Before drawing, what is essential to prevent labeling errors?

• A. The color of the tube.
• B. Proper patient identification.
• C. The lab's phone number.
• D. The time of day.

Answer: (B)

Verifying the patient’s identity using two identifiers before drawing is essential to prevent labeling errors. By confirming who the patient is with two independent identifiers—such as the full name and date of birth or matching the armband ID with the requisition—you ensure the specimen will be attributed to the correct person and the right tests. This step anchors the labeling process in accuracy and helps avoid dangerous mix-ups that can happen if patient information isn’t verified. The color of the tube, the lab’s phone number, or the time of day do not provide identity verification and won’t prevent mislabeling.