As the healthcare profession in the United State is state-regulated, the scope of care can be vary among nurse practitioners depends on their credentials, experiences and education. In some states nurse practitioners can work independently but in other states they can only work collaboratively with physicians or under their supervision. The degree of collaboration is also vary according to the states. In general the scope of practice includes obtain patient histories, conduct physical or psychological examination, provide medical diagnosis, perform and order diagnostic tests, prescribe medication, treat acute and chronic illness, order rehabilitation therapies, offer child care, screen for illness and provide immunization, conduct annual physical
