WAC 246-840-310
WAC 246-840-310. Use and protection of professional titles
A person who holds a license to practice as an ARNP shall have the right to use the title "advanced registered nurse practitioner" and the abbreviation following the nurse's name shall read "ARNP" or "NP."
An ARNP may also use the applicable title or abbreviation, or designation as defined in WAC 246-840-302 .
No other person shall assume such titles or use such abbreviations.