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Correct identification and labeling prevent the most serious preanalytical error—wrong-patient results. Best practice is to label each tube immediately after collection, at the bedside, and in the patient’s presence, verifying two unique identifiers (e.g., full name and MRN or DOB) against the wristband and requisition. Option B reflects this non-negotiable safety step. Pre-labeling (Option A) risks misidentification if the intended specimen is not collected or tubes are mixed. Labeling away from the bedside (Option C) breaks the chain of identification and invites error. Room number (Option D) is not a unique identifier and can change; it must never substitute for approved identifiers. Include date/time, collector ID/initials per policy. For blood bank, additional requirements often apply (e.g., special armbands or separate forms). Mastery of labeling protocols is central on certification exams because it underpins result validity and legal defensibility.