Institutional positions within the ranking are determined by calculating the aggregate D-indexes (Discipline H-index) for all qualifying scholars affiliated with each university, provided that their primary publication output is in Medicine. The D-index is a discipline-specific metric that strictly incorporates publications and citation data relevant to the core area analyzed, thus ensuring an accurate reflection of scholarly impact within Medicine alone.
Scope of Research Considered
The ranking is grounded in the systematic examination of 279,971 scientist profiles identified from a multitude of bibliometric data sources. Of these, a dedicated analysis was conducted for 72,221 scientists specifically active in the field of Medicine. A qualifying threshold for inclusion was set at a D-index of 70 or higher, with the majority of significant publications required to be in the Medicine discipline. Outstanding achievements and awards in Medicine were also considered as important factors.
To robustly identify top-tier researchers, the D-index threshold is calibrated with an incremental step of 10 based on the estimated population of scholars in each discipline, ensuring the inclusion of at least the top 1% of leading scholars per area. Furthermore, inclusion required that the proximity between a scientist’s general H-index and their D-index does not exceed 30%. Consideration of each researcher’s awards and professional achievements further contributed to capturing the most impactful individuals within the Medicine sector.
Verification Practices and Data Integrity
The Research.com ranking team is acutely aware that raw bibliometric data, while valuable, should not be used as the sole criterion for evaluating scholarly output. To address this, all individual scientist profiles were subject to manual verification and cross-checked against publications reported in numerous trustworthy and reputable sources. Although the number of published articles in top-tier journals and conference proceedings is not factored directly into ranking positions, this metric is still regarded as a significant secondary indicator of overall research contributions.
The primary ranking positions are determined by a researcher’s H-index as derived from OpenAlex and CrossRef, the two most authoritative and comprehensive bibliometric databases available to the global research community. For further details regarding the methodology and criteria applied, please consult our methodology page.
Research.com Agenda and Mission
The initiation of the Research.com Medicine Universities Ranking is rooted in our core mission: to motivate scientists, business leaders, and policymakers worldwide to explore emerging trends among top experts, and to provide the broader academic community with a clear, data-driven resource to identify leading contributors in specific disciplines, countries, and institutions. This transparency supports collaborative efforts, fosters excellence, and encourages further innovation in research across the board.
Key Results of the 4th Edition Ranking
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Top 3 Institutions in Brazil by Number of Leading Scientists:
- Universidade de São Paulo – 24 scientists
- Universidade Federal de Minas Gerais – 5 scientists
- Federal University of Rio Grande do Sul – 5 scientists
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Global Leaders in Medicine:
- The most prominent scholars in Medicine globally represent: Harvard University, Harvard Medical School, Washington University in St. Louis, McMaster University, Johns Hopkins University, University of Oxford, University of Bristol, University of Pennsylvania, Yale University, and University of Cambridge.
- Professor Walter C. Willett (Harvard University) is ranked as the top scientist worldwide with a D-index of 411.
- Ranked 2nd globally is Ronald C. Kessler (Harvard University) with a D-index of 332.
- The 3rd position is held by Meir J. Stampfer (Harvard University) with a D-index of 330.
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Statistical Highlights:
- The average total D-index for the top 5% universities is 16,901, compared to an average of 1,798 across all 875 institutions assessed.
- Scientists affiliated with the top 5% of universities have, on average, published 82,045 articles in Medicine, whereas the overall average for all 875 universities is 9,438.
- The average number of citations among researchers at the top 1% universities is 17,279,971, compared to 279,971 for all universities included in the ranking.
This edition of the Research.com Medicine Universities in Brazil Ranking affirms the leading role of Brazilian institutions within the global scientific context and underlines the exceptional achievements of their affiliated scholars, all evaluated through a careful, validated, and transparent process.
