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Lukejohn Day, MD

Title(s)Professor, Medicine
SchoolSchool of Medicine
Address1001 Potrero Ave
San Francisco CA 94110
Phone628-206-3832
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    Collapse Education and Training
    Yale UniversityB.S.1998Chemistry
    Stanford University M.D.2004Medicine
    University of California, San FranciscoResidency 2007Internal Medicine
    University of California, San FranciscoFellowship2010Gastroenterology

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    Collapse Overview
    Dr. Day is a professor of medicine at UCSF and the Chief Medical Officer at the Zuckerberg San Francisco General Hospital (ZSFG). His research interests center on organizational design, quality and systems improvement, and development of efficiency models for healthcare system delivery to vulnerable patient populations. Specifically, his research explores the delivery of healthcare through the endoscopy center. He is currently working on developing key innovations that can be implemented at the ZSFG endoscopy center that focus on maximizing staff and physician efficiency, improving patient access to endoscopic care, and strengthening patient and staff satisfaction. His research has spanned projects that have examined the quality of outpatient GI consultation notes, improving patient access though implementing a set of discharge criteria after endoscopy, studying the informed consent process in endoscopy education classes and improving endoscopy center operational efficiency using time and motion studies and simulation modeling.

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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Multisociety guideline on reprocessing flexible GI endoscopes and accessories. Gastrointest Endosc. 2021 Jan; 93(1):11-33.e6. Day LW, Muthusamy VR, Collins J, Kushnir VM, Sawhney MS, Thosani NC, Wani S. PMID: 33353611.
      View in: PubMed   Mentions:    Fields:    
    2. American Society for Gastrointestinal Endoscopy Infection Control Summit: updates, challenges, and the future of infection control in GI endoscopy. Gastrointest Endosc. 2021 Jan; 93(1):1-10. Day LW, Kwok K, Visrodia K, Petersen BT. PMID: 32819676.
      View in: PubMed   Mentions: 1     Fields:    
    3. Effect of individualized feedback on learning curves in EGD and colonoscopy: a cluster randomized controlled trial. Gastrointest Endosc. 2020 04; 91(4):882-893.e4. Han S, Obuch JC, Keswani RN, Hall M, Patel SG, Menard-Katcher P, Simon V, Ezekwe E, Aagaard E, Ahmad A, Alghamdi S, Austin K, Brimhall B, Broy C, Carlin L, Cooley M, Di Palma JA, Duloy AM, Early DS, Ellert S, Gaumnitz EA, Goyal J, Kathpalia P, Day L, El-Nachef N, Kerman D, Lee RH, Lunsford T, Mittal M, Morigeau K, Pietrak S, Piper M, Shah AS, Shapiro AB, Shergill A, Sonnier W, Sorrell C, Vignesh S, Wani S. PMID: 31715173.
      View in: PubMed   Mentions:    Fields:    
    4. Diversity Within US Gastroenterology Physician Practices: The Pipeline, Cultural Competencies, and Gastroenterology Societies Approaches. Gastroenterology. 2019 03; 156(4):829-833. Carethers JM, Quezada SM, Carr RM, Day LW. PMID: 30452917.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    5. Yield of Colonoscopy After a Positive Result From a Fecal Immunochemical Test OC-Light. Clin Gastroenterol Hepatol. 2018 10; 16(10):1593-1597.e1. Alsayid M, Singh MH, Issaka R, Laleau V, Day L, Lee J, Allison J, Somsouk M. PMID: 29660528.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    6. ASGE guideline for infection control during GI endoscopy. Gastrointest Endosc. 2018 05; 87(5):1167-1179. Calderwood AH, Day LW, Muthusamy VR, Collins J, Hambrick RD, Brock AS, Guda NM, Buscaglia JM, Petersen BT, Buttar NS, Khanna LG, Kushnir VM, Repaka A, Villa NA, Eisen GM. PMID: 29573782.
