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Living with Macrothrombocytopenia with mitral valve insufficiency

A rare genetic bleeding condition with large, low-count platelets and a leaky heart valve.

Understanding Macrothrombocytopenia with mitral valve insufficiency

Macrothrombocytopenia with mitral valve insufficiency is a rare bleeding disorder caused by a platelet problem, along with a leaky mitral heart valve.

Platelets are large and do not work well, and the count is moderately low. GARD describes mild bleeding problems, such as bruises and nosebleeds, and a longer bleeding time. It is linked with mitral valve insufficiency, where a heart valve does not close fully. It is described in childhood.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet, but its summary describes these:

  • Large platelets that do not work well
  • Moderately low platelet count
  • Easy bruising
  • Nosebleeds
  • Longer bleeding time
  • Leaky mitral heart valve

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 Platelet Disorder Support Association and other patient organizations
  • 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
How can we monitor the heart valve over time?
What should we do if there is bleeding or before surgery?
Is genetic testing available for this condition?

Quick facts

Symptoms usually startChild

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

GeneticBlood

Patient organizations

Source: NIH GARD · Macrothrombocytopenia with mitral valve insufficiencyGARD ID 20538 · 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 Macrothrombocytopenia with mitral valve insufficiency.

Explore the Macrothrombocytopenia with mitral valve insufficiency blog

Explore research for Macrothrombocytopenia with mitral valve insufficiency

Explore actively recruiting Macrothrombocytopenia with mitral valve insufficiency studies with HealthSpark.

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  • Eligibility is confirmed by the study team

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