Clinical Focus


  • Gastroenterology

Academic Appointments


Professional Education


  • Board Certification: American Board of Internal Medicine, Internal Medicine (2014)
  • Fellowship: Mayo Clinic Gastroenterology Fellowship (2019) MN
  • Board Certification: American Board of Internal Medicine, Gastroenterology (2018)
  • Fellowship: Mayo Clinic Gastroenterology Fellowship (2018) MN
  • Residency: Indiana University Internal Medicine Residency (2014) IN
  • Medical Education: American University of Beirut Office of the Registrar (2009) Lebanon

Clinical Trials


  • Extension Study to PTR-01-002 Not Recruiting

    A sub-set of patients who participated in PTR-01-002 will be enrolled in an open-label study, if they meet the study eligibility criteria.

    Stanford is currently not accepting patients for this trial. For more information, please contact Irene Bailey, 650-721-7149.

    View full details

All Publications


  • Diagnostic journeys: characterization of patients and diagnostic outcomes from an academic second opinion clinic. Diagnosis (Berlin, Germany) Chao, S., Lotfi, J., Lin, B., Shaw, J., Jhandi, S., Mahoney, M., Singh, B., Nguyen, L., Halawi, H., Geng, L. N. 2022

    Abstract

    Diagnostic programs and second opinion clinics have grown and evolved in the recent years to help patients with rare, puzzling, and complex conditions who often suffer prolonged diagnostic journeys, but there is a paucity of literature on the clinical characteristics of these patients and the efficacy of these diagnostic programs. This study aims to characterize the diagnostic journey, case features, and diagnostic outcomes of patients referred to a team-based second opinion clinic at Stanford.Retrospective chart review was performed for 237 patients evaluated for diagnostic second opinion in the Stanford Consultative Medicine Clinic over a 5 year period. Descriptive case features and diagnostic outcomes were assessed, and correlation between the two was analyzed.Sixty-three percent of our patients were women. 49% of patients had a potential precipitating event within about a month prior to the start of their illness, such as medication change, infection, or medical procedure. A single clear diagnosis was determined in 33% of cases, whereas the remaining cases were assessed to have multifactorial contributors/diagnoses (20%) or remained unclear despite extensive evaluation (47%). Shorter duration of illness, fewer prior specialties seen, and single chief symptom were associated with higher likelihood of achieving a single clear diagnosis.A single-site academic consultative service can offer additional diagnostic insights for about half of all patients evaluated for puzzling conditions. Better understanding of the clinical patterns and patient experiences gained from this study helps inform strategies to shorten their diagnostic odysseys.

    View details for DOI 10.1515/dx-2022-0029

    View details for PubMedID 35596123