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Living with Thrombophilia due to protein C deficiency, autosomal recessive

An inherited clotting condition in which too little protein C makes blood clots more likely.

Understanding Thrombophilia due to protein C deficiency, autosomal recessive

Thrombophilia due to protein C deficiency, autosomal recessive, is an inherited blood clotting disorder with a serious shortage of protein C.

It can be very severe, with newborn skin bleeding (neonatal purpura fulminans) or clots in the brain. It can also be milder, with clots in the veins (venous thromboembolism) starting in childhood, the teen years, or adulthood.

Signs & symptoms

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

  • Repeated deep vein blood clots
  • Blood clot in the lungs (pulmonary embolism)
  • Low protein C activity
  • Red or purple skin spots (purpura)
  • Seizures
  • Developmental delay

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

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

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

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
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 National Blood Clot Alliance
  • 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 PROC gene confirm this diagnosis?
Which specialists, such as a hematologist, should be on my care team?
What warning signs of a clot should we watch for?

Quick facts

InheritanceAutosomal Recessive

This condition is caused by changes in the PROC gene. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

Also known as: proc deficiency, autosomal recessive; protein c deficiency, autosomal recessive; thrombophilia 3 due to protein c deficiency, autosomal recessive

Patient organizations

Source: NIH GARD · Thrombophilia due to protein C deficiency, autosomal recessiveGARD ID 13041 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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