Dr. Ong is an Assistant Professor at the Department of Population Medicine, Harvard Pilgrim Health Care and Harvard Medical School. She received her PhD in health informatics at the University of New South Wales, Sydney, Australia, and her postdoctoral training at the Boston Children’s Hospital Computational Health Informatics Program.

Dr. Ong’s research combines clinical epidemiology and big data analytics to study disease epidemiology and treatment patterns. Her research interest focuses broadly on leveraging electronic health data to characterize disease phenotypes and risk factors, and to investigate gaps and barriers to evidence-based treatment.


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  1. Ong MS, Lakoma M, Gees Bhosrekar S, Hickok J, McLean L, Murphy M, Poland RE, Purtell N, Ross-Degnan D. Risk factors for suicide attempt in children, adolescents, and young adults hospitalized for mental health disorders. Child Adolesc Ment Health. 2020 Jun 22. View abstract
  2. Barmettler S, Ong MS, Farmer JR, Yang N, Cobbold M, Walter JE, Long AA, Camargo CA. Gastrointestinal manifestations in common variable immunodeficiency (CVID) are associated with an altered immunophenotype including B- and T-cell dysregulation. J Allergy Clin Immunol Pract. 2020 Apr; 8(4):1436-1438.e1. View abstract
  3. Weitzman ER, Ong MS. Rising Prevalence of Comorbid Alcohol and Opioid Use Disorders in Adolescents and Young Adults in the United States. J Gen Intern Med. 2019 10; 34(10):1987-1989. View abstract
  4. Ong MS, Abman S, Austin ED, Feinstein JA, Hopper RK, Krishnan US, Mullen MP, Natter MD, Raj JU, Rosenzweig EB, Mandl KD. Racial and Ethnic Differences in Pediatric Pulmonary Hypertension: An Analysis of the Pediatric Pulmonary Hypertension Network Registry. J Pediatr. 2019 08; 211:63-71.e6. View abstract
  5. Ong MS. A Bayesian Network Approach to Disease Subtype Discovery. Methods Mol Biol. 2019; 1939:299-322. View abstract
  6. Barmettler S, Ong MS, Farmer JR, Choi H, Walter J. Association of Immunoglobulin Levels, Infectious Risk, and Mortality With Rituximab and Hypogammaglobulinemia. JAMA Netw Open. 2018 11 02; 1(7):e184169. View abstract
  7. Ong MS, Magrabi F, Coiera E. Delay in reviewing test results prolongs hospital length of stay: a retrospective cohort study. BMC Health Serv Res. 2018 05 16; 18(1):369. View abstract
  8. Farmer JR, Ong MS, Barmettler S, Yonker LM, Fuleihan R, Sullivan KE, Cunningham-Rundles C, Walter JE. Common Variable Immunodeficiency Non-Infectious Disease Endotypes Redefined Using Unbiased Network Clustering in Large Electronic Datasets. Front Immunol. 2017; 8:1740. View abstract
  9. Ong MS, Mullen MP, Austin ED, Szolovits P, Natter MD, Geva A, Cai T, Kong SW, Mandl KD. Learning a Comorbidity-Driven Taxonomy of Pediatric Pulmonary Hypertension. Circ Res. 2017 Aug 04; 121(4):341-353. View abstract
  10. Raichand S, Dunn AG, Ong MS, Bourgeois FT, Coiera E, Mandl KD. Conclusions in systematic reviews of mammography for breast cancer screening and associations with review design and author characteristics. Syst Rev. 2017 05 22; 6(1):105. View abstract
  11. Ong MS, Mandl KD. Trends in Prostate-Specific Antigen Screening and Prostate Cancer Interventions 3 Years After the U.S. Preventive Services Task Force Recommendation. Ann Intern Med. 2017 03 21; 166(6):451-452. View abstract
  12. Ong MS, Olson KL, Chadwick L, Liu C, Mandl KD. The Impact of Provider Networks on the Co-Prescriptions of Interacting Drugs: A Claims-Based Analysis. Drug Saf. 2017 03; 40(3):263-272. View abstract
  13. Ong MS, Grand RJ, Mandl KD. Trends in Pharmacologic Interventions for Preventing Recurrence of Crohn's Disease After Ileocolonic Surgery. Inflamm Bowel Dis. 2016 10; 22(10):2432-41. View abstract
  14. Ong MS, Olson KL, Cami A, Liu C, Tian F, Selvam N, Mandl KD. Erratum to: Provider patient-sharing networks and multiple-provider prescribing of benzodiazepines. J Gen Intern Med. 2016 May; 31(5):588. View abstract
  15. Ramanan V, Trehan K, Ong ML, Luna JM, Hoffmann HH, Espiritu C, Sheahan TP, Chandrasekar H, Schwartz RE, Christine KS, Rice CM, van Oudenaarden A, Bhatia SN. Viral genome imaging of hepatitis C virus to probe heterogeneous viral infection and responses to antiviral therapies. Virology. 2016 07; 494:236-47. View abstract
  16. Ong MS, Mandl K. Mammography Risks: The Authors Reply. Health Aff (Millwood). 2016 Mar; 35(3):552. View abstract
  17. Ong MS, Mandl KD. New Guidelines For Breast Cancer Screening. Health Aff (Millwood). 2016 Jan; 35(1):180. View abstract
  18. Magrabi F, Ong MS, Coiera E. Health IT for Patient Safety and Improving the Safety of Health IT. Stud Health Technol Inform. 2016; 222:25-36. View abstract
