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Living with Antiphospholipid syndrome

An autoimmune condition that raises the chance of blood clots and can cause pregnancy complications.

Understanding Antiphospholipid syndrome

Antiphospholipid syndrome is an autoimmune disorder that increases the tendency to form abnormal blood clots.

Clots (thromboses) can form in nearly any blood vessel and can block blood flow, including to the brain. Women with the syndrome are at higher risk of pregnancy complications such as preeclampsia, early delivery, or pregnancy loss. A clot or pregnancy complication is often the first sign. It usually appears in early to mid-adulthood but can begin at any age.

Signs & symptoms

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

  • Blood clots in arteries or veins
  • Stroke or mini stroke (transient ischemic attack)
  • Pregnancy complications, such as early birth
  • Lace-like purplish skin pattern (livedo reticularis)
  • Fatigue
  • High blood pressure

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 autoimmune and inflammatory disease specialists, blood and bone marrow specialists, maternal-fetal medicine specialists and women’s reproductive health specialists.

  3. Ask which tests can help

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

  4. Connect with expert centers

    APS Foundation of America, Inc., Autoimmune Association and Global Autoimmune Institute may keep lists of experts for this condition.

Care & treatment

Care team
autoimmune and inflammatory disease specialists (rheumatologists); Blood and bone marrow specialists (hematologists); Maternal-fetal medicine specialists (pregnancy-related); Women’s reproductive health specialists (obstetricians / gynecologists)
Expert care
Expert lists: APS Foundation of America, Inc., Autoimmune Association, Global Autoimmune Institute
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 APS Foundation of America, Inc. 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
What can be done to lower my chance of blood clots?
How should a pregnancy be planned and monitored?
Which symptoms should prompt me to contact my care team right away?

Quick facts

GARD says this is an autoimmune disorder, in which the immune system attacks the body's own tissues and organs. GARD doesn't describe a gene in this record.

BloodUrinary and Reproductive

Also known as: anticardiolipin syndrome; antiphospholipid antibody syndrome; apl - antiphospholipid syndrome; apls; aps - antiphospholipid syndrome; classic antiphospholipid syndrome

Patient organizations

Source: NIH GARD · Antiphospholipid syndromeGARD ID 5824 · 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 Antiphospholipid syndrome.

Explore the Antiphospholipid syndrome blog

Explore research for Antiphospholipid syndrome

Explore actively recruiting Antiphospholipid syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Antiphospholipid syndrome 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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