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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 97 9078 8521 20 20 611 55892

Colm O'Morain publications per year

The chart shows the history of publications by Colm O'Morain between 1978 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Colm O'Morain published across 48 years, from 1978 to 2025, averaging 13.1 papers a year. Output peaked at 29 publications in 2003. 10 of the 628 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1978 to 2025. Vertical axis: number of publications, 0 to 29. Peak 29 publications in 2003. 1978: 1 publication 1979: 1 publication 1980: 1 publication 1981: 1 publication 1982: 2 publications 1983: 5 publications 1984: 4 publications 1985: 2 publications 1986: 3 publications 1987: 3 publications 1988: 11 publications 1989: 6 publications 1990: 9 publications 1991: 8 publications 1992: 7 publications 1993: 20 publications 1994: 15 publications 1995: 17 publications 1996: 14 publications 1997: 19 publications 1998: 20 publications 1999: 13 publications 2000: 27 publications 2001: 15 publications 2002: 13 publications 2003: 29 publications 2004: 18 publications 2005: 21 publications 2006: 29 publications 2007: 24 publications 2008: 19 publications 2009: 19 publications 2010: 25 publications 2011: 21 publications 2012: 17 publications 2013: 14 publications 2014: 17 publications 2015: 12 publications 2016: 18 publications 2017: 12 publications 2018: 9 publications 2019: 12 publications 2020: 12 publications 2021: 24 publications 2022: 9 publications 2023: 20 publications 2024: 5 publications 2025: 5 publications
1978 2025

628 publications in total across all disciplines

View publications per year as a table
Colm O'Morain: publications per year, 1978 to 2025
Year Publications
1978 1
1979 1
1980 1
1981 1
1982 2
1983 5
1984 4
1985 2
1986 3
1987 3
1988 11
1989 6
1990 9
1991 8
1992 7
1993 20
1994 15
1995 17
1996 14
1997 19
1998 20
1999 13
2000 27
2001 15
2002 13
2003 29
2004 18
2005 21
2006 29
2007 24
2008 19
2009 19
2010 25
2011 21
2012 17
2013 14
2014 17
2015 12
2016 18
2017 12
2018 9
2019 12
2020 12
2021 24
2022 9
2023 20
2024 5
2025 5
Total 628
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Colm O'Morain publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Colm O'Morain sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 601–620 publications, is where this scientist sits. 101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 610 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101–120 publications 1,796+

This scientist: 611 publications — 73rd percentile

73% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537
561–580 504
581–600 509
601–620 396 611
621–640 386
641–660 371
661–680 340
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204
821–840 186
841–860 177
861–880 155
881–900 139
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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Colm O'Morain D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Colm O'Morain sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 96–97 D-Index, is where this scientist sits. 70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 399 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70–71 D-Index 217+

This scientist: 97 D-Index — 55th percentile

55% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391
74–75 574
76–77 730
78–79 891
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970
90–91 922
92–93 839
94–95 808
96–97 779 97
98–99 668
100–101 611
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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Research.com Recognitions

  • 2011 - Member of the Royal Irish Academy

Overview

Colm O'Morain is affiliated with Trinity College Dublin in Ireland and has contributed extensively to the field of medicine, with a focus on gastroenterology and related disciplines. Their research portfolio includes over 100 publications, primarily within the field of medicine, with notable subfields in surgery, gastroenterology, pulmonary and respiratory medicine, genetics, and epidemiology.

Their work notably addresses several key topics within gastroenterology and digestive diseases, including:

  • Helicobacter pylori-related gastroenterology studies
  • Gastroesophageal reflux and treatments
  • Gastric cancer management and outcomes
  • Inflammatory bowel disease
  • Eosinophilic esophagitis
  • Microscopic colitis
  • Veterinary medicine and infectious diseases

Colm O'Morain has published papers in a variety of reputable journals, with frequent contributions to:

  • Gastroenterología y Hepatología
  • Gastroenterology
  • United European Gastroenterology Journal
  • Antibiotics
  • Gut

Their notable recent papers include:

  • Management of Helicobacter pylori infection: the Maastricht VI/Florence consensus report (2022) in Gut
  • Management of Patients With Crohn's Disease and Ulcerative Colitis During the Coronavirus Disease-2019 Pandemic: Results of an International Meeting (2020) in Gastroenterology
  • Comparative Effectiveness of Multiple Different First-Line Treatment Regimens for Helicobacter pylori Infection: A Network Meta-analysis (2021) in Gastroenterology
  • Selecting End Points for Disease-Modification Trials in Inflammatory Bowel Disease: the SPIRIT Consensus From the IOIBD (2021) in Gastroenterology
  • United European Gastroenterology (UEG) and European Society for Neurogastroenterology and Motility (ESNM) consensus on functional dyspepsia (2021) in United European Gastroenterology Journal

Their frequent collaborators include Javier P. Gisbert, Françis Mégraud, Olga P. Nyssen, Antonio Gasbarrini, and Luís Rodrigo, reflecting a network of partnerships in the field of gastroenterology and related research areas.

