Does the administration of preoperative antibiotics by a CRNA require a written order or can the antibiotic be administered routinely without a written order?

Pursuant to an order for anesthesia or anesthesia-related services, it is within the scope of practice for a CRNA to order and administer antibiotics consistent with the needs of the patient, the type of case, and preferences of the surgeon or other physician caring for the patient.  Antibiotics, like any other dangerous drug, require a knowledgeable professional to determine the need and appropriateness for the drug.  It is common for a surgeon or other physician to discuss with the CRNA the preferred antibiotic for a particular case or patient.  Pursuant to that discussion, it is common for the CRNA to order and administer the antibiotic.