Clinical Medical Assistant Exam Practice Question

Correct Answer: A

Rationale: A heel stick is preferred for capillary blood collection in newborns or infants due to their small size and delicate skin, which makes finger sticks more challenging and painful.

Option B is incorrect as adults typically undergo finger sticks for blood collection, given their larger and tougher skin.

Option C is misleading; thick fingertips may complicate a finger stick but do not necessitate a heel stick, which is specifically for infants.

Option D is also incorrect; cold hands can affect blood flow but do not dictate the need for a heel stick, as the technique is primarily based on the patient's age.