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Living with Oligomeganephronia

A rare kidney condition in which the kidneys have far fewer nephrons (filtering units) than usual, and the ones present are enlarged.

Understanding Oligomeganephronia

Oligomeganephronia is a rare kidney malformation with 80% fewer nephrons than usual and enlarged filters and tubes.

Nephrons are the tiny filtering units of the kidney. In this condition the remaining glomeruli and tubules are much larger than normal. GARD lists reduced kidney function and small kidneys among its features. GARD lists onset as any time in life.

Signs & symptoms

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

  • Fewer nephrons than normal
  • Small kidneys on both sides
  • Reduced kidney function
  • Enlarged kidney filters (glomerulomegaly)
  • Premature birth or small size for gestational age
  • Kidney failure (renal insufficiency)

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 kidney specialists.

  3. Ask which tests can help

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

Care & treatment

Care team
Kidney specialists (nephrologists)
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 Kidney 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
How is my kidney function measured and how often?
What can protect the kidneys I have?
Which specialists, such as a kidney doctor (nephrologist), should I see?

Quick facts

Symptoms usually startany time in life

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

Kidney

Also known as: oligomeganephronic hypoplasia; oligomeganephronic hypoplasia of kidney; oligomeganephronic renal hypoplasia

Patient organizations

Source: NIH GARD · OligomeganephroniaGARD ID 4066 · 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 Oligomeganephronia.

Explore the Oligomeganephronia blog

Explore research for Oligomeganephronia

Explore actively recruiting Oligomeganephronia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Oligomeganephronia 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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