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Lukejohn Day

TitleAssociate Professor
InstitutionUniversity of California San Francisco
DepartmentMedicine
Address1001 Potrero Ave
San Francisco CA 94110
Phone415-206-3832
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    Collapse Biography 
    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

    Collapse Overview 
    Collapse Overview
    Dr. Day is an associate professor of medicine at UCSF, Director of Clinical Gastroenterology at the Zuckerburg San Francisco General Hospital (ZSFG) and the Associate Chief Medical Officer for Specialty Care and Diagnostics at ZSFG. His research interests center on organizational design and development of efficiency models for health care 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 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.


    Collapse Bibliographic 
    Collapse Publications
    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.
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    1. Alsayid M, Singh MH, Issaka R, Laleau V, Day L, Lee J, Allison J, Somsouk M. Yield of Colonoscopy After a Positive Result From a Fecal Immunochemical Test OC-Light. Clin Gastroenterol Hepatol. 2018 Apr 13. PMID: 29660528.
      View in: PubMed
    2. Infection control during GI endoscopy. Gastrointest Endosc. 2018 Mar 21. PMID: 29573782.
      View in: PubMed
    3. Selvig D, Sewell JL, Tuot DS, Day L. 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. PMID: 29321069.
      View in: PubMed
    4. Issaka RB, Singh MH, Rachocki C, Day L, Horton C, Somsouk M. Missed Opportunities in Colorectal Cancer Prevention in Patients With Inadequate Bowel Preparations. Clin Gastroenterol Hepatol. 2018 Jan 09. PMID: 29330098.
      View in: PubMed
    5. Baumgardner JM, Sewell JL, Day L. Assessment of quality indicators among nurse practitioners performing upper endoscopy. Endosc Int Open. 2017 Sep; 5(9):E818-E824. PMID: 28879227.
      View in: PubMed
    6. Day L, 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. Quality indicators for gastrointestinal endoscopy units. VideoGIE. 2017 Jun; 2(6):119-140. PMID: 29905282.
      View in: PubMed
    7. Kouanda AM, Somsouk M, Sewell JL, Day L. Urgent colonoscopy in patients with lower GI bleeding: a systematic review and meta-analysis. Gastrointest Endosc. 2017 Jul; 86(1):107-117.e1. PMID: 28174123.
      View in: PubMed
    8. Lee A, Aditi A, Bhat YM, Binmoeller KF, Hamerski C, Sendino O, Kane S, Cello JP, Day L, Mohamadnejad M, Muthusamy VR, Watson R, Klapman JB, Komanduri S, Wani S, Shah JN. Endoscopic ultrasound-guided biliary access versus precut papillotomy in patients with failed biliary cannulation: a retrospective study. Endoscopy. 2017 Feb; 49(2):146-153. PMID: 28107764.
      View in: PubMed
    9. Issaka RB, Singh MH, Oshima SM, Laleau VJ, Rachocki CD, Chen EH, Day L, Sarkar U, Somsouk M. Inadequate Utilization of Diagnostic Colonoscopy Following Abnormal FIT Results in an Integrated Safety-Net System. Am J Gastroenterol. 2017 Feb; 112(2):375-382. PMID: 28154400.
      View in: PubMed
    10. Hassid BG, Day L, Awad MA, Sewell JL, Osterberg EC, Breyer BN. Using Search Engine Query Data to Explore the Epidemiology of Common Gastrointestinal Symptoms. Dig Dis Sci. 2017 03; 62(3):588-592. PMID: 27878646.
      View in: PubMed
    11. Kidambi TD, Lee R, Terdiman JP, Day L. Successful implementation of Lynch syndrome screening in a safety net institution. J Community Genet. 2016 Jul; 7(3):255-60. PMID: 27372833; PMCID: PMC4960029.
      View in: PubMed, PubMed Central
    12. Diversity in gastroenterology in the United States: Where are we now? Where should we go? Gastrointest Endosc. 2016 Apr; 83(4):679-83. PMID: 26810008.
      View in: PubMed
    13. Chang JT, Sewell JL, Day L. Prevalence and predictors of patient no-shows to outpatient endoscopic procedures scheduled with anesthesia. BMC Gastroenterol. 2015 Sep 30; 15:123. PMID: 26423366; PMCID: PMC4589132.
      View in: PubMed, PubMed Central
    14. Day L, Belson D. Studying and Incorporating Efficiency into Gastrointestinal Endoscopy Centers. Gastroenterol Res Pract. 2015; 2015:764153. PMID: 26101525; PMCID: PMC4458534.
      View in: PubMed, PubMed Central
    15. Day L, Nazareth M, Sewell JL, Williams JL, Lieberman DA. Practice variation in PEG tube placement: trends and predictors among providers in the United States. Gastrointest Endosc. 2015 Jul; 82(1):37-45. PMID: 25845635; PMCID: PMC4469567.
      View in: PubMed, PubMed Central
    16. Day L. Nonphysician Performance of Endoscopy. Gastroenterol Hepatol (N Y). 2015 Mar; 11(3):190-2. PMID: 27099590; PMCID: PMC4836589.
      View in: PubMed, PubMed Central
    17. Day L, Velayos F. Colorectal cancer screening and surveillance in the elderly: updates and controversies. Gut Liver. 2015 Mar; 9(2):143-51. PMID: 25721001; PMCID: PMC4351019.
      View in: PubMed, PubMed Central