      View in: PubMed   Mentions: 27     Fields:    Translation:HumansPHPublic Health
    7. Gastroenterologist and primary care perspectives on a post-endoscopy discharge policy: impact on clinic wait times, provider satisfaction and provider workload. BMC Health Serv Res. 2018 01 10; 18(1):16. Selvig D, Sewell JL, Tuot DS, Day LW. PMID: 29321069.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    8. Missed Opportunities in Colorectal Cancer Prevention in Patients With Inadequate Bowel Preparations. Clin Gastroenterol Hepatol. 2018 09; 16(9):1533-1534. Issaka RB, Singh MH, Rachocki C, Day LW, Horton C, Somsouk M. PMID: 29330098.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    9. Assessment of quality indicators among nurse practitioners performing upper endoscopy. Endosc Int Open. 2017 Sep; 5(9):E818-E824. Baumgardner JM, Sewell JL, Day LW. PMID: 28879227.
      View in: PubMed   Mentions:
    10. Quality indicators for gastrointestinal endoscopy units. VideoGIE. 2017 Jun; 2(6):119-140. Day LW, Cohen J, Greenwald D, Petersen BT, Schlossberg NS, Vicari JJ, Calderwood AH, Chapman FJ, Cohen LB, Eisen G, Gerstenberger PD, Hambrick RD, Inadomi JM, MacIntosh D, Sewell JL, Valori R. PMID: 29905282.
      View in: PubMed   Mentions:
    11. Urgent colonoscopy in patients with lower GI bleeding: a systematic review and meta-analysis. Gastrointest Endosc. 2017 Jul; 86(1):107-117.e1. Kouanda AM, Somsouk M, Sewell JL, Day LW. PMID: 28174123.
      View in: PubMed   Mentions: 11     Fields:    Translation:HumansPHPublic Health
    12. Endoscopic ultrasound-guided biliary access versus precut papillotomy in patients with failed biliary cannulation: a retrospective study. Endoscopy. 2017 Feb; 49(2):146-153. Lee A, Aditi A, Bhat YM, Binmoeller KF, Hamerski C, Sendino O, Kane S, Cello JP, Day LW, Mohamadnejad M, Muthusamy VR, Watson R, Klapman JB, Komanduri S, Wani S, Shah JN. PMID: 28107764.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    13. Inadequate Utilization of Diagnostic Colonoscopy Following Abnormal FIT Results in an Integrated Safety-Net System. Am J Gastroenterol. 2017 02; 112(2):375-382. Issaka RB, Singh MH, Oshima SM, Laleau VJ, Rachocki CD, Chen EH, Day LW, Sarkar U, Somsouk M. PMID: 28154400.
      View in: PubMed   Mentions: 21     Fields:    Translation:Humans
    14. Using Search Engine Query Data to Explore the Epidemiology of Common Gastrointestinal Symptoms. Dig Dis Sci. 2017 03; 62(3):588-592. Hassid BG, Day LW, Awad MA, Sewell JL, Osterberg EC, Breyer BN. PMID: 27878646.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    15. Successful implementation of Lynch syndrome screening in a safety net institution. J Community Genet. 2016 Jul; 7(3):255-60. Kidambi TD, Lee R, Terdiman JP, Day L. PMID: 27372833.
      View in: PubMed   Mentions:
    16. Diversity in gastroenterology in the United States: Where are we now? Where should we go? Gastrointest Endosc. 2016 Apr; 83(4):679-83. , Day LW, Gonzalez S, Ladd AM, Bucobo JC, Pickett-Blakely O, Tilara A, Christie J. PMID: 26810008.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    17. Prevalence and predictors of patient no-shows to outpatient endoscopic procedures scheduled with anesthesia. BMC Gastroenterol. 2015 Sep 30; 15:123. Chang JT, Sewell JL, Day LW. PMID: 26423366.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    18. Studying and Incorporating Efficiency into Gastrointestinal Endoscopy Centers. Gastroenterol Res Pract. 2015; 2015:764153. Day LW, Belson D. PMID: 26101525.
