Final answer:
The Surgical Technologist in a scrub role is responsible for tracking blood loss and surgical instruments used during a procedure, as per the standards published by the Association of Surgical Technologists.
Step-by-step explanation:
The Surgical Technologist (ST) in a scrub role is primarily responsible for maintaining aseptic technique, accurately accounting for surgical instruments, and keeping track of blood loss during a procedure. Among the options provided, the ST must keep track of blood loss as well as B) Surgical instruments used. Keeping an accurate count of surgical instruments, sponges, and needles is critical to ensuring that no items are left inside the patient. This responsibility is outlined by the Association of Surgical Technologists (AST), which publishes standards for aseptic technique, including creating and maintaining a sterile field. While monitoring the patient's vital signs, anesthesia administration, and electrocautery settings are also important, these are typically the responsibility of the anesthesia professional and nursing staff, not the ST in the scrub role.