Ava Yap, MD

Title(s)RESIDENT PHYSICIAN, Surgery
SchoolSchool of Medicine
Address35 Medical Center Way, #001
San Francisco CA 94143
ORCID ORCID Icon0000-0002-4650-2845 Additional info
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    Collapse Biography 
    Collapse Education and Training
    Johns Hopkins University, Baltimore, MD, USABA6/2013Biology
    Yale School of Medicine, New Haven, CT, USAMD6/2018Medicine
    Yale School of Medicine, New Haven, CT, USAMHS6/2018Health Sciences
    Collapse Awards and Honors
    UCSF2020Resident Clinical and Translational Research Funding Award
    American College of Surgeons Clinical Congress2017Owen H. Wangensteen Scientific Forum Excellence in Research Award
    Yale School of Medicine2016  - 2017Richard K. Gershion One Year Research Fellowship
    Yale School of Medicine2014Wilbur G. Downs International Health Student Travel Fellowship

    Collapse Overview 
    Collapse Overview
    Ava Yap, MD, MHS was born in Canada and spent her upbringing in Hong Kong before moving to the US for college. She is now a general surgery trainee at UCSF. She previously worked in a range of healthcare systems in Canada, Peru, Ecuador, Uganda and Malaysia, all which fostered a dedicated interest in addressing the global health inequity witnessed during her travels.

    She is mentored by the Director of the UCSF Center of Health Equity in Surgery and Anesthesia (CHESA) Dr. Doruk Ozgediz. She also collaborates with the pediatric surgical team in Makerere University in Kampala, Uganda and charity KidsOR to work towards alleviating the tremendous deficit in pediatric surgical capacity in Sub-Saharan Africa. She completed her Master’s in Health Sciences and conducted a cost-effectiveness analysis (CEA) that demonstrated that implementation of a pediatric operating room in Uganda was very cost effective. These results strengthened international partnerships with involved sites in low-middle income countries (LMICs), expanded operating room facilities in 21+ LMICs, and mobilized stakeholders to take notice in the investment of pediatric surgical infrastructure worldwide.

    In her residency research years, she completed a 2-year CHESA health equity fellowship, partnering with KidsOR, Mulago National Referral Hospital, and other global organizations to continue the economic and clinical evaluation of surgical capacity building in low resource settings as she plans to forge a career towards global academic pediatric surgery. Her health equity interests were also rooted domestically, as she collaborated with the National Surgical Quality Improvement Program in Pediatrics to investigate the association between social determinants of health and postoperative outcomes in children, led by her mentor and Associate Program Director Dr. Lan Vu.

    She additionally has an interest in perioperative sustainbility and have integrated herself with the UCSF Sustainbility committee, working alongside Director Dr. Seema Gandhi to pilot reusable textiles in the perioperative space.