      View in: PubMed   Mentions:
    19. Practice variation in PEG tube placement: trends and predictors among providers in the United States. Gastrointest Endosc. 2015 Jul; 82(1):37-45. Day LW, Nazareth M, Sewell JL, Williams JL, Lieberman DA. PMID: 25845635.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    20. Colorectal cancer screening and surveillance in the elderly: updates and controversies. Gut Liver. 2015 Mar; 9(2):143-51. Day LW, Velayos F. PMID: 25721001.
      View in: PubMed   Mentions: 12     Fields:    Translation:HumansPHPublic Health
    21. Nonphysician Performance of Endoscopy. Gastroenterol Hepatol (N Y). 2015 Mar; 11(3):190-2. Day LW. PMID: 27099590.
      View in: PubMed   Mentions:
    22. Preconsultation exchange in the United States: use, awareness, and attitudes. Am J Manag Care. 2014 Dec; 20(12):e564-72. Sewell JL, Telischak KS, Day LW, Kirschner N, Weissman A. PMID: 25665191.
      View in: PubMed   Mentions:
    23. Increasing access to specialty care: patient discharges from a gastroenterology clinic. Am J Manag Care. 2014 Oct; 20(10):812-9. Tuot DS, Sewell JL, Day L, Leeds K, Chen AH. PMID: 25365684.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    24. Colorectal cancer of the elderly. Curr Treat Options Gastroenterol. 2014 Sep; 12(3):269-82. Day LW, Velayos F. PMID: 24938590.
      View in: PubMed   Mentions:
    25. Optimizing efficiency and operations at a California safety-net endoscopy center: a modeling and simulation approach. Gastrointest Endosc. 2014 Nov; 80(5):762-73. Day LW, Belson D, Dessouky M, Hawkins C, Hogan M. PMID: 24796958.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    26. Challenges and possible solutions to colorectal cancer screening for the underserved. J Natl Cancer Inst. 2014 Apr; 106(4):dju032. Gupta S, Sussman DA, Doubeni CA, Anderson DS, Day L, Deshpande AR, Elmunzer BJ, Laiyemo AO, Mendez J, Somsouk M, Allison J, Bhuket T, Geng Z, Green BB, Itzkowitz SH, Martinez ME. PMID: 24681602.
      View in: PubMed   Mentions: 72     Fields:    Translation:HumansPHPublic Health
    27. Non-physician performance of lower and upper endoscopy: a systematic review and meta-analysis. Endoscopy. 2014 May; 46(5):401-10. Day LW, Siao D, Inadomi JM, Somsouk M. PMID: 24627086.
      View in: PubMed   Mentions: 10     Fields:    Translation:Humans
    28. Adverse events in older patients undergoing ERCP: a systematic review and meta-analysis. Endosc Int Open. 2014 Mar; 2(1):E28-36. Day LW, Lin L, Somsouk M. PMID: 26134610.
      View in: PubMed   Mentions:
    29. Assessment of delivery methods used in the informed consent process at a safety-net hospital. Gastrointest Endosc. 2014 Jul; 80(1):61-8. Siao D, Sewell JL, Day LW. PMID: 24518119.
      View in: PubMed   Mentions: 3     Fields:    Translation:HumansCTClinical Trials
    30. Colorectal cancer and the elderly. Clin Geriatr Med. 2014 Feb; 30(1):117-31. Day LW, Velayos F. PMID: 24267607.
      View in: PubMed   Mentions:    Fields:    Translation:HumansPHPublic Health
    31. Guidelines for safety in the gastrointestinal endoscopy unit. Gastrointest Endosc. 2014 Mar; 79(3):363-72. , Calderwood AH, Chapman FJ, Cohen J, Cohen LB, Collins J, Day LW, Early DS. PMID: 24485393.
