In all communications regarding matters relating to the practice of osteopathic medicine, licensees shall clearly state their academic degree and license designation by the use of the term "D.O." or "Doctor of Osteopathy" or "Doctor of Osteopathic Medicine". By way of example, this rule requires use of the stated designation on a licensee's stationery, business cards, advertisements, prescription blanks, signs and public listings and displays.
Okla. Admin. Code § 510:10-3-9