Journey Overview
Complement 3 glomerulopathy (C3G) and primary immune complex-mediated membranoproliferative glomerulonephritis (primary IC-MPGN) are rare kidney diseases. While separate conditions, both C3G and primary IC-MPGN overlap in underlying causes, symptoms, complications, and treatment. Both are related to abnormal immune system activity, and both cause inflammation and damage to the glomeruli, delicate filtering units inside the kidneys. As glomeruli become damaged, the kidneys lose function. If you or a loved one is living with C3G or primary IC-MPGN, this guide provides information to help you better understand the healthcare providers that you will work with, the questions you should be asking at appointments, and how these rare kidney diseases can be managed.
Your Comprehensive Care Team
People who are living with C3G or primary IC-MPGN will work with a team of healthcare providers with different specialties. This team can include:
C3G Treatment Options
- Treatment will depend on the diagnosis, but treatments for C3G and primary IC-MPGN can overlap.
- Medications to control blood pressure, reduce protein in the urine, and lower cholesterol can help slow the progression of kidney damage.
- Treatment can include drugs that act on the immune system, such as complement inhibitors and corticosteroids.
- Changes to diet and other lifestyle modifications may be recommended.
- If kidney failure occurs, it will need to be treated with dialysis and/or kidney transplantation.
C3G and IC-MPGN are rare diseases, and it’s important to work with healthcare providers who are experienced in treating rare kidney diseases. It’s also important to learn as much as you can about your diagnosis, your kidneys, and the medications you are taking.
The Conversation: Questions for Your Healthcare Team
Good communication with your healthcare team will help you get the most from treatment. Keep a symptom journal. Prepare for your appointments by writing down a list of questions and topics you want to cover. These questions can help you get started:
What are the most important things for me to know about my diagnosis? Where can I learn more about my diagnosis?
What do these numbers mean and why are they important to my kidneys?
- Glomerular filtration rate (GFR)
- Urine albumin level
- Blood pressure
Ask your provider to explain the results of any tests, including:
- Blood tests
- Urine tests
- Kidney biopsy
- Genetic testing
What treatment do you currently recommend? Ask these questions for every therapy you are prescribed.
- Why do you recommend this treatment?
- How does this treatment work?
- What is the goal of this treatment?
- How long will I be on this treatment?
- What are the potential side effects?
What can I do to prevent damage to my kidneys?
- What things should I limit, avoid, or change?
- Where can I learn more about how to care for my kidneys?
What new symptoms, changes in symptoms, and complications do I need to watch for?
- When do I need to call you?
- When do I need to seek emergency care?
Are there other healthcare providers I should be working with?
Will you communicate with my other healthcare providers? Ask what you can do to make sure your primary care provider and any specialists you are seeing are up to date on your current diagnosis and treatment.
Who can I talk to if I have concerns about the cost of treatment?
Your appointment is an opportunity to learn more about your diagnosis. If you have a question, ask. If something isn’t clear, ask for an explanation.
More Information for Patients and Caregivers
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C3 glomerulopathy: A guide to the kidneysAn overview of how the kidneys work and how C3 glomerulopathy causes a loss of kidney function.
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What are the complications of IC-MPGN?For anyone living with IC-MPGN, preventing these complications will be an important goal of treatment.
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C3G and IC-MPGN: Understanding the complement systemC3G and IC-MPGN are complement-mediated renal diseases, kidney diseases caused by problems with the complement syst...



