What is the primary source of verification a nurse should use when administering a unit of red blood cells?

The primary source of verification a nurse should use when administering a unit of red blood cells is the identification wristband. This is crucial because ensuring the correct patient receives the blood transfusion is of utmost importance in preventing serious complications, such as hemolytic reactions, which can occur if the wrong blood type is given to a patient.

Verification using the identification wristband involves checking the patient's name, medical record number, and date of birth against the blood product label and the transfusion order. This step ensures that the blood being administered matches the patient’s blood type and identity.

While the chart, order sheet, and medication administration record contain valuable information about the ordered blood product and patient history, they do not provide real-time verification of the patient’s identity at the moment of transfusion. Therefore, relying on the identification wristband is essential to uphold safety standards and avoid errors during the transfusion process.