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Living with Hereditary pulmonary alveolar proteinosis

A rare lung condition present from birth in which a fat-and-protein substance builds up in the air sacs and makes breathing hard.

Understanding Hereditary pulmonary alveolar proteinosis

Hereditary pulmonary alveolar proteinosis is a rare lung condition in which surfactant, a substance of fat and protein, builds up in the air sacs of the lungs.

It is a form of breathing failure that is present from birth, though it can show at a variety of ages. The buildup makes breathing difficult. Diagnosis is based on symptoms, imaging, and genetic testing.

Signs & symptoms

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

  • Trouble breathing
  • Low blood oxygen
  • Slow weight gain in infancy
  • Need for breathing support (ventilation)
  • Cough, less often
  • Lung infection, less often

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 allergy and immune system specialists, genetic specialists and lung and breathing 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

    Children's Interstitial Lung Disease Foundation, The PAP Foundation and Immune Deficiency Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Allergy and immune system specialists (allergists / immunologists); Genetic specialists (geneticists); Lung and breathing specialists (pulmonologists)
Expert care
Expert lists: Children's Interstitial Lung Disease Foundation, The PAP Foundation, Immune Deficiency Foundation
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 Children's Interstitial Lung Disease Foundation 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
Which gene is involved in my or my child's condition?
What breathing support options exist?
Should family members have genetic testing?

Quick facts

Symptoms usually starta variety of ages
InheritanceAutosomal Recessive

It is caused by changes in one of several genes, such as ABCA3, CSF2RB, SFTPB, SFTPC, or CSF2RA. Depending on the gene, it is autosomal recessive, autosomal dominant, or X-linked recessive.

GeneticRespiratory

Also known as: congenital pap; congenital pulmonary alveolar proteinosis; genetic disorder of surfactant dysfunction; inborn error of pulmonary surfactant metabolism; inborn error of surfactant metabolism; pulmonary surfactant metabolism dysfunction

Patient organizations

Source: NIH GARD · Hereditary pulmonary alveolar proteinosisGARD ID 4582 · 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 Hereditary pulmonary alveolar proteinosis.

Explore the Hereditary pulmonary alveolar proteinosis blog

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Explore actively recruiting Hereditary pulmonary alveolar proteinosis studies with HealthSpark.

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