Headline
The study "Variations in general practitioners' referrals to low-value MRI examinations in Norway: A nationwide register-based study" investigates disparities in how general practitioners (GPs) in Norway refer patients for magnetic resonance imaging (MRI) of the head, lumbosacral spine, and knee—examinations classified as potentially low-value in certain clinical contexts. Published in *The European Journal of General Practice* (2026), the research analyzes national registry data to assess patterns of referral rates and their association with GP characteristics, practice settings, and patient factors.
Study Overview
The study employed a nationwide register-based design, linking patients’ MRI examination records to their assigned general practitioners (GPs) using Norwegian national databases. Researchers calculated GP-specific MRI referral rates per 1,000 listed patients and categorized GPs into deciles based on their referral intensity. The highest referral decile (High-10) was compared with the lowest (Low-10) to identify differences in referral patterns. The analysis included data from multiple years, with statistical models accounting for year fixed effects and GP-clustered standard errors. The study focused on MRI examinations of the head, lumbosacral spine, and knee, which have been previously flagged as potentially low-value due to limited evidence of clinical benefit in specific scenarios. The research aimed to determine whether variations in referral rates correlated with GP experience, practice characteristics, or patient demographics.
Key Findings
The study found significant variation in MRI referral rates among GPs, with those in the highest decile (High-10) referring patients for potentially low-value MRI examinations at three times the rate of those in the lowest decile (Low-10). Specialist-certified GPs referred approximately 2.7 fewer MRI examinations per 1,000 patients annually compared to non-specialist GPs. Factors associated with higher referral rates included shorter consultation times, higher consultation frequency, and greater hourly fee income, with the strongest link observed for private MRI examinations. Conversely, higher patient disease burden was linked to increased total MRI use but fewer private referrals. Male GPs and fee-for-service/capitation GPs also exhibited higher referral rates. The findings suggest that clinical decision-making, practice structure, and financial incentives may influence the likelihood of referring patients for MRI scans, particularly in private settings.
Limitations
The study’s observational design limits causal inferences, as it cannot establish direct relationships between GP characteristics and referral behavior. While the analysis adjusted for year fixed effects and GP clustering, unmeasured confounding factors—such as regional healthcare policies, patient preferences, or local clinical guidelines—may influence results. Additionally, the focus on Norway’s healthcare system, which emphasizes primary care gatekeeping, may reduce the generalizability of findings to other countries with different referral structures. The study also did not assess the clinical appropriateness of individual referrals, relying instead on predefined classifications of low-value care. These limitations highlight the need for further research to explore the underlying drivers of variation in MRI referral rates and their impact on patient outcomes.
Contextual Relevance
The findings highlight the complexity of diagnostic imaging decisions in primary care, particularly for spine-related MRIs, which are frequently requested for conditions such as low back pain or cervical spine disorders. While the study does not directly address chiropractic care, its insights into GP referral patterns may inform discussions about interdisciplinary collaboration and the role of primary care in managing musculoskeletal conditions. Chiropractors often encounter patients referred for imaging, and understanding the factors influencing these referrals could help optimize care coordination. The study also underscores the importance of evidence-based decision-making in reducing low-value care, a principle aligned with chiropractic values of patient-centered, cost-effective treatment. However, the research does not evaluate the clinical outcomes of MRI use or its impact on patient recovery, leaving room for further investigation into the balance between diagnostic certainty and unnecessary testing.