Final answer:
During a vasovagal episode, the phlebotomist must prioritize patient safety by halting the blood draw, aiding the patient to lie down or sit, monitor their vital signs, reassure them, report to a superior, and document the incident.
Step-by-step explanation:
If a person is having a vasovagal episode, the most important thing the phlebotomist needs to do is ensure the patient's safety by helping them lie down or sit to prevent a fall, monitoring their vital signs, and providing reassurance. The phlebotomist should also stop the blood draw if it's in progress. After the patient has recovered, the phlebotomist should report the episode to a supervisor or healthcare provider and document the incident according to their facility's protocol.