      View in: PubMed   Mentions: 16     Fields:    Translation:HumansPHPublic Health
    32. Adverse events in older patients undergoing ERCP: a systematic review and meta-analysis. Endoscopy International Open. 2014; 1(2):E28-E36. Day LW, Lin L, Somsouk M.
    33. Commentary: Towards an effective and safe treatment of small intestine bacterial overgrowth - Authors' reply. Aliment Pharmacol Ther. 2013 Dec; 38(11-12):1411. Sewell JL, Somsouk M, Shah SC, Day LW. PMID: 24206377.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    34. FIT testing: an overview. Curr Gastroenterol Rep. 2013 Nov; 15(11):357. Day LW, Bhuket T, Allison J. PMID: 24218070.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    35. Meta-analysis: antibiotic therapy for small intestinal bacterial overgrowth. Aliment Pharmacol Ther. 2013 Oct; 38(8):925-34. Shah SC, Day LW, Somsouk M, Sewell JL. PMID: 24004101.
      View in: PubMed   Mentions: 38     Fields:    Translation:Humans
    36. A brief, low-cost intervention improves the quality of ambulatory gastroenterology consultation notes. Am J Med. 2013 Aug; 126(8):732-8. Sewell JL, Day LW, Tuot DS, Alvarez R, Yu A, Chen AH. PMID: 23791206.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    37. Diversity of endoscopy center operations and practice variation across California's safety-net hospital system: a statewide survey. BMC Res Notes. 2013 Jun 15; 6:233. Day LW, Bhuket T, Inadomi JM, Yee HF. PMID: 23767938.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    38. Open Journal of Gastroenterology. Patient preferences and factors related to the pre-procedure process at a large, urban county hospital. 2013; 3:5-11. Day LW, Michelle N, Sewell JL.
    39. A rare presentation of abdominal pain: idiopathic mesenteric phlebosclerosis. Am J Gastroenterol. 2012 Nov; 107(11):1759-60. Siao D, Thoeni R, Grenert JP, Day LW. PMID: 23160302.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    40. Adverse events in older patients undergoing colonoscopy: a systematic review and meta-analysis. Gastrointest Endosc. 2011 Oct; 74(4):885-96. Day LW, Kwon A, Inadomi JM, Walter LC, Somsouk M. PMID: 21951478.
      View in: PubMed   Mentions: 45     Fields:    Translation:Humans
    41. Prevalence of gastric cancer versus colorectal cancer in Asians with a positive fecal occult blood test. Indian J Gastroenterol. 2011 Sep; 30(5):209-16. Day LW, Cello JP, Somsouk M, Inadomi JM. PMID: 21948130.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    42. Colorectal cancer screening and surveillance in the elderly patient. Am J Gastroenterol. 2011 Jul; 106(7):1197-206;quiz 1207. Day LW, Walter LC, Velayos F. PMID: 21519362.
      View in: PubMed   Mentions: 15     Fields:    Translation:Humans
    43. Screening prevalence and incidence of colorectal cancer among American Indian/Alaskan natives in the Indian Health Service. Dig Dis Sci. 2011 Jul; 56(7):2104-13. Day LW, Espey DK, Madden E, Segal M, Terdiman JP. PMID: 21234688.
      View in: PubMed   Mentions: 9     Fields:    Translation:Humans
    44. Prospective assessment of inpatient gastrointestinal consultation requests in an academic teaching hospital. Am J Gastroenterol. 2010 Mar; 105(3):484-9. Day LW, Cello JP, Madden E, Segal M. PMID: 20203634.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    45. Idiopathic AIDS enteropathy and treatment of gastrointestinal opportunistic pathogens. Gastroenterology. 2009 May; 136(6):1952-65. Cello JP, Day LW. PMID: 19457421.
      View in: PubMed   Mentions: 17     Fields:    Translation:HumansCells
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