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Living with 4-hydroxyphenylacetic aciduria

A rare metabolic condition found by higher than normal levels of a certain acid in the urine.

Understanding 4-hydroxyphenylacetic aciduria

4-hydroxyphenylacetic aciduria is a rare metabolic condition with higher than normal levels of 4-hydroxyphenylacetic acid in the urine.

GARD defines this condition by the raised level of this substance in the urine. GARD does not currently list other features, an onset age, or an inheritance pattern.

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
What does a high level of this acid in the urine mean for me?
Which tests can explain this finding?
Which specialist should follow up with us?

Quick facts

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

Also known as: elevated urine 4-hydroxyphenylacetic acid level

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · 4-hydroxyphenylacetic aciduriaGARD ID 8155 · 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 4-hydroxyphenylacetic aciduria.

Explore the 4-hydroxyphenylacetic aciduria blog

Explore research for 4-hydroxyphenylacetic aciduria

Explore actively recruiting 4-hydroxyphenylacetic aciduria studies with HealthSpark.

HealthSpark

Find actively recruiting studies for 4-hydroxyphenylacetic aciduria 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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