    18. Sewell JL, Telischak KS, Day L, Kirschner N, Weissman A. Preconsultation exchange in the United States: use, awareness, and attitudes. Am J Manag Care. 2014 Dec; 20(12):e564-72. PMID: 25665191.
      View in: PubMed
    19. Tuot DS, Sewell JL, Day L, Leeds K, Chen AH. Increasing access to specialty care: patient discharges from a gastroenterology clinic. Am J Manag Care. 2014 Oct; 20(10):812-9. PMID: 25365684.
      View in: PubMed
    20. Day L, Velayos F. Colorectal cancer of the elderly. Curr Treat Options Gastroenterol. 2014 Sep; 12(3):269-82. PMID: 24938590.
      View in: PubMed
    21. Day L, Belson D, Dessouky M, Hawkins C, Hogan M. Optimizing efficiency and operations at a California safety-net endoscopy center: a modeling and simulation approach. Gastrointest Endosc. 2014 Nov; 80(5):762-73. PMID: 24796958.
      View in: PubMed
    22. 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. Challenges and possible solutions to colorectal cancer screening for the underserved. J Natl Cancer Inst. 2014 Apr; 106(4):dju032. PMID: 24681602; PMCID: PMC3982886.
      View in: PubMed, PubMed Central
    23. Day L, Siao D, Inadomi JM, Somsouk M. Non-physician performance of lower and upper endoscopy: a systematic review and meta-analysis. Endoscopy. 2014 May; 46(5):401-10. PMID: 24627086; PMCID: PMC4153714.
      View in: PubMed, PubMed Central
    24. Day L, Lin L, Somsouk M. Adverse events in older patients undergoing ERCP: a systematic review and meta-analysis. Endosc Int Open. 2014 Mar; 2(1):E28-36. PMID: 26134610; PMCID: PMC4423280.
      View in: PubMed, PubMed Central
    25. Siao D, Sewell JL, Day L. Assessment of delivery methods used in the informed consent process at a safety-net hospital. Gastrointest Endosc. 2014 Jul; 80(1):61-8. PMID: 24518119.
      View in: PubMed
    26. Day L, Velayos F. Colorectal cancer and the elderly. Clin Geriatr Med. 2014 Feb; 30(1):117-31. PMID: 24267607.
      View in: PubMed
    27. Guidelines for safety in the gastrointestinal endoscopy unit. Gastrointest Endosc. 2014 Mar; 79(3):363-72. PMID: 24485393; PMCID: PMC3980655.
      View in: PubMed, PubMed Central
    28. Day L, Lin L, Somsouk M.Adverse events in older patients undergoing ERCP: a systematic review and meta-analysis. Endoscopy International Open. 2014; 1(2):E28-E36.
    29. Sewell JL, Somsouk M, Shah SC, Day L. Commentary: Towards an effective and safe treatment of small intestine bacterial overgrowth - Authors' reply. Aliment Pharmacol Ther. 2013 Dec; 38(11-12):1411. PMID: 24206377.
      View in: PubMed
    30. Day L, Bhuket T, Allison J. FIT testing: an overview. Curr Gastroenterol Rep. 2013 Nov; 15(11):357. PMID: 24218070.
      View in: PubMed
    31. Shah SC, Day L, Somsouk M, Sewell JL. Meta-analysis: antibiotic therapy for small intestinal bacterial overgrowth. Aliment Pharmacol Ther. 2013 Oct; 38(8):925-34. PMID: 24004101; PMCID: PMC3819138.
      View in: PubMed, PubMed Central
    32. Sewell JL, Day L, Tuot DS, Alvarez R, Yu A, Chen AH. A brief, low-cost intervention improves the quality of ambulatory gastroenterology consultation notes. Am J Med. 2013 Aug; 126(8):732-8. PMID: 23791206; PMCID: PMC3730533.
      View in: PubMed, PubMed Central
    33. Day L, Bhuket T, Inadomi JM, Yee HF. 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. PMID: 23767938; PMCID: PMC3693938.
      View in: PubMed, PubMed Central
    34. Day L, Michelle N, Sewell JL.Open Journal of Gastroenterology. Patient preferences and factors related to the pre-procedure process at a large, urban county hospital. 2013; 3:5-11.
    35. Siao D, Thoeni R, Grenert JP, Day L. A rare presentation of abdominal pain: idiopathic mesenteric phlebosclerosis. Am J Gastroenterol. 2012 Nov; 107(11):1759-60. PMID: 23160302.
      View in: PubMed
    36. Day L, Kwon A, Inadomi JM, Walter LC, Somsouk M. Adverse events in older patients undergoing colonoscopy: a systematic review and meta-analysis. Gastrointest Endosc. 2011 Oct; 74(4):885-96. PMID: 21951478; PMCID: PMC3371336.
      View in: PubMed, PubMed Central
    37. Day L, Cello JP, Somsouk M, Inadomi JM. 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. PMID: 21948130.
      View in: PubMed
    38. Day L, Walter LC, Velayos F. Colorectal cancer screening and surveillance in the elderly patient. Am J Gastroenterol. 2011 Jul; 106(7):1197-206;quiz 1207. PMID: 21519362.
      View in: PubMed
    39. Day L, Espey DK, Madden E, Segal M, Terdiman JP. 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. PMID: 21234688; PMCID: PMC3112488.
      View in: PubMed, PubMed Central
    40. Day L, Cello JP, Madden E, Segal M. Prospective assessment of inpatient gastrointestinal consultation requests in an academic teaching hospital. Am J Gastroenterol. 2010 Mar; 105(3):484-9. PMID: 20203634.
      View in: PubMed
    41. Cello JP, Day L. Idiopathic AIDS enteropathy and treatment of gastrointestinal opportunistic pathogens. Gastroenterology. 2009 May; 136(6):1952-65. PMID: 19457421.
      View in: PubMed
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