Final answer:
The blood specimen tube should be labeled immediately after the blood draw, including key patient information to ensure safety and accuracy.
Step-by-step explanation:
A medical assistant should label the blood specimen tube immediately after drawing the blood and before collecting any other patient's specimen. Proper labeling is crucial for specimen identification to prevent medical errors. It is a part of ensuring the safety and accuracy of the procedure. During labeling, the medical assistant must include details such as the patient's name, identification number, date, and time of collection, as well as the type of test to be performed. This process prevents any mix-up of specimens which could result in diagnostic errors, treatment complications, or the need for another phlebotomy procedure.