University of California San Francisco

Ava Yap
Ava
Yap
MD, MHSc

Graduate
General Surgery Residency Program, 2025

Education

Institution Degree Dept or School End Date
Yale School of Medicine MHS Health Sciences 6/2018
Yale School of Medicine MD Medicine 6/2018
Johns Hopkins University BA Biology 6/2013

Awards & Honors

Award Conferred By Date
Dr. Hilary Sanfey Outsanding Resident Award Association of Women Surgeons 2025
Resident Clinical and Translational Research Funding Award UCSF 2020
Owen H. Wangensteen Scientific Forum Excellence in Research Award American College of Surgeons Clinical Congress 2017
Richard K. Gershion One Year Research Fellowship Yale School of Medicine 2016/2017
Wilbur G. Downs International Health Student Travel Fellowship Yale School of Medicine 2014

In the News

Four Surgery Residents Awarded UCSF CTSI Resident Research Funding
July, 13, 2020 | UCSF General Surgery Residency Program

Publications

MOST RECENT PUBLICATIONS FROM A TOTAL OF 39
  1. Transition to Reusable Surgical Gowns at a Hospital System.
    Yap A, Wang K, Cornejo J, Chen E, Pierce L, Wick E, Gandhi S| | PubMed
  2. Out-of-pocket costs and catastrophic healthcare expenditure for families of children requiring surgery in sub-Saharan Africa.
    Yap A, Olatunji BT, Negash S, Mweru D, Kisembo S, Masumbuko F, Ameh EA, Lebbie A, Bvulani B, Hansen E, Philipo GS, Carroll M, Hsu PJ, Bryce E, Cheung M, Fedatto M, Laverde R, Ozgediz D| | PubMed
  3. Routine Pediatric Surgical Emergencies: Incidence, Morbidity, and Mortality During the 1st 8000 Days of Life-A Narrative Review.
    Abbas A, Laverde R, Yap A, Stephens CQ, Samad L, Seyi-Olajide JO, Ameh EA, Ozgediz D, Lakhoo K, Bickler SW, Meara JG, Bundy D, Jamison DT, Klazura G, Sykes A, Philipo GS, GICS| | PubMed
  4. Surgically Correctable Congenital Anomalies: Reducing Morbidity and Mortality in the First 8000 Days of Life.
    Banu T, Sharma S, Chowdhury TK, Aziz TT, Martin B, Seyi-Olajide JO, Ameh E, Ozgediz D, Lakhoo K, Bickler SW, Meara JG, Bundy D, Jamison DT, Klazura G, Sykes A, Yap A, Philipo GS, GICS| | PubMed
  5. Pediatric Surgical Waitlist in Low Middle Income Countries During the COVID-19 Pandemic.
    Klazura G, Park P, Yap A, Laverde R, Bryce E, Cheung M, Bioh E, Kisa P, Kakembo N, Ugazzi M, Situma M, Borgstein E, Derbew M, Negash S, Tadesse A, Bvulani B, Ki B, Toussaint T, Bokhary Z, Philipo GS, Ameh E, Mulewa M, Mwansa J, Onah I, Amado V, De Ugarte D, Massaga F, Byabato S, Adeyemo WL, Ogunlewe O, Nandi B, Ozgediz D| | PubMed
  6. A mixed-methods study on end-user perceptions of transitioning to reusable surgical gowns.
    Yap A, Wang K, Chen E, Melhado C, Ahmad T, O'Sullivan P, Gandhi S| | PubMed
  7. Postgraduate Surgical Education in East, Central, and Southern Africa: A Needs Assessment Survey.
    Elmaraghi S, Min Park K, Rashidian N, Yap A, Faktor K, Ozgediz D, Borgstein E, Bekele A, Alseidi A, Tefera G| | PubMed
  8. Social vulnerability index (SVI) and poor postoperative outcomes in children undergoing surgery in California.
    Yap A, Laverde R, Thompson A, Ozgediz D, Ehie O, Mpody C, Vu L| | PubMed
  9. Impact of new dedicated pediatric operating rooms on surgical volume in Africa: Evidence from Nigeria.
    Laverde R, Majekodunmi O, Park P, Udeigwe-Okeke CR, Yap A, Klazura G, Ukwu N, Bryce E, Ozgediz D, Ameh EA| | PubMed
  10. Assessment of Surgeon Performance of Advanced Open Surgical Skills Using a Microskills-Based Novel Curriculum.
