C3 Glomerulopathy: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats C3 Glomerulopathy?
A nephrologist, a doctor who specializes in kidney diseases, usually treats C3 glomerulopathy. A primary care doctor often orders the first tests and then sends the patient to the specialist. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is C3 glomerulopathy?
C3 glomerulopathy is a rare disease that harms the tiny filters inside the kidneys. These filters are called glomeruli, and their job is to clean waste out of the blood. In this disease, a part of the immune system called complement protein C3 builds up in the filters and damages them. Over time, the kidneys may have trouble doing their job.
C3 glomerulopathy happens when the immune system, which normally fights germs, wrongly attacks the kidneys' tiny filters. A protein called C3 piles up in them, causing swelling and scarring.
Symptoms
Many people have no symptoms at first, so the disease is often found during a routine urine test. Symptoms can include pink, red, or cola colored urine, foamy urine, swelling, high blood pressure, and tiredness.
Causes and who gets it
The disease is linked to the complement system, blood proteins that help fight infection. In C3 glomerulopathy, this system becomes overactive and turns on the kidneys by mistake.
How doctors diagnose it
Doctors usually start with blood and urine tests. The most important test is a kidney biopsy, in which a tiny piece of kidney tissue is removed with a needle and examined. It shows where C3 has built up and helps rule out other kidney problems.
Treatment
There is no cure. Treatment aims to slow kidney damage and manage symptoms, often with medicines that lower blood pressure and reduce protein loss in the urine. Newer medicines that block the complement system are being studied. If the kidneys fail, dialysis or a transplant may be needed.
When to see a doctor
Anyone who notices pink, red, or cola colored urine, or swelling in the legs, face, or around the eyes, should see a doctor soon. Early checks matter because kidney damage can happen quietly over months or years.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either can order tests, check blood pressure, and watch kidney function between specialist visits, referring the patient to a nephrologist when needed.
Common questions
Is C3 glomerulopathy the same as kidney failure?
No. Some people keep working kidneys for many years, while others slowly lose kidney function. Regular testing helps doctors follow how the disease is going.
Can children get this disease?
Yes. It can start at any age, including in children. Kids are usually cared for by a special kind of nephrologist who treats children.
Is it inherited?
Most cases are not passed down from parents. A few families have gene changes that raise the risk, so doctors may ask about family history.
Will dialysis be needed?
Not always. Some people never need dialysis, which is a machine treatment that cleans the blood when kidneys fail. Others do, depending on how much damage develops over time.
Sources
- NIH Genetic and Rare Diseases Information Center - Complement 3 glomerulopathy
- MedlinePlus - Kidney Diseases
- National Kidney Foundation - Kidney Topics
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
