ITP Natural History Study Patient Registry

The ITP Natural History Study Registry is an international patient-consented registry of adults and children with ITP. The registry aims to collect, store and retrieve data on the natural progression of ITP, enabling collection of data on diagnosis and treatment, management of care, quality of life, clinician reporting, and characterization of the ITP population as a whole. The registry is administered by PDSA and overseen by the National Organization for Rare Disorders (NORD) and a committee of leading hematologists, ITP patients, and caregivers. Registry questionnaires were built from common data element standards:

  1. Participant Profile

    Country, race, insurance, education, employment
  2. Medical and Diagnostic Data

    Diagnostic tests, clinical visits, family history, and pregnancy/childbirth.
  3. Treatment and Review of Systems

    Types of medications and frequencies/dosage, diet, surgeries
    Disease progression:
     Q: “Rate function over the preceding 4 week period: Vision with usual glasses or contact lenses”
    Research history:
     Q: “Is the Participant willing to be contacted in the future about research related to his/her rare disease?
     Q: “Does the Participant currently participate in any clinical trials related to his/her rare disease?”
  4. Quality of Life

    Enjoyment of life, fatigue, sleep, pain, social activities, mental health, physical health
     Q: “In the past 7 days, the Participant felt anxious... Never/Rarely/Sometimes/Often/Always”
     Q: “In the past 7 days, the Participant could do sports and exercise that other kids his/her age could do … With no trouble/With a lot of trouble/Not able to do”
     Q: “In the past 7 days, the Participant worried about what could happen to him/her … Never/Rarely/Sometimes/Often/Always”

ITP Registry by the Numbers

  • Official Launch Date: Rare Disease Day, February 28, 2017
  • Patients Enrolled within 2 hours of launch: 100
  • Patients Enrolled within 24 hours of launch: 226
  • Patients Enrolled within first month: 337
  • Participants Enrolled as of March 16, 2020: 1,042
  • The Number of Active Participants (who have consented) as of March 16, 2020: 904
  • Participants with Surveys Complete: 510

Access to the ITP NHS Registry data is contingent upon project approval by PDSA’s ITP Registry Advisory Board. Contact PDSA Research Program Manager, Jennifer DiRaimo at with any questions. Registry was last updated March 16, 2020. New England IRB (NEIRB)


Learn how the ITP Natural History Study Registry can help further your valuable research, learn more about PDSA’s research opportunities, or contact PDSA at


Learn how your patients can enroll today in the ITP Natural History Study Registry! For more information or to request enrollment materials for your office, contact PDSA, 1.87.PLATELET (877.528.3538) or

Enrollee identities are protected in this secure, confidential HIPAA (Health Insurance Portability and Accountability Act) compliant registry, and there is no cost for participation.


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