    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. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Comparative Analysis of Indices for Social Determinants of Health in Pediatric Surgical Populations. JAMA Netw Open. 2024 Dec 02; 7(12):e2449672. 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. PMID: 39656457; PMCID: PMC11632545.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    2. Surgery and the first 8000 days of life: a review. Int Health. 2024 Nov 18. 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. PMID: 39552326.
      View in: PubMed   Mentions:    Fields:    
    3. Correlation of Pediatric Surgical Infrastructure With Clinical and Economic Outcomes: A Cohort Study. J Surg Res. 2024 Nov; 303:215-223. Negash S, Yap A, Stephens CQ, Nigussie BG, Tefera RF, Bryce E, Cheung M, Fedatto M, Laverde R, Ozgediz D, Tadesse A, Derbew M. PMID: 39369594.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    4. 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. J Pediatr Surg. 2024 Dec; 59(12):161883. Eyler Dang L, Klazura G, Yap A, Ozgediz D, Bryce E, Cheung M, Fedatto M, Ameh EA. PMID: 39317568.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    5. Needs Assessment for the Development of a Sustainability Curriculum for Surgical Residents. J Surg Educ. 2024 Oct; 81(10):1437-1445. Matthys M, Wang J, Sathe TS, Wang K, Gandhi S, Lee H, Alseidi A, Sustainability Curriculum Working Group. PMID: 39129111.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    6. Promoting Female Surgeons Through Structured Award Nominations. Ann Surg. 2024 Jul 02. Trang K, Stephens CQ, Flanagan C, Yap A, Brown A, Kelly Y, Yeo HL, Sosa JA, Kornblith LZ, Varma MG. PMID: 38953217.
      View in: PubMed   Mentions:    Fields:    
    7. Treatment abandonment in children with Wilms tumor at a national referral hospital in Uganda. Pediatr Surg Int. 2024 Jun 27; 40(1):162. 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. PMID: 38926234; PMCID: PMC11208238.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    8. Cost-effectiveness of a pediatric operating room installation in Sub-Saharan Africa. PLOS Glob Public Health. 2024; 4(3):e0001748. Yap A, Halid SI, Ukwu N, Laverde R, Park P, Klazura G, Bryce E, Cheung M, Marseille E, Ozgediz D, Ameh EA. PMID: 38536860; PMCID: PMC10971580.
      View in: PubMed   Mentions:
    9. Essential surgery delivery in the Northern Kivu Province of the Democratic Republic of the Congo. BMC Surg. 2024 Mar 22; 24(1):95. Malemo LK, Yap A, Mitume B, Salmon C, Karafuli K, Poenaru D, Onyango R. PMID: 38519894; PMCID: PMC10958871.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    10. Efforts to improve outcomes among neonates with complex intestinal atresia: a single-center low-income country experience. Pediatr Surg Int. 2024 Mar 06; 40(1):70. Okello I, Stephens CQ, Kakembo N, Kisa P, Nimanya S, Yap A, Wesonga AS, Naluyimbazi R, Kayima P, Ssewanyana Y, Ozgediz D, Sekabira J. PMID: 38446259; PMCID: PMC10917857.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    11. We asked the experts: Normalize challenges, build community, and develop mentorship: A guide for proactive institutional support for child rearing during surgical training. World J Surg. 2024 03; 48(3):524-526. Colley A, Yap A, Trang K, Kornblith LZ, Varma MG, Vu L. PMID: 38363000.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    12. Factors associated with trauma recidivism in young children. J Trauma Acute Care Surg. 2024 Sep 01; 97(3):421-428. Stephens CQ, Melhado CG, Shui AM, Yap A, Moses W, Jensen AR, Newton C. PMID: 38189666.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    13. Pediatric Emergency Surgery Course in Uganda: Long-Term Follow-Up and Insights From Further Dissemination. J Surg Res. 2024 Mar; 295:837-845. 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. PMID: 38194867; PMCID: PMC10922965.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    14. Instrument and Supply Variability: An Opportunity to Reduce the Carbon Footprint of the Operating Room. J Surg Res. 2024 Mar; 295:732-739. Sathe TS, Sorrentino TA, Wang K, Yap A, Wang JJ, Matthys M, Yin R, Alseidi A, Lee H, Gandhi S. PMID: 38142576.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    15. The Pediatric Emergency Surgery Course: Impact on Provider Practice in Rural Uganda. J Pediatr Surg. 2024 Jan; 59(1):146-150. 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. PMID: 37914591; PMCID: PMC10842949.
      View in: PubMed   Mentions: 3     Fields:    Translation:HumansPHPublic Health
    16. Impact of Bowel Coverage and Resuscitation Protocol on Gastroschisis Mortality in Low-Income Countries: Experience and Lessons From Uganda. J Pediatr Surg. 2024 Jan; 59(1):151-157. 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. PMID: 37838617.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    17. Determinants of Access to Essential Surgery in the Democratic Republic of Congo. J Surg Res. 2023 11; 291:480-487. Kalisya LM, Yap A, Mitume B, Salmon C, Karafuli K, Poenaru D, Onyango R. PMID: 37536189.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    18. Transition to Reusable Surgical Gowns at a Hospital System. JAMA Netw Open. 2023 08 01; 6(8):e2330246. Yap A, Wang K, Cornejo J, Chen E, Pierce L, Wick E, Gandhi S. PMID: 37606928; PMCID: PMC10445178.
      View in: PubMed   Mentions: 1     Fields:    
