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Karen Eileen King, M.D.

Associate Medical Director, Transfusion Medicine
Associate Professor of Pathology


Appointment Phone


Main Location

The Johns Hopkins Hospital

Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

Learn more about our international patient services »


  • Associate Medical Director, Transfusion Medicine
  • Director, Hemapheresis and Transfusion Support
  • Associate Professor of Pathology
  • Associate Professor of Oncology

Centers & Institutes



The Johns Hopkins Hospital

Appointment Phone: 410-614-0205

600 N. Wolfe Street
Sheikh Zayed Tower
Baltimore, MD 21287 map
Phone: 410-614-0205
Fax: 410-955-0247

Johns Hopkins Bayview Medical Center

Appointment Phone: 410-955-2660

4940 Eastern Avenue
Baltimore, MD 21224 map



Research Interests

Apheresis; Transfusion medicine


Dr. Karen King is an associate professor of pathology and oncology at the Johns Hopkins University School of Medicine. Her area of clinical expertise includes pathology. Dr. King serves as the associate medical director of the Division of Transfusion Medicine and the director of the Hemapheresis and Transfusion Support (HATS) service in the Department of Pathology.

She earned her M.D. from the Johns Hopkins University School of Medicine. She completed her residency in anatomic and clinical pathology at Johns Hopkins and performed a fellowship in transfusion medicine at Johns Hopkins.

Dr. King’s research interests include transfusion medicine and apheresis.

She is a member of several professional organizations, including the American Society for Apheresis and the College of American Pathologists. more

    Additional Information

  • Education +


    • Johns Hopkins University School of Medicine / MD; Medicine (1986)


    • Johns Hopkins University School of Medicine / Anatomic Pathology (1991)


    • Johns Hopkins University School of Medicine / Transfusion Medicine (1996)


    • American Board of Pathology / Anatomic & Clinical Pathology (1991)
    • American Board of Pathology / Blood Banking/Transfusion Medicine (1995)
  • Research & Publications +

    Research Summary

    Dr. King’s research focuses on two areas: 1) the problem of alloimmunization due to either multiple transfusions or fetal maternal incompatibility, and 2) novel indications for apheresis. Her interests involve the clinical complications related to red cell alloimmunization, specifically delayed hemolytic transfusion reactions and the phenomenon of bystander hemolysis. She is interested in the transfusion-related issues that complicate the course of patients with sickle cell disease, especially those issues due to alloimmunization and multiple transfusions.

    Selected Publications

    1. Garibaldi B, King KE, Jaffe JM, Moliterno AR. "Hypersplenism induced by splenic vein ligation." Am J Hematol. 2008 Mar;83(3):242-4.
    2. Tobian AAR, King KE, Ness PM. "Transfusion premedications: a growing practice not based on evidence." Transfusion. 2007;47:1089-1096.
    3. Haas M, Rahman MH, Racusen LC, Kraus ES, Bagnasco SM, Segev DL, Simpkins CE, Warren DS, King KE, Zachary AA, Montgomery RA. "C4d and C3d staining in biopsies of ABO- and HLA-incompatible renal allografts: correlation with histologic findings." Am J Transplant. 2006;6:1829-1840.
    4. Buetens O, Shirey RS, Goble-Lee M, Houp J, Zachary A, King KE, Ness PM. "Prevalence of HLA antibodies in transfused patients with and without red cell antibodies." Transfusion. 2006;46:754-756.
    5. Segev DL, Simpkins CE, Warren DS, King KE, Shirey RS, Maley WR, Melancon JK, Cooper M, Kozlowski T, Montgomery RA. "ABO incompatible high-titer renal transplantation without splenectomy or anti-CD20 treatment." Am J Transplant. 2005;5:2570-2575.
    6. Sukkar A, Mollura D, King KE, Spivak J, Hassoun PM, McDyer JF. "A case of pulmonary hypertension associated with a rare congenital hemolytic anemia." Clinical Pulmonary Medicine. 2005;12:319-322.
    7. King KE, Ness PM. "Treatment of autoimmune hemolytic anemia." Seminars in Hematology. 2005;42:131-136.
    8. King K, Vogelsang GB. "Graft versus host disease (GVHD): recent advances including the use of photopheresis." Curr Opin in Organ Transplant. 2005;10:51-58.
  • Academic Affiliations & Courses +

    Graduate Program Affiliation

    Pathology/Transfusion Medicine

    Courses and Syllabi

    Blood Bank/Transfusion Medicine (Course Director)

  • Activities & Honors +


    • AABB
    • American Society for Apheresis
    • American Society for Clinical Pathology
    • College of American Pathologist

    Professional Activities

    • Leadership Program for Women Faculty, Johns Hopkins University School of Medicine, 2011 - 2012
  • Videos & Media +
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