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Living with Medich giant platelet syndrome

A blood condition with a low count of unusually large platelets, causing easy bleeding.

Understanding Medich giant platelet syndrome

Medich giant platelet syndrome is a platelet disorder that causes a low platelet count with giant platelets and easy bleeding.

Platelets are blood cells that help blood clot. In this condition they are large and low in number. It starts in newborns and infants.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet, but its summary describes easy bleeding.

  • Easy bleeding
  • Low platelet count
  • Giant platelets

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include blood and bone marrow specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Blood and bone marrow specialists (hematologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What should we do if bleeding happens or before surgery?
Is genetic testing available?
Which specialist, such as a hematologist, should follow this?

Quick facts

Symptoms usually startNewborn and as an Infant

Changes in genes (also called variants) cause this condition. GARD does not name a specific gene.

GeneticBlood

Also known as: medich macrothrombocytopenia

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Medich giant platelet syndromeGARD ID 21598 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Medich giant platelet syndrome.

Explore the Medich giant platelet syndrome blog

Explore research for Medich giant platelet syndrome

Explore actively recruiting Medich giant platelet syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Medich giant platelet syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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