. A 5/8-inch (16 mm) needle is usual.
- B: The newborn deltoid is too small for an intramuscular injection.
- C: The rectus femoris lies near the femoral vessels and nerve and is not the preferred newborn site.
- D: The dorsogluteal site risks the sciatic nerve and the muscle is undeveloped until walking.