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Living with Autosomal dominant macrothrombocytopenia

An inherited blood condition with low platelet counts and unusually large platelets.

Understanding Autosomal dominant macrothrombocytopenia

Autosomal dominant macrothrombocytopenia is an inherited blood condition with low platelets that are larger than usual.

Platelets help blood clot. The condition is present from birth and can be noticed at a variety of ages. Some people bruise easily or bleed longer after surgery or dental work.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Low platelet count (thrombocytopenia)
  • Unusually large platelets
  • Easy bruising
  • Nosebleeds
  • Long bleeding after surgery or dental work
  • Heavy bleeding during periods

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 precautions should I take before surgery or dental work?
Which medicines should I avoid because they affect bleeding?
Would genetic testing help my relatives?

Quick facts

Symptoms usually starta variety of ages
InheritanceAutosomal Dominant

GARD says changes in genes (also called variants) cause this condition. It is autosomal dominant, meaning one changed copy of the gene can be enough to cause it.

GeneticBlood

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Autosomal dominant macrothrombocytopeniaGARD ID 16965 · 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 Autosomal dominant macrothrombocytopenia.

Explore the Autosomal dominant macrothrombocytopenia blog

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Explore actively recruiting Autosomal dominant macrothrombocytopenia studies with HealthSpark.

HealthSpark

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  • Eligibility is confirmed by the study team

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