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A higher proportion of hospital care delivered by specialty-certified registered nurses was associated with better patient outcomes, including lower odds of in-hospital death and several nursing-sensitive complications, according to new research.
The study, published in Nursing Outlook, linked 42,078 hospitalized patients with 2,683 nurses who participated in their care across four hospitals, allowing researchers to examine the relationship between specialty certification and outcomes at the individual patient level rather than relying on hospital- or unit-wide certification rates.
Greater Exposure to Certified RNs Linked to Better Outcomes
For every 10% increase in care provided by specialty-certified RNs, researchers found:
- 5% lower odds of in-hospital mortality
- 13% lower odds of pressure injury
- 15% lower odds of urinary catheter-associated bacteriuria
- 18% lower odds of central line-associated bloodstream bacteremia
The researchers found no significant adjusted association between specialty-certified RN care and 30-day readmission or hospital length of stay.
On average, 27% of each patient’s nursing care was delivered by specialty-certified RNs. About 66% of care was provided by nurses with a BSN or higher, while contract nurses delivered 19% of care.
Certification Findings Held Independent of Education Level
One notable finding was that the association between specialty certification and patient outcomes was independent of nurses’ level of formal education.
Greater exposure to BSN- or higher-prepared nurses was associated with shorter hospital stays, but not with the other outcomes examined, after adjustment. Researchers also found no significant interaction between specialty-certified RN care and BSN-prepared RN care.
The findings do not suggest that specialty certification and academic nursing education are interchangeable. The researchers noted that the two may contribute to patient care through different but complementary pathways.
Linking Patients Directly to the Nurses Who Cared for Them
Previous research has largely examined certification rates across entire hospitals or nursing units, making it difficult to determine how much care individual patients actually received from specialty-certified nurses.
In this study, researchers used time-stamped electronic health record activity to link individual patients with the nurses involved in their care. They then calculated the proportion of each patient’s care delivered by specialty-certified RNs.
The retrospective observational study included adults hospitalized for at least 24 hours between January 2020 and December 2021 at four hospitals in a South Carolina health system.
Researchers adjusted for numerous factors that could influence outcomes, including patient age, illness severity, mortality risk, previous hospitalization, comorbidities, COVID-19 status, nurse experience, contract-nurse care, and nursing education.
Why Specialty Certification May Matter
Specialty RN certification is a voluntary credential that validates expertise within a particular area of nursing practice. Nurses seeking certification must meet specialty-specific eligibility requirements, typically including clinical experience and specialty-focused preparation, and pass a standardized examination. Maintaining certification requires periodic renewal through continuing education or reexamination.
The researchers suggested that advanced knowledge, specialty-specific competencies, evidence-based practice, and clinical judgment could help explain the association with better patient outcomes.
Certification may also reflect characteristics the study did not fully capture. Nurses who pursue certification may be more committed to professional development or patient care, while hospital work environments and staffing could influence both certification and outcomes.
Because the study was observational, it cannot establish that specialty certification caused the better outcomes.
What the Findings Could Mean for Hospitals
The findings suggest that supporting specialty certification could be a workforce strategy for healthcare organizations seeking to strengthen patient safety and quality.
The researchers recommend supporting and incentivizing specialty certification and retaining specialty-certified RNs. They also point to financial and organizational support, clinical advancement pathways, mentorship, recognition, and professional development as ways health systems can encourage certification.
An Important Distinction in the Infection Findings
The study did not measure formally diagnosed catheter-associated urinary tract infections, or CAUTIs, or central line-associated bloodstream infections, or CLABSIs. Instead, researchers measured urinary catheter-associated bacteriuria and central line-associated bloodstream bacteremia using microbiological findings recorded in the EHR.
The authors said these measures may provide more objective indicators of device-associated infectious risk and more directly reflect nursing-sensitive catheter and central line maintenance practices.
This distinction matters when interpreting the findings. The results should not be described as a 15% reduction in CAUTIs or an 18% reduction in CLABSIs.
Study Limitations
All four hospitals were part of a single South Carolina health system, which may limit how broadly the findings apply to other hospitals and healthcare settings. The study period also covered 2020 and 2021, when the COVID-19 pandemic affected patient acuity and the nursing workforce.
Researchers used EHR activity as a proxy for direct patient care. Although previous research has shown this method to be highly accurate in identifying clinicians involved in patient care, it cannot capture all nursing activities or the time a nurse spends with a patient.
The researchers also analyzed specialty certification as a single category, preventing them from determining whether specific certifications were associated with different outcomes.
Because this was an observational study, the research cannot rule out unmeasured factors that may have contributed to the findings.
What This Means for Nurses
Specialty certification has long offered nurses a way to demonstrate advanced knowledge and expertise in clinical practice. This study adds patient-level evidence that the credential may have implications beyond professional development.
The research cannot establish that certification itself caused better outcomes. But by linking individual patients with the nurses involved in their care, the findings strengthen the evidence supporting specialty certification as a potential investment in nursing expertise, patient safety, and quality of care.