Colm O'Morain has been recognized for their scientific work by being named a Member of the Royal Irish Academy in 2011.

Best Publications

  • Association of NOD2 leucine-rich repeat variants with susceptibility to Crohn's disease

    Jean-Pierre Hugot;Mathias Chamaillard;Mathias Chamaillard;Habib Zouali;Suzanne Lesage

  • Management of Helicobacter pylori infection—the Maastricht IV/ Florence Consensus Report

    Peter Malfertheiner;Francis Megraud;John Atherton;Anthony T R Axon

  • Current concepts in the management of Helicobacter pylori infection - The Maastricht III Consensus Report

    Peter Malfertheiner;Francis Megraud;Colm O'Morain;Franco Bazzoli

  • Management of Helicobacter pylori infection—the Maastricht V/Florence Consensus Report

    P. Malfertheiner;F. Mégraud;C. O'Morain;Javier Gisbert

  • Current concepts in the management of Helicobacter pylori infection--the Maastricht 2-2000 Consensus Report.

    P. Malfertheiner;F. Mégraud;C. O'Morain;A. P. S. Hungin

  • The second European evidence-based Consensus on the diagnosis and management of Crohn's disease: Current management

    A. Dignass;G. Van Assche;J.O. Lindsay;M. Lémann

  • Current European concepts in the management of Helicobacter pylori infection the Maastricht Consensus Report

    P. Malfertheiner;F. Megraud;C. O'morain;D. Bell

  • CARD15/NOD2 mutational analysis and genotype-phenotype correlation in 612 patients with inflammatory bowel disease.

    Suzanne Lesage;Habib Zouali;Jean-Pierre Cézard;Jean-Frédéric Colombel

  • Newly identified genetic risk variants for celiac disease related to the immune response

    Karen A Hunt;Alexandra Zhernakova;Graham Turner;Graham A R Heap

  • CAMPYLOBACTER PYLORI AND RECURRENCE OF DUODENAL ULCERS— A 12-MONTH FOLLOW-UP STUDY

    J.G. Coghlan;H. Humphries;C. Dooley;C. Keane

  • Management of precancerous conditions and lesions in the stomach (MAPS): guideline from the European Society of Gastrointestinal Endoscopy (ESGE), European Helicobacter Study Group (EHSG), European Society of Pathology (ESP), and the Sociedade Portuguesa de Endoscopia Digestiva (SPED)

    M. Dinis-Ribeiro;M. Areia;A. C. de Vries;R. Marcos-Pinto

  • Eradication of Helicobacter pylori Using One‐week Triple Therapies Combining Omeprazole with Two Antimicrobials: The MACH I Study

    Tore Lind;Sander Veldhuyzen van Zanten;Peter Unge;Robin Spiller

  • Lack of effect of treating Helicobacter pylori infection in patients with nonulcer dyspepsia. Omeprazole plus Clarithromycin and Amoxicillin Effect One Year after Treatment (OCAY) Study Group.

    A. L. Blum;N. J. Talley;C. O'morain;S. Veldhuyzen Van Zanten

  • European evidence based consensus on the diagnosis and management of Crohn's disease: special situations.

    R. Caprilli;M. A. Gassull;J. C. Escher;G. Moser

  • Geographical variability and environmental risk factors in inflammatory bowel disease

    Siew C. Ng;Charles N. Bernstein;Morten H. Vatn;Peter Laszlo Lakatos

  • Increased mast cells in the irritable bowel syndrome

    M O'Sullivan;N Clayton;N P Breslin;I Harman

  • Diagnosis of Helicobacter pylori infection with a new non-in vasive antigen-based assay

    Dino Vaira;Peter Malfertheiner;Francis Megraud;Anthony Tr Axon

  • The MACH2 study : Role of omeprazole in eradication of Helicobacter pylori with 1-week triple therapies

    Tore Lind;Francis Mégraud;Peter Unge;Ekkehard Bayerdörffer

  • Antimicrobial susceptibility testing of Helicobacter pylori in a large multicenter trial: the MACH 2 study

    Francis Mégraud;Norbert Lehn;Tore Lind;Ekkehard Bayerdörffer

  • Absorption of 151chromium-labeled ethylenediaminetetraacetate in inflammatory bowel disease

    Ingvar Bjarnason;Colm O'Morain;A.Jonathan Levi;Timothy J. Peters

Frequent Co-Authors

Francis Mégraud
Francis Mégraud University of Bordeaux
Javier P. Gisbert
Javier P. Gisbert Autonomous University of Madrid
Dermot Kelleher
Dermot Kelleher University of British Columbia
Pia Munkholm
Pia Munkholm University of Copenhagen
Cliona O'Farrelly
Cliona O'Farrelly Trinity College Dublin
Peter Malfertheiner
Peter Malfertheiner Otto-von-Guericke University Magdeburg
Antonio Gasbarrini
Antonio Gasbarrini Catholic University of the Sacred Heart
Jean-Frederic Colombel
Jean-Frederic Colombel Icahn School of Medicine at Mount Sinai
Conleth Feighery
Conleth Feighery Trinity College Dublin

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