G.P.s are trained to treat the entire family but are not specialists.
Internists attend three or more years in postgraduate training and are expert diagnosticians.
These specialists can treat and coordinate care for children and adults. N.P.s work with people of all ages, providing basic healthcare as well as diagnosing, treating and monitoring chronic diseases, such as diabetes and high blood pressure. N.P.s can prescribe medications and refer patients to specialists. Clinical nurse specialists are trained to diagnose, treat and monitor diseases in their area of expertise. Some clinical nurse specialists may also prescribe medications.