  19. Wang Y, Coiera E, Gallego B, Concha OP, Ong MS, Tsafnat G, Roffe D, Jones G, Magrabi F. Measuring the effects of computer downtime on hospital pathology processes. J Biomed Inform. 2016 Feb; 59:308-15. View abstract
  20. Man MY, Ong MS, Mohamad MS, Deris S, Sulong G, Yunus J, Che Harun FK. A Review on the Bioinformatics Tools for Neuroimaging. Malays J Med Sci. 2015 Dec; 22(Spec Issue):9-19. View abstract
  21. Ong MS, Olson KL, Cami A, Liu C, Tian F, Selvam N, Mandl KD. Provider Patient-Sharing Networks and Multiple-Provider Prescribing of Benzodiazepines. J Gen Intern Med. 2016 Feb; 31(2):164-171. View abstract
  22. Ong MS, Mandl KD. Breast Cancer Diagnoses: The Authors Reply. Health Aff (Millwood). 2015 Jul; 34(7):1253. View abstract
  23. Ong MS, Mandl KD. National expenditure for false-positive mammograms and breast cancer overdiagnoses estimated at $4 billion a year. Health Aff (Millwood). 2015 Apr; 34(4):576-83. View abstract
  24. Magrabi F, Baker M, Sinha I, Ong MS, Harrison S, Kidd MR, Runciman WB, Coiera E. Clinical safety of England's national programme for IT: a retrospective analysis of all reported safety events 2005 to 2011. Int J Med Inform. 2015 Mar; 84(3):198-206. View abstract
  25. Zhou X, Coiera E, Tsafnat G, Arachi D, Ong MS, Dunn AG. Using social connection information to improve opinion mining: Identifying negative sentiment about HPV vaccines on Twitter. Stud Health Technol Inform. 2015; 216:761-5. View abstract
  26. Ong MS, Kohane IS, Cai T, Gorman MP, Mandl KD. Population-level evidence for an autoimmune etiology of epilepsy. JAMA Neurol. 2014 May; 71(5):569-74. View abstract
  27. Ong MS, Umetsu DT, Mandl KD. Consequences of antibiotics and infections in infancy: bugs, drugs, and wheezing. Ann Allergy Asthma Immunol. 2014 May; 112(5):441-445.e1. View abstract
  28. Ong MS, Magrabi F, Post J, Morris S, Westbrook J, Wobcke W, Calcroft R, Coiera E. Communication interventions to improve adherence to infection control precautions: a randomised crossover trial. BMC Infect Dis. 2013 Feb 06; 13:72. View abstract
  29. Ong MS, Magrabi F, Coiera E. Syndromic surveillance for health information system failures: a feasibility study. J Am Med Inform Assoc. 2013 May 01; 20(3):506-12. View abstract
  30. Ong MS, Magrabi F, Jones G, Coiera E. Last Orders: Follow-up of Tests Ordered on the Day of Hospital Discharge. Arch Intern Med. 2012 Sep 24; 172(17):1347-9. View abstract
  31. Ong MS, Magrabi F, Jones G, Coiera E. Let's Just Check That Potassium One More Time . . . : Comment on "Last Orders: Follow-up of Tests Ordered on the Day of Hospital Discharge". Arch Intern Med. 2012 Sep 24; 172(17):1344-53. View abstract
  32. Ong MS, Magrabi F, Coiera E. Automated identification of extreme-risk events in clinical incident reports. J Am Med Inform Assoc. 2012 Jun; 19(e1):e110-8. View abstract
  33. Magrabi F, Ong MS, Runciman W, Coiera E. Patient safety problems associated with heathcare information technology: an analysis of adverse events reported to the US Food and Drug Administration. AMIA Annu Symp Proc. 2011; 2011:853-7. View abstract
  34. Ong MS, Coiera E. Evaluating the effectiveness of clinical alerts: a signal detection approach. AMIA Annu Symp Proc. 2011; 2011:1036-44. View abstract
  35. Magrabi F, Ong MS, Runciman W, Coiera E. Using FDA reports to inform a classification for health information technology safety problems. J Am Med Inform Assoc. 2012 Jan-Feb; 19(1):45-53. View abstract
  36. Ong MS, Coiera E. A systematic review of failures in handoff communication during intrahospital transfers. Jt Comm J Qual Patient Saf. 2011 Jun; 37(6):274-84. View abstract
  37. Dunn AG, Ong MS, Westbrook JI, Magrabi F, Coiera E, Wobcke W. A simulation framework for mapping risks in clinical processes: the case of in-patient transfers. J Am Med Inform Assoc. 2011 May 01; 18(3):259-66. View abstract
  38. Magrabi F, Ong MS, Runciman W, Coiera E. An analysis of computer-related patient safety incidents to inform the development of a classification. J Am Med Inform Assoc. 2010 Nov-Dec; 17(6):663-70. View abstract
  39. Ong MS, Magrabi F, Coiera E. Automated categorisation of clinical incident reports using statistical text classification. Qual Saf Health Care. 2010 Dec; 19(6):e55. View abstract
  40. Ong MS, Coiera E. Safety through redundancy: a case study of in-hospital patient transfers. Qual Saf Health Care. 2010 Oct; 19(5):e32. View abstract
  41. Holstein JH, Herrmann M, Splett C, Herrmann W, Garcia P, Histing T, Graeber S, Ong MF, Kurz K, Siebel T, Menger MD, Pohlemann T. Low serum folate and vitamin B-6 are associated with an altered cancellous bone structure in humans. Am J Clin Nutr. 2009 Nov; 90(5):1440-5. View abstract