Registered nurses (RNs) and licensed practical nurses (LPNs) can perform many of the same hands-on tasks, but they differ significantly in what they’re allowed to do with the information they gather. The core distinction isn’t about who can take a blood pressure or listen to lung sounds. It’s about who can interpret findings, create care plans, and make independent clinical decisions based on those findings.
The Real Difference: Judgment, Not Tasks
A common misconception is that RNs and LPNs are separated by a list of specific procedures one can do and the other can’t. The reality is more nuanced. As the Maryland Board of Nursing explains, all levels of nursing licensure can perform the same assessment activities, like a neurological exam. The difference lies in what each nurse is authorized to do next: how they interpret the results, what interventions they can select, and what level of nursing diagnosis and care planning they can develop.
An LPN can collect vital signs, observe symptoms, and document what they see. An RN takes that same data and synthesizes it into a clinical picture, decides what it means, builds or adjusts a care plan, and determines whether the patient’s condition is improving or deteriorating. This interpretive authority is the single biggest gap between the two roles.
IV Therapy and Medication Administration
IV-related tasks are one of the most concrete areas where RN and LPN scopes diverge, though the specifics vary by state. In Texas, for example, LPNs (called LVNs there) cannot perform any IV therapy, including venipuncture, IV fluid administration, or IV push medications, unless they’ve completed a specialized validation course. Even after that training, their ability to administer specific IV drugs or titrate IV drip medications depends on facility policy.
Central line care is more restricted. Inserting or removing PICC lines or midline catheters is considered beyond the LPN scope of practice in Texas entirely, regardless of additional training. Maintaining central lines and performing dressing changes also falls outside standard LPN education, meaning LPNs need additional coursework before a facility can allow them to handle those tasks.
Blood product transfusions are another area where many states restrict LPN involvement, though policies vary. In general, the pattern holds: the higher the risk of the intervention, the more likely it requires an RN.
Unstable and Complex Patients
Patient assignment rules reflect the judgment gap between the two roles. In practice, healthcare facilities typically assign only stable patients to LPNs. One hospital system profiled in American Nurse Today used a complexity scoring system and reserved patients scoring above 4 for RNs only. Patients whose conditions are unpredictable, rapidly changing, or require frequent reassessment and decision-making need an RN at the bedside.
This means LPNs are less likely to work in intensive care units, emergency departments, or labor and delivery settings where patient status can shift quickly. They’re more commonly found in long-term care, rehabilitation facilities, physician offices, and medical-surgical floors where patient conditions tend to be more predictable.
Triage and Clinical Decision-Making
Triage is a good example of how the RN-LPN boundary works in practice. Washington State’s Board of Nursing allows LPNs to triage phone calls if they’ve received specialized training and are working under the direction of an RN or other authorized provider. But the moment a situation becomes complex, like a caller expressing suicidal thoughts or a patient whose symptoms don’t fit a straightforward protocol, the LPN is expected to refer the case to an RN.
Standing orders can extend what an LPN handles day to day, but those orders should include clear thresholds for when a call or situation crosses into territory requiring RN involvement. The LPN can collect information and follow protocols. The RN makes the judgment calls when those protocols run out.
Supervision and Delegation
RNs hold supervisory authority over LPNs in most clinical settings. An RN can delegate tasks to LPNs and to unlicensed assistive personnel like CNAs, and is professionally responsible for ensuring those delegated tasks are appropriate for the person performing them. LPNs generally cannot delegate nursing tasks in the same way, though the specifics depend on state law.
The National Council of State Boards of Nursing emphasizes that delegation rules vary significantly by jurisdiction. What an LPN can do in one state may be off-limits in another, so both RNs and LPNs are responsible for knowing the rules wherever they practice. This is one reason the question “what can an RN do that an LPN can’t” doesn’t have a single universal answer. The broad strokes are consistent, but the details shift at state lines.
Care Planning and Nursing Diagnosis
Developing an initial care plan is an RN responsibility. LPNs contribute to care plans by reporting observations and carrying out the interventions an RN has outlined, but the act of formulating a nursing diagnosis and designing the plan of care requires RN-level education and licensure. Similarly, patient education that involves interpreting complex medical information or teaching a patient to manage a new chronic condition typically falls to the RN, while an LPN might reinforce teaching points the RN has already established.
Education, Earnings, and Career Path
The scope-of-practice differences reflect a gap in required education. LPN programs typically take about one year and result in a diploma or certificate. RN pathways require either an associate degree (two years) or a bachelor’s degree (four years), with significantly more coursework in pharmacology, pathophysiology, and clinical decision-making.
That additional training translates directly into pay. According to Bureau of Labor Statistics data, RNs earn a median salary of $98,430 per year, compared to a mean of $64,150 for LPNs. The difference of roughly $34,000 annually reflects both the broader scope of practice and the greater clinical responsibility RNs carry. Many LPNs use their experience as a stepping stone, enrolling in LPN-to-RN bridge programs to expand their scope and earning potential without starting from scratch.