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Living with Prekallikrein deficiency

A blood condition that usually causes no health problems and is often found by chance on a blood test.

Understanding Prekallikrein deficiency

Prekallikrein deficiency is a blood condition that usually causes no health problems.

Blood tests show a longer clotting time (prolonged PTT), which is usually linked to bleeding problems, but bleeding generally doesn't happen with this condition. It is usually found when blood tests are done for other reasons. A few people have had clotting-related problems, but these are common in the general population and most people have other risk factors, so it is unclear if they are related to the condition.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet.

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 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
Do I need any treatment or precautions before surgery or dental work?
Should my family members be tested?
Does this raise any risk for clots or bleeding in my case?

Quick facts

GARD doesn't describe a cause for this condition yet.

Also known as: fletcher factor deficiency; fletcher trait; pkk deficiency

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Prekallikrein deficiencyGARD ID 25905 · 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 Prekallikrein deficiency.

Explore the Prekallikrein deficiency blog

Explore research for Prekallikrein deficiency

Explore actively recruiting Prekallikrein deficiency studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Prekallikrein deficiency 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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