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  • Office

    GBSF: Rheum, Allergy, Imm, UC Davis School of Medicine
    451 Health Sciences Dr. Suite 6510
    Davis, CA 95616
    Phone(530) 752-2884
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Education & Training

  • University of California Davis
    University of California DavisFellowship, Allergy and Immunology, 1989 - 1991
  • Scripps Mercy Hospital
    Scripps Mercy HospitalResidency, Internal Medicine, 1980 - 1983
  • University of California San Diego School of Medicine
    University of California San Diego School of MedicineClass of 1980
  • Stanford University
    Stanford UniversityBS, 1976

Certifications & Licensure

  • CA State Medical License
    CA State Medical License 1982 - 2021
  • American Board of Allergy and Immunology Allergy & Immunology
  • American Board of Internal Medicine Internal Medicine

Awards, Honors, & Recognition

  • Top Doctors in Sacramento Region Sacramento Magazine, 2003,, 2007, 2016-2018
  • Meaningful Use Stage 1 Certification Centers for Medicare & Medicaid Services, 2011
  • Volunteer Faculty Award AAAA&I, 1996
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Publications & Presentations


Journal Articles

  • Allergies and asthma in sports.  
    Ryhal BT, Allergy and Asthma, Fall 1998:15-16
  • What’s new in asthma treatment?  
    Ryhal BT, Allergy and Asthma, Fall 1997:4-5
  • A comparison of four skin test devices in patients with allergic rhinitis.  
    Ryhal BT, Halpern GM, Davis PA, Garcelon M, Immunol All Practice 1991;13:353-58
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Books/Book Chapters


  • Angioedema-Not! Eosinophilic fasciitis presenting as angioedema (abs).
    Barzaga, PA, Ryhal B, Carroll P, J Allergy Clin Immunol 2003;111:S323
  • Are autoantibodies present in patients with subacute and chronic urticaria?
    Ryhal BT, Gershwin ME, Shoenfeld Y, Peter JB, J Allergy Clin Immunol 2000;105:S40
  • In vitro activation of human neutrophils leads to upregulation of a subpopulation-specific antigen identified by monoclonal.
    Ryhal BT, Cha S, Clement LT, Fletcher MP, Clinical Research 1990;38:111
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Professional Memberships

Hospital Affiliations