Final answer:
Palpating the venipuncture site allows healthcare workers to determine vein size and depth, move arteries out of the way, and distract the patient before the procedure.
Step-by-step explanation:
When palpating the venipuncture site, healthcare workers are able to determine the size and depth of the vein, which is important for successful venipuncture. Palpation also helps to move arteries out of the way to avoid puncturing them during the procedure. Additionally, palpating the venipuncture site gives the healthcare worker an opportunity to distract the patient and reduce any discomfort or anxiety before the venipuncture.