Final answer:
The PCT should apply pressure to the puncture site after collecting the specimen.
Step-by-step explanation:
When performing a heel stick on an infant, the PCT should choose option D) Apply pressure to the puncture site after collecting the specimen.
This is done to help stop bleeding and promote clotting. Applying pressure for a few minutes can help minimize the risk of bruising or further bleeding.
Options A, B, and C are incorrect. The heel stick should be performed on the center of the heel, not the outer edge. Warming the infant's heel is not necessary for this procedure. The lancet should always be single-use and disposed of properly to prevent infection.