Current Role at Stanford

Fellowship Coordinator, Pediatric Gastroenterology
Quality Improvement and Research Coordinator, Stanford Children's Inflammatory Bowel Disease Center

Honors & Awards

  • Staff of the Year Award, Department of Pediatrics, Stanford University School of Medicine (2015)
  • 2015-2016 Outstanding Program Coordinator Award, Fellowship, Stanford University School of Medicine (2016)

Education & Certifications

  • BA, Stanford University, Interdisciplinary Studies in Humanities (2008)


All Publications

  • The Runs: Sudden Copious Ostomy Output in an Acolonic Hirschsprung Disease Patient with Short Gut Syndrome. Digestive diseases and sciences Nakayuenyongsuk, W., Barnes, D., Martin, B., Christofferson, M., Kerner, J. 2018

    View details for PubMedID 30097892

  • send-out fecal calprotectin monitoring in pediatric inflammatory bowel disease. World journal of gastrointestinal pharmacology and therapeutics Rodriguez, A., Yokomizo, L., Christofferson, M., Barnes, D., Khavari, N., Park, K. T. 2017; 8 (2): 127-130


    To assess the correlation between the send-out enzyme-linked immuno sorbent assay (ELISA) and the point-of-care (POC) calprotectin test in pediatric inflammatory bowel disease (IBD) patients.We prospectively collected stool samples in pediatric IBD patients for concomitant send-out ELISA analysis and POC calprotectin testing using the Quantum Blue(®) (QB) Extended immunoassay. Continuous results between 17 to 1000 μg/g were considered for comparison. Agreement between the two tests was measured by a Bland-Altman plot and statistical significance was determined using Pitman's test.Forty-nine stool samples were collected from 31 pediatric IBD patients. The overall means for the rapid and ELISA tests were 580.5 and 522.87 μg/g respectively. Among the 49 samples, 18 (37.5%) had POC calprotectin levels of ≤ 250 μg/g and 31 (62.5%) had levels > 250 μg/g. Calprotectin levels ≤ 250 μg/g show good correlation between the two assays. Less correlation was observed at quantitatively higher calprotectin levels.In pediatric IBD patients, there is better correlation of between ELISA and POC calprotectin measurements at clinically meaningful, low-range levels. Future adoption of POC calprotectin testing in the United States may have utility for guiding clinical decision making in real time.

    View details for DOI 10.4292/wjgpt.v8.i2.127

    View details for PubMedID 28533922

  • Diet to the Rescue: Cessation of Pharmacotherapy After Initiation of Exclusive Enteral Nutrition (EEN) Followed by Strict and Liberalized Specific Carbohydrate Diet (SCD) in Crohn's Disease. Digestive diseases and sciences Nakayuenyongsuk, W., Christofferson, M., Nguyen, K., Burgis, J., Park, K. T. 2017

    View details for DOI 10.1007/s10620-016-4446-1

    View details for PubMedID 28084605

  • Implementation of Depression Screening and Global Health Assessment in Pediatric Subspecialty Clinics. The Journal of adolescent health : official publication of the Society for Adolescent Medicine Iturralde, E., Adams, R. N., Barley, R. C., Bensen, R., Christofferson, M., Hanes, S. J., Maahs, D. M., Milla, C., Naranjo, D., Shah, A. C., Tanenbaum, M. L., Veeravalli, S., Park, K. T., Hood, K. K. 2017


    Adolescents with chronic illness face greater risk of psychosocial difficulties, complicating disease management. Despite increased calls to screen for patient-reported outcomes, clinical implementation has lagged. Using quality improvement methods, this study aimed to investigate the feasibility of standardized screening for depression and assessment of global health and to determine recommended behavioral health follow-up, across three pediatric subspecialty clinics.A total of 109 patients aged 12-22 years (median = 16.6) who were attending outpatient visits for treatment of diabetes (80% type 1), inflammatory bowel disease, or cystic fibrosis completed the 9-item Patient Health Questionnaire (PHQ-9) depression and Patient-Reported Outcomes Measurement Information System (PROMIS) Pediatric Global Health measures on electronic tablets. Patients screening positive on the PHQ-9 received same-day behavioral health assessment and regular phone check-ins to facilitate necessary follow-up care.Overall, 89% of 122 identified patients completed screening during a 6-month window. Patients completed measures in a timely manner (within 3 minutes) without disruption to clinic flow, and they rated the process as easy, comfortable, and valuable. Depression scores varied across disease type. Patients rated lower global health relative to a previously assessed validation cohort. Depression and global health related significantly to certain medical outcomes. Fifteen percent of patients screened positive on the PHQ-9, of whom 50% confirmed attending behavioral health appointments within 6 months of screening.A standardized depression and global health assessment protocol implemented across pediatric subspecialties was feasible and effective. Universal behavioral health screening for adolescents and young adults living with chronic disease is necessary to meet programmatic needs in pediatric subspecialty clinics.

    View details for PubMedID 28830798

  • Spanish and English Language Symposia to Enhance Activation in Pediatric Inflammatory Bowel Disease. Journal of pediatric gastroenterology and nutrition Martin, M., Garcia, M., Christofferson, M., Bensen, R., Yeh, A. M., Park, K. T. 2016; 63 (5): 508-511


    Patient activation is an important consideration for improved health outcomes in the management of chronic diseases. Limited English proficiency (LEP) among patients and primary care providers has been shown to be a predictor for worse health across disease states. We aimed to determine the baseline patient activation measure (PAM) among Spanish-speaking (SP) and English-speaking (ES) pediatric IBD patients and parents, and to describe the feasibility and efficacy of a novel peer-group education symposium designed to enhance patient activation as measured with the PAM.Two separate half-day educational symposia in either Spanish or English were presented and moderated by 2 native Spanish-speaking physicians. Content for each of the presentations were highly standardized and interactive, designed to address each of the activation domains (self-management, collaboration with a health care provider, maintenance of function and prevention of disease exacerbation, and appropriate access to high-quality care). Descriptive statistics were used to describe changes between pre- and post-symposium PAM trends.11 primarily SP and 21 ES families participated in their respective symposium. Paired pre- and post-PAM scores were available from 24 pediatric IBD patients (8 SP; 16 ES) and 41 parents (15 SP; 26 ES). The mean age for SP and ES patients was 11.6 and 12.0 years, and female gender in 80% and 62%, respectively. Paired pre- and post-PAM scores for all participants (n = 65) were analyzed. PAM scores uniformly increased in all 4 groups after the symposia (SP-patients 59.1 to 70.3, P = 0.05; SP-parents 69.8 to 75.2, P = 0.2; ES-patients 59.9 to 64.0, P = 0.08; ES-parents 61.9 to 69.1, P = 0.002), although only the ES-parents group had sufficient sample size (n = 26) to achieve statistical significance. The overall cohort had an aggregate increase from pre-PAM of 62.9 (SD 14.5) to post-PAM of 69.4 (SD 13.9) (<0.001).We describe a novel peer-group educational symposium presented in Spanish and English languages to increase patient and parent activation in pediatric IBD patients and their care-giving parents. The use of PAM to assess levels of activation appears to be feasible and effective in these groups.

    View details for PubMedID 27031374

  • Misdiagnosis of Alpha-1 Antitrypsin Phenotype in an Infant with CMV Infection and Liver Failure DIGESTIVE DISEASES AND SCIENCES Arias, P., Kerner, J., Christofferson, M., Berquist, W., Park, K. T. 2014; 59 (8): 1710-1713

    View details for DOI 10.1007/s10620-014-3094-6

    View details for Web of Science ID 000340051200075

    View details for PubMedID 24633574