CHOC Docs :: Provider Profile

Loan B Hsieh, MD




Board Certified:
Pediatrics, Pediatric Hematology/Oncology

Research Focus:
Hematology with an emphasis in Factor XIII deficiency, chronic thrombocytopenia


Dr. Hsieh is on staff at CHOC Children's Hospital

CHOC Children's Clinic
1201 W. La Veta Ave.
Building: CHOC Clinic
Orange, CA 92868
phone: 888-770-2462
fax: 855-246-2329
map & directions

CHOC Children’s Specialty Center - Newport Beach
500 Superior Ave.
Suite 140
Newport Beach, CA 92663
map & directions

St. Joseph Hospital
1100 W Stewart Dr
Orange, CA 92868
map & directions

Physician / Researcher Bio

Loan Hsieh, M.D., is an attending pediatric hematology physician and director of ambulatory care for the hematology department at CHOC Children’s. She earned her medical degree from the Medical College of Virginia and completed her fellowship in pediatric hematology/oncology and her residency in pediatrics at CHOC. She is board certified in pediatrics and pediatric hematology/oncology. Dr. Hsieh is fluent in Vietnamese.

Administrative Appointments

  • Hematology, CHOC Children's Specialists

Academic Appointments

  • Assistant Clinical Professor
    University of California, Irvine, School of Medicine


  • Medical School
    Medical College of Virginia
  • Pediatrics Residency
    Children's Hospital of Orange County, Orange, CA
  • Pediatric Hematology/Oncology Fellowship
    Children's Hospital of Orange County, Orange, CA


Dr. Hsieh specializes in all aspects of hematology with an emphasis in Factor XIII deficiency. She is currently involved in a clinical trial with patients with this deficiency. She is also very dedicated to researching and treating chronic thrombocytopenia.

Board Certifications

  • Pediatrics
    American Board of Pediatrics
  • Pediatric Hematology/Oncology
    American Board of Pediatrics

Professional Organizations

  • American Society of Hematology
  • American Society of Pediatric Hematology Oncology

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UC Irvine

CHOC Children's is affiliated with the UC Irvine School of Medicine