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Hemophilia clinical trials in Seattle, WA

6 studies for Hemophilia are looking for participants at sites in and around Seattle (within about 30 miles). Open a study to see who can join and how to contact the study team.

Recruiting for a study here? Feature it at the top of this page — $99 for 30 days →

Safety and Effectiveness of Giroctocogene Fitelparvovec or Fidanacogene Elaparvovec in Patients With Hemophilia A or B Respectively

RecruitingPhase 3
  • Washington Institute for Coagulation, Seattle
Ages 18 and older · Men · Updated Oct 2, 2026 · NCT05568719

A Clinical Study to Evaluate the Effects of NXT007 Compared to Emicizumab Prophylaxis in People With Hemophilia A

RecruitingPhase 3
  • Washington Center for Bleeding Disorders, Seattle
Ages 12 and older · All sexes · Updated Sep 4, 2026 · NCT07416604

ATHN Transcends: A Natural History Study of Non-Neoplastic Hematologic Disorders

RecruitingObservational study
  • Washington Center for Bleeding Disorders, Seattle
All ages · All sexes · Updated Aug 17, 2026 · NCT04398628

Open-Label Extension Study of Marstacimab in Hemophilia Participants With or Without Inhibitors

RecruitingPhase 3
  • Washington Institute for Coagulation d/b/a WACBD, Seattle
Ages 1 to 74 · Men · Updated Jul 1, 2026 · NCT05145127

Emicizumab for Severe Von Willebrand Disease (VWD) and VWD/Hemophilia A

RecruitingPhase 1
  • Washington Center for Bleeding Disorders, Seattle
Ages 0 to 90 · All sexes · Updated Apr 3, 2026 · NCT05500807

Hemophilia A Research Program

RecruitingObservational studyHealthy volunteers welcome
  • University of Washington, Seattle
All ages · All sexes · Updated Feb 17, 2026 · NCT07414511

About Hemophilia

Hemophilia is a rare disorder in which the blood does not clot normally. Usually hemophilia usually occurs in males and is inherited. Learn more.

More about Hemophilia on MedlinePlus

Hemophilia trials in other cities

Other studies in Seattle

From ClinicalTrials.gov, data retrieved Oct 5, 2026. Each study sets its own eligibility; the study team decides who can join.