DNP = Doctor of Nursing Practice
NP = Nurse Practitioner (Can be a DPN, but can also be a MS level nurse in some specialties and some locales)
APRN = Advanced Practice Registered Nurse (Any registered nurse with a master or doctoral degree. Can be a DNP, CNW, CRNA, CNS, etc)
CNS = Clinical Nurse Specialist (CNS are often referred to as NPs when they practice within a specialty for which they’ve received advanced training, such as psychiatric NP or pediatric NP.)
CNW = Certified Nurse Midwife
CRNA = Certified Registered Nurse Anesthestist
BSRN = Bachelor of Science in Registered Nursing
RN = Registered Nurse (requires a 2 or 3 year associate’s degree plus passing a national licensing exam, NCLEX-RN)
LVN/LPN = Licensed Vocational Nurse/Licensed Practical Nurse (does not require an Associate’s degree, but does require a typically 12 month long training program, plus passing a national licensing exam, NCLEX-PN)
CNA = Certified Nursing Assistant (requires a 6-8 week certification class + passing a standardized state competency exam)
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PA = Physician Assistant (Requires a BS degree plus a MS in Physician Assisting, plus passing a standardized national licensing exam.)
CAA = Certified Anesthesiologist Assistant (Requires a BS plus MS in Anesthesiology, plus passing a national standardized licensing exam.)
MA = Medical Assistant (High school diploma or GED. Some states require a 1-2 week long training class plus passing a state certification test.)
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APRN/DNP has a scope of practice more or less equivalent to PA
CRNA has a scope of practice more or less equivalent to a CAA
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REALLY LATE EDIT
And to make even more confusing, Missouri will now license APs
AP = Assistant Physician
An AP is US citizen graduate from an overseas medical school who, for whatever reason, was unable to obtain a US medical residency. They are basically equivalent to a PA or NP in scope of practice. They work solely in primary care and under the supervision of a fully licensed attending physician.
Arkansas will license GRPs
GRP = Graduate Registered Physician
A GRP is the same thing as an AP above. A US citizen who graduated from a foreign medical school who has NOT completed a US medical residency and whose scope of practice is limited to primary care under the supervision of a fully licensed attending physician. Equivalent to a NP or PA.
Although GRPs and APs hold medical degrees (MD or MBBS), they may NOT call themselves “Doctor”.