    Greenberg AL, Karimzada MM, Brian R, Yap A, Luu HY, Ahmed S, Huang CY, Waits SA, Hirose R, Alseidi A, Rapp JH, O'Sullivan PS, Chern H, Syed SM| | PubMed
39
View all 39 Publications
MOST RECENT PUBLICATIONS FROM A TOTAL OF 39
  1. Impact of Reducing Time Lived With Colostomies on Social Stigma Affecting Children With Anorectal Malformations in Southwestern Uganda.
    Oyania F, Stephens CQ, Ullrich S, Kotagal M, Shui AM, Tuhumwire C, Rukundo GZ, Ngonzi J, Yap A, Bajunirwe F, Poenaru D, Ozgediz DE| | PubMed
  2. Long-Term Outcomes of Patients with Digestive Tract Congenital Anomalies and Their Caregivers in Uganda: A Cohort Study.
    Kakembo N, Yap A, Nabirye A, Kisa P, Nimanya S, Okello I, Naluyimbazi R, Mbwali F, Kayima P, Ssewanyana Y, Sekabira J, Ozgediz D| | PubMed
  3. Attitudes toward Sustainability among Surgeons at Ten Academic Hospitals in the United States: Are we Ready, Willing, and Incentivized to Change?
    Sathe TS, Wang JJ, Wang K, Sorrentino TA, Yap A, Ashraf Ganjouei A, O'Sullivan P, Roll GR, Gandhi S, Lee H, Alseidi A, Surgical Sustainability Working Group| | PubMed
  4. Comparative Analysis of Indices for Social Determinants of Health in Pediatric Surgical Populations.
    Stephens CQ, Yap A, Vu L, Saito JM, Barry D, Shui AM, Cockrell H, Cairo S, Wakeman D, Berman L, Greenberg S, Linden AF, Kohler J, Tsao K, Wilson NA| | PubMed
  5. Surgery and the first 8000 days of life: a review.
    Seyi-Olajide J, Ali A, Powell WF, Samad L, Banu T, Abdelhafeez H, Maswime S, Abbas A, Ademuyiwa A, Ameh EA, Abib S, Aziz T, Bickler S, Bundy D, Chowdhury TK, Echeto MA, Evans F, Gathuya Z, Gray R, Hodges S, Jamison D, Klazura G, Lakhoo K, Martin B, Meara J, Nabukenya M, Newton M, Ozgediz D, Rai E, Philipo GS, Sykes A, Yap A| | PubMed
  6. Correlation of Pediatric Surgical Infrastructure With Clinical and Economic Outcomes: A Cohort Study.
    Negash S, Yap A, Stephens CQ, Nigussie BG, Tefera RF, Bryce E, Cheung M, Fedatto M, Laverde R, Ozgediz D, Tadesse A, Derbew M| | PubMed
  7. Development and Internal-External Validation of a Post-Operative Mortality Risk Calculator for Pediatric Surgical Patients in Low- and Middle- Income Countries Using Machine Learning.
    Eyler Dang L, Klazura G, Yap A, Ozgediz D, Bryce E, Cheung M, Fedatto M, Ameh EA| | PubMed
  8. Needs Assessment for the Development of a Sustainability Curriculum for Surgical Residents.
    Matthys M, Wang J, Sathe TS, Wang K, Gandhi S, Lee H, Alseidi A, Sustainability Curriculum Working Group| | PubMed
  9. Promoting Female Surgeons Through Structured Award Nominations.
    Trang K, Stephens CQ, Flanagan C, Yap A, Brown A, Kelly Y, Yeo HL, Sosa JA, Kornblith LZ, Varma MG| | PubMed
  10. Treatment abandonment in children with Wilms tumor at a national referral hospital in Uganda.
    Nanteza S, Yap A, Stephens CQ, Kambagu JB, Kisa P, Kakembo N, Fadil G, Nimanya SA, Okello I, Naluyimbazi R, Mbwali F, Kayima P, Ssewanyana Y, Grabski D, Naik-Mathuria B, Langer M, Ozgediz D, Sekabira J| | PubMed
  11. Cost-effectiveness of a pediatric operating room installation in Sub-Saharan Africa.
    Yap A, Halid SI, Ukwu N, Laverde R, Park P, Klazura G, Bryce E, Cheung M, Marseille E, Ozgediz D, Ameh EA| | PubMed
  12. Essential surgery delivery in the Northern Kivu Province of the Democratic Republic of the Congo.
    Malemo LK, Yap A, Mitume B, Salmon C, Karafuli K, Poenaru D, Onyango R| | PubMed
