Final answer:
When a hematoma develops at the site of venipuncture, the phlebotomist should take appropriate action to address the issue.
Step-by-step explanation:
When a phlebotomist notices a hematoma developing at the site of venipuncture, they should take appropriate action to address the issue. A hematoma is a collection of blood outside the blood vessel, and it occurs when there is damage to the blood vessel during the venipuncture procedure. The phlebotomist should apply pressure to the site to stop the bleeding and prevent further blood from leaking into the tissue. They should also notify the healthcare provider or supervisor about the hematoma.