Final answer:
The medical assistant should ask the patient to state their name and date of birth and check the identification bracelet to confirm the patient's identity before performing a venipuncture.
Step-by-step explanation:
To confirm the patient's identity before a venipuncture, the medical assistant should ask the patient to state their name and date of birth. This is a critical step in the process, ensuring the right patient receives the procedure. In addition to patient interaction, checking the patient's identification bracelet provides a secondary verification to match the patient with their medical records. Familiarizing all members of the healthcare team with the patient's name, allergies, and procedure is a cornerstone of patient safety and reduces the risk of medical errors.