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Living with Thrombocytopenia 1

An inherited bleeding condition, mostly in males, with low and small platelets that makes people bruise easily.

Understanding Thrombocytopenia 1

Thrombocytopenia 1, also called X-linked thrombocytopenia, is a bleeding disorder that mainly affects males and involves too few platelets.

Platelets help blood clot, and in this condition they are also often small. People bruise easily or bleed for a long time after minor injury, and sometimes bleed without injury, including in the brain. Some also have eczema or get more infections. Some people have a milder form with normal platelet numbers at times (intermittent thrombocytopenia).

Signs & symptoms

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

  • Low platelet count from birth
  • Small platelets
  • Easy bruising
  • Nosebleeds
  • Tiny red or purple skin dots (petechiae)
  • Eczema

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. Consider genetic testing

    Changes in WAS are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

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
Can genetic testing of the WAS gene confirm this diagnosis?
How is this different from Wiskott-Aldrich syndrome?
What should we do about bleeding or injuries?

Quick facts

InheritanceX-Linked
GenesWAS

This condition is caused by changes in the WAS gene. It is X-linked, which means the gene is on the X chromosome.

GeneticBlood

Also known as: thrombocytopenia type 1; thrombocytopenia, x-linked, 1; thrombocytopenia, x-linked, intermittent, x-linked recessive; thrombocytopenia, x-linked, x-linked recessive; x-linked thrombocytopenia with normal platelets

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Thrombocytopenia 1GARD ID 5176 · 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 Thrombocytopenia 1.

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