An outpatient arrives for a fasting glucose tolerance test. The phlebotomist confirms the patient's name and date of birth against the requisition. Which of the following is the MOST critical next step in patient preparation?
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A
Ask the patient if they have complied with the fasting requirements.
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B
Explain the procedure and obtain verbal consent.
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C
Check for allergies to latex or adhesives.
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D
Select and prepare the venipuncture site.