  13. Efforts to improve outcomes among neonates with complex intestinal atresia: a single-center low-income country experience.
    Okello I, Stephens CQ, Kakembo N, Kisa P, Nimanya S, Yap A, Wesonga AS, Naluyimbazi R, Kayima P, Ssewanyana Y, Ozgediz D, Sekabira J| | PubMed
  14. We asked the experts: Normalize challenges, build community, and develop mentorship: A guide for proactive institutional support for child rearing during surgical training.
    Colley A, Yap A, Trang K, Kornblith LZ, Varma MG, Vu L| | PubMed
  15. Factors associated with trauma recidivism in young children.
    Stephens CQ, Melhado CG, Shui AM, Yap A, Moses W, Jensen AR, Newton C| | PubMed
  16. Pediatric Emergency Surgery Course in Uganda: Long-Term Follow-Up and Insights From Further Dissemination.
    Klazura G, Stephens C, Musinguzi E, Mugarura R, Nyonyintono J, Laverde R, Nimanya S, Situma M, Bua E, Yap A, Sims T, Ozgediz D, Kisa P| | PubMed
  17. Instrument and Supply Variability: An Opportunity to Reduce the Carbon Footprint of the Operating Room.
    Sathe TS, Sorrentino TA, Wang K, Yap A, Wang JJ, Matthys M, Yin R, Alseidi A, Lee H, Gandhi S| | PubMed
  18. The Pediatric Emergency Surgery Course: Impact on Provider Practice in Rural Uganda.
    Klazura G, Situma M, Musinguzi E, Mugarura R, Nyonyintono J, Yap A, Stephens CQ, Ullrich S, Kakembo N, Sekabira J, Ssemeju A, Bwesigye M, Muzaki D, Sims T, Proscovia N, Mbambu J, Kwikiriza D, Arinda F, Ozgediz D, Kisa P| | PubMed
  19. Impact of Bowel Coverage and Resuscitation Protocol on Gastroschisis Mortality in Low-Income Countries: Experience and Lessons From Uganda.
    Nimanya SA, Stephens CQ, Yap A, Kisa P, Kakembo N, Wesonga A, Okello I, Naluyimbazi R, Mbwali F, Kayima P, Ssewanyana Y, Naik-Mathuria B, Ozgediz D, Sekabira J| | PubMed
  20. Determinants of Access to Essential Surgery in the Democratic Republic of Congo.
    Kalisya LM, Yap A, Mitume B, Salmon C, Karafuli K, Poenaru D, Onyango R| | PubMed
  21. Transition to Reusable Surgical Gowns at a Hospital System.
    Yap A, Wang K, Cornejo J, Chen E, Pierce L, Wick E, Gandhi S| | PubMed
  22. Out-of-pocket costs and catastrophic healthcare expenditure for families of children requiring surgery in sub-Saharan Africa.
    Yap A, Olatunji BT, Negash S, Mweru D, Kisembo S, Masumbuko F, Ameh EA, Lebbie A, Bvulani B, Hansen E, Philipo GS, Carroll M, Hsu PJ, Bryce E, Cheung M, Fedatto M, Laverde R, Ozgediz D| | PubMed
  23. Routine Pediatric Surgical Emergencies: Incidence, Morbidity, and Mortality During the 1st 8000 Days of Life-A Narrative Review.
    Abbas A, Laverde R, Yap A, Stephens CQ, Samad L, Seyi-Olajide JO, Ameh EA, Ozgediz D, Lakhoo K, Bickler SW, Meara JG, Bundy D, Jamison DT, Klazura G, Sykes A, Philipo GS, GICS| | PubMed
  24. Surgically Correctable Congenital Anomalies: Reducing Morbidity and Mortality in the First 8000 Days of Life.
    Banu T, Sharma S, Chowdhury TK, Aziz TT, Martin B, Seyi-Olajide JO, Ameh E, Ozgediz D, Lakhoo K, Bickler SW, Meara JG, Bundy D, Jamison DT, Klazura G, Sykes A, Yap A, Philipo GS, GICS| | PubMed
  25. Pediatric Surgical Waitlist in Low Middle Income Countries During the COVID-19 Pandemic.
    Klazura G, Park P, Yap A, Laverde R, Bryce E, Cheung M, Bioh E, Kisa P, Kakembo N, Ugazzi M, Situma M, Borgstein E, Derbew M, Negash S, Tadesse A, Bvulani B, Ki B, Toussaint T, Bokhary Z, Philipo GS, Ameh E, Mulewa M, Mwansa J, Onah I, Amado V, De Ugarte D, Massaga F, Byabato S, Adeyemo WL, Ogunlewe O, Nandi B, Ozgediz D| | PubMed
