Nurse practitioners can diagnose illnesses, order and interpret lab work and imaging, prescribe medications (including controlled substances in most states), and manage ongoing treatment plans. In many settings, an NP functions similarly to a primary care physician, handling everything from routine physicals to chronic disease management. The exact scope depends on state law and the NP’s chosen specialty, but the clinical capabilities are broad.
Core Clinical Duties
NPs are trained to provide a full range of primary, acute, and specialty care. That includes ordering and interpreting diagnostic tests like bloodwork and X-rays, diagnosing conditions, prescribing treatments, and counseling patients on prevention and lifestyle changes. If you visit an NP for a persistent cough, they can examine you, order a chest X-ray, diagnose pneumonia, prescribe an antibiotic, and schedule a follow-up, all without involving a physician.
Chronic disease management is a major part of the role. NPs regularly monitor and adjust treatment plans for conditions like diabetes, high blood pressure, asthma, and thyroid disorders. They also handle acute problems: infections, sprains, minor injuries, and skin conditions. Some NPs perform minor procedures such as suturing lacerations, draining abscesses, removing moles and cysts under local anesthesia, and inserting IUDs, though which procedures a given NP performs depends on their training and practice setting.
Prescribing Authority
NPs can prescribe medications in all 50 states, including Schedule II through V controlled substances in most of them. That means an NP can prescribe common medications like blood pressure drugs, antidepressants, and antibiotics, as well as controlled substances like certain pain medications, stimulants for ADHD, and anti-anxiety drugs. Federal law recognizes NPs as authorized prescribers, but the specific rules vary by state. In some states, prescribing controlled substances requires a collaborative agreement with a physician. In others, NPs prescribe independently.
How Practice Authority Varies by State
Not every NP works under the same rules. States fall into three categories that determine how much independence an NP has:
- Full practice: NPs can evaluate patients, diagnose, order tests, and prescribe medications (including controlled substances) without any required physician oversight. More than 30 states now grant full practice authority.
- Reduced practice: State law requires NPs to maintain a collaborative agreement with another provider, typically a physician, throughout their career in order to practice.
- Restricted practice: NPs must work under direct supervision, delegation, or team management by a physician to provide patient care.
In practical terms, if you see an NP in a full practice state, your entire visit, from diagnosis to prescription, is handled by the NP alone. In restricted states, a physician is formally involved in overseeing that care, even if you never see them in person. NPs are regulated by state nursing boards in most states, with a handful of states giving the medical board some role.
NP Specialties
NPs don’t practice as generalists by default. They train in a specific population focus, which determines who they treat and in what setting.
Family Nurse Practitioner (FNP) is the most common specialty. FNPs provide comprehensive primary care to patients of all ages, from newborns to elderly adults, and their role closely mirrors that of a primary care physician.
Adult-Gerontology NPs focus on adults and older patients. Some work in primary care (routine checkups, chronic disease management), while others specialize in acute care and work in ICUs, emergency departments, or hospital units managing critically ill patients.
Psychiatric Mental Health NPs (PMHNPs) diagnose and treat mental health conditions, substance use disorders, and emotional or behavioral challenges. In states with full practice authority, they independently prescribe psychiatric medications like antidepressants, mood stabilizers, and anti-anxiety drugs.
Neonatal NPs care for infants up to two years old who were born prematurely or with birth defects, infections, or other health conditions. They typically work in neonatal intensive care units.
Other specialties include pediatric NPs and women’s health NPs, each with their own certification and patient population.
Hospital and Specialty Settings
NPs don’t work only in clinics. Many hold hospital privileges that allow them to admit patients, manage inpatient care, and coordinate treatment within a hospital system. Getting those privileges involves a credentialing process where the NP submits documentation of their education, board certification, licenses, and clinical experience to the hospital. The facility’s bylaws determine eligibility. Some NPs work in surgical teams, emergency departments, or specialty practices like cardiology and oncology, functioning as the primary point of contact for patients in those settings.
How NPs Compare to PAs
Nurse practitioners and physician assistants overlap significantly in what they can do day to day, but the training path and regulatory structure differ. NPs must first be registered nurses before entering a master’s or doctoral NP program, where they complete at least 500 supervised clinical hours in their chosen specialty. PAs follow a curriculum modeled on medical school, with roughly 2,000 hours of clinical rotations across multiple disciplines including surgery, pediatrics, and emergency medicine.
The biggest regulatory difference is autonomy. NPs can practice independently in more than 30 states, while PAs nearly always work under some form of physician supervision or collaboration regardless of state. NPs are regulated by nursing boards, PAs by medical boards. In terms of what you experience as a patient, both can diagnose, treat, and prescribe in similar ways. The distinction matters more on the administrative and legal side than in the exam room.
Training and Education
Becoming an NP requires a master’s or doctoral degree in nursing, built on top of an existing registered nursing license. NP programs include at least 500 hours of supervised direct patient care, focused on the student’s chosen population area. After completing the program, NPs must pass a national certification exam in their specialty to practice. Many NPs also bring years of bedside nursing experience before entering their advanced program, which adds practical clinical knowledge beyond formal training hours.