    19. Out-of-pocket costs and catastrophic healthcare expenditure for families of children requiring surgery in sub-Saharan Africa. Surgery. 2023 09; 174(3):567-573. 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. PMID: 37385869.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    20. Routine Pediatric Surgical Emergencies: Incidence, Morbidity, and Mortality During the 1st 8000 Days of Life-A Narrative Review. World J Surg. 2023 12; 47(12):3419-3428. 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. PMID: 37341797; PMCID: PMC10694096.
      View in: PubMed   Mentions: 3     Fields:    Translation:HumansPHPublic Health
    21. Surgically Correctable Congenital Anomalies: Reducing Morbidity and Mortality in the First 8000 Days of Life. World J Surg. 2023 12; 47(12):3408-3418. 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. PMID: 37311874.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    22. Pediatric Surgical Waitlist in Low Middle Income Countries During the COVID-19 Pandemic. J Surg Res. 2023 08; 288:193-201. 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. PMID: 37018896; PMCID: PMC9970937.
      View in: PubMed   Mentions: 4     Fields:    Translation:HumansPHPublic Health
    23. A mixed-methods study on end-user perceptions of transitioning to reusable surgical gowns. Surg Open Sci. 2023 Jan; 11:33-39. Yap A, Wang K, Chen E, Melhado C, Ahmad T, O'Sullivan P, Gandhi S. PMID: 36444285; PMCID: PMC9700296.
      View in: PubMed   Mentions: 2  
    24. Postgraduate Surgical Education in East, Central, and Southern Africa: A Needs Assessment Survey. J Am Coll Surg. 2023 02 01; 236(2):429-435. Elmaraghi S, Min Park K, Rashidian N, Yap A, Faktor K, Ozgediz D, Borgstein E, Bekele A, Alseidi A, Tefera G. PMID: 36218266.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    25. Social vulnerability index (SVI) and poor postoperative outcomes in children undergoing surgery in California. Am J Surg. 2023 01; 225(1):122-128. Yap A, Laverde R, Thompson A, Ozgediz D, Ehie O, Mpody C, Vu L. PMID: 36184328.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    26. Impact of new dedicated pediatric operating rooms on surgical volume in Africa: Evidence from Nigeria. J Pediatr Surg. 2023 Jan; 58(1):161-166. Laverde R, Majekodunmi O, Park P, Udeigwe-Okeke CR, Yap A, Klazura G, Ukwu N, Bryce E, Ozgediz D, Ameh EA. PMID: 36289035.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    27. Assessment of Surgeon Performance of Advanced Open Surgical Skills Using a Microskills-Based Novel Curriculum. JAMA Netw Open. 2022 09 01; 5(9):e2229787. 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. PMID: 36053533; PMCID: PMC9440404.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    28. 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. World J Surg. 2022 09; 46(9):2114-2122. 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. PMID: 35771254; PMCID: PMC9334432.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    29. Operative Management of Cecal Volvulus Herniating Through the Foramen of Winslow. Clinical Management Issues. 2022; 16(1):1-5. Yap A, Freise J, Bolinger B, Alkoraishi A. View Publication.
    30. 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. World J Surg. 2022 05; 46(5):984-993. 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. PMID: 35267077; PMCID: PMC8908743.
      View in: PubMed   Mentions: 8     Fields:    Translation:HumansCellsPHPublic Health
    31. A cost-utility analysis of 18F-fluorocholine-positron emission tomography imaging for localizing primary hyperparathyroidism in the United States. Surgery. 2022 01; 171(1):55-62. Yap A, Hope TA, Graves CE, Kluijfhout W, Shen WT, Gosnell JE, Sosa JA, Roman SA, Duh QY, Suh I. PMID: 34340823.
      View in: PubMed   Mentions: 8     Fields:    Translation:Humans
    32. Accuracy of the Lymph Node Yield in Surgery for Papillary Thyroid Cancer in Children. World J Surg. 2021 10; 45(10):3092-3098. Yap A, Shui A, Gosnell J, Huang CY, Sosa JA, Roman S. PMID: 34180009.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    33. Resectability, Recurrence, and Risk Stratification of Giant Solitary Fibrous Tumors in the Thoracic Cavity. Ann Surg Oncol. 2021 Sep; 28(9):4953-4959. Woodard GA, Fels Elliott DR, Yap A, Haro GJ, Kratz JR, Mann MJ, Jones KD, Jablons DM. PMID: 33728541.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    34. Best Buy in Public Health or Luxury Expense?: The Cost-effectiveness of a Pediatric Operating Room in Uganda From the Societal Perspective. Ann Surg. 2021 02 01; 273(2):379-386. Yap A, Cheung M, Muzira A, Healy J, Kakembo N, Kisa P, Cunningham D, Youngson G, Sekabira J, Yaesoubi R, Ozgediz D. PMID: 30907755; PMCID: PMC6752983.
      View in: PubMed   Mentions: 5     Fields:    Translation:HumansPHPublic Health
    35. From Procedure to Poverty: Out-of-Pocket and Catastrophic Expenditure for Pediatric Surgery in Uganda. J Surg Res. 2018 12; 232:484-491. Yap A, Cheung M, Kakembo N, Kisa P, Muzira A, Sekabira J, Ozgediz D. PMID: 30463761.
      View in: PubMed   Mentions: 13     Fields:    Translation:Humans
    36. A Cost-Effectiveness Analysis of a Pediatric Operating Room in Uganda. Surgery. 2018 11; 164(5):953-959. Yap A, Muzira A, Cheung M, Healy J, Kakembo N, Kisa P, Cunningham D, Youngson G, Sekabira J, Yaesoubi R, Ozgediz D. PMID: 29801729; PMCID: PMC6399742.
      View in: PubMed   Mentions: 9     Fields:    Translation:Humans
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