  26. A mixed-methods study on end-user perceptions of transitioning to reusable surgical gowns.
    Yap A, Wang K, Chen E, Melhado C, Ahmad T, O'Sullivan P, Gandhi S| | PubMed
  27. Postgraduate Surgical Education in East, Central, and Southern Africa: A Needs Assessment Survey.
    Elmaraghi S, Min Park K, Rashidian N, Yap A, Faktor K, Ozgediz D, Borgstein E, Bekele A, Alseidi A, Tefera G| | PubMed
  28. Social vulnerability index (SVI) and poor postoperative outcomes in children undergoing surgery in California.
    Yap A, Laverde R, Thompson A, Ozgediz D, Ehie O, Mpody C, Vu L| | PubMed
  29. Impact of new dedicated pediatric operating rooms on surgical volume in Africa: Evidence from Nigeria.
    Laverde R, Majekodunmi O, Park P, Udeigwe-Okeke CR, Yap A, Klazura G, Ukwu N, Bryce E, Ozgediz D, Ameh EA| | PubMed
  30. Assessment of Surgeon Performance of Advanced Open Surgical Skills Using a Microskills-Based Novel Curriculum.
    Greenberg AL, Karimzada MM, Brian R, Yap A, Luu HY, Ahmed S, Huang CY, Waits SA, Hirose R, Alseidi A, Rapp JH, O'Sullivan PS, Chern H, Syed SM| | PubMed
  31. Estimates of Treatable Deaths Within the First 20 Years of Life from Scaling Up Surgical Care at First-Level Hospitals in Low- and Middle-Income Countries.
    Sykes AG, Seyi-Olajide J, Ameh EA, Ozgediz D, Abbas A, Abib S, Ademuyiwa A, Ali A, Aziz TT, Chowdhury TK, Abdelhafeez H, Ignacio RC, Keller B, Klazura G, Kling K, Martin B, Philipo GS, Thangarajah H, Yap A, Meara JG, Bundy DAP, Jamison DT, Mock CN, Bickler SW, On behalf of the Global Initiative for Children’s Surgery| | PubMed
  32. Operative Management of Cecal Volvulus Herniating Through the Foramen of Winslow
    Yap A, Freise J, Bolinger B, Alkoraishi A| | UCSF Research Profile
  33. Impact of the COVID-19 Pandemic on Pediatric Surgical Volume in Four Low- and Middle-Income Country Hospitals: Insights from an Interrupted Time Series Analysis.
    Park P, Laverde R, Klazura G, Yap A, Bvulani B, Ki B, Tapsoba TW, Ameh EA, Osazuwa M, Ugazzi M, Daza J, Bryce E, Cunningham D, Ozgediz D| | PubMed
  34. A cost-utility analysis of 18F-fluorocholine-positron emission tomography imaging for localizing primary hyperparathyroidism in the United States.
    Yap A, Hope TA, Graves CE, Kluijfhout W, Shen WT, Gosnell JE, Sosa JA, Roman SA, Duh QY, Suh I| | PubMed
  35. Accuracy of the Lymph Node Yield in Surgery for Papillary Thyroid Cancer in Children.
    Yap A, Shui A, Gosnell J, Huang CY, Sosa JA, Roman S| | PubMed
  36. Resectability, Recurrence, and Risk Stratification of Giant Solitary Fibrous Tumors in the Thoracic Cavity.
    Woodard GA, Fels Elliott DR, Yap A, Haro GJ, Kratz JR, Mann MJ, Jones KD, Jablons DM| | PubMed
  37. Best Buy in Public Health or Luxury Expense?: The Cost-effectiveness of a Pediatric Operating Room in Uganda From the Societal Perspective.
    Yap A, Cheung M, Muzira A, Healy J, Kakembo N, Kisa P, Cunningham D, Youngson G, Sekabira J, Yaesoubi R, Ozgediz D| | PubMed
  38. From Procedure to Poverty: Out-of-Pocket and Catastrophic Expenditure for Pediatric Surgery in Uganda.
    Yap A, Cheung M, Kakembo N, Kisa P, Muzira A, Sekabira J, Ozgediz D| | PubMed
  39. A Cost-Effectiveness Analysis of a Pediatric Operating Room in Uganda.
    Yap A, Muzira A, Cheung M, Healy J, Kakembo N, Kisa P, Cunningham D, Youngson G, Sekabira J, Yaesoubi R, Ozgediz D| | PubMed