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Rare kidney & urinary condition

C3 glomerulopathy

C3 glomerulopathy is a rare kidney disease caused by uncontrolled activation of the complement system - part of innate immunity - depositing C3 in the filters; it is a field where diagnosis and treatment are evolving fast.

Key points

The essentials at a glance.

What to look out for, how the diagnosis is confirmed, who looks after it, and the options that exist.

  • 01

    It is defined on biopsy by dominant C3 staining with characteristic deposits, and includes dense deposit disease and C3 glomerulonephritis.

  • 02

    The driver is overactivity of the alternative complement pathway - from gene variants or autoantibodies such as C3 nephritic factor.

  • 03

    Complement blood profiling and genetic testing are part of the standard work-up in specialist centres.

  • 04

    Supportive therapy plus mycophenolate and steroids are current first-line for progressive disease.

  • 05

    Complement-inhibiting drugs are in active trials with encouraging results - specialist or national-centre involvement is worthwhile. The disease can recur after transplantation.

Understanding it

What it is, and what happens next.

In plain English - what is going on, how specialists confirm it, and the routes to treatment in the UK.

Complement C3 sits at the centre of an ancient immune cascade that normally ticks over under tight control; in C3 glomerulopathy that control fails, and the kidney's filters bear the brunt of continuous complement attack. Presentations range from blood and protein in the urine to nephrotic syndrome and progressive failure, often in young people, and the historical outlook - roughly half reaching kidney failure within a decade - is precisely what new complement-targeted drugs aim to change.

Because the disease is rare and mechanistic, care benefits from specialist nephrology with access to complement diagnostics: functional assays, autoantibody testing and genetics map each patient's driver, immunosuppression is used judiciously for inflammatory disease, and eligible patients should hear about complement inhibitor trials - the first agents designed for the disease's actual mechanism. In many parts of the UK, routine NHS outpatient referrals for problems like this can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.

A quiet reminder

This guide is for information, not medical advice.

Your GP or specialist knows your history and can tell you which parts apply to you. If in doubt, speak to them.

Published 2026-09-27 · Next review 2027-09-27

Frequently asked

Common questions about C3 glomerulopathy.

Quick, plain-English answers to what people ask us most.

  • What is c3 glomerulopathy?

    C3 glomerulopathy is a recognised medical condition that can affect people in different ways, ranging from mild and easily managed to more significant, depending on the underlying cause, how early it is picked up, and how it is treated. Getting a clear diagnosis is usually the first step towards the right management plan.

  • What causes c3 glomerulopathy?

    C3 glomerulopathy can arise from a combination of factors, which may include genetics, lifestyle, environmental exposures, other underlying health conditions, or simply the normal effects of ageing on the body. In many cases no single cause is found, and several factors act together. A clinician can help identify which factors are most relevant in an individual case.

  • What are the symptoms of c3 glomerulopathy?

    Symptoms of c3 glomerulopathy vary from person to person and depend on how severe the condition is and which structures are affected. Some people notice symptoms gradually over weeks or months, while others experience a more sudden onset. Because symptoms can overlap with other conditions, a proper assessment is important to reach an accurate diagnosis rather than relying on symptoms alone.

  • Is c3 glomerulopathy serious or dangerous?

    Most cases of c3 glomerulopathy are manageable, especially when identified and treated early, but severity varies from mild and self-limiting to more significant, depending on individual circumstances. Left unassessed, some cases can lead to complications or a longer-term impact on daily life. If you are worried about your symptoms, it is always worth getting them checked rather than waiting.

  • Is c3 glomerulopathy hereditary or genetic?

    Some cases of c3 glomerulopathy have a genetic component and can run in families, while others occur without any family history at all. Having a relative with the condition may modestly increase your own risk, but it does not mean you will definitely develop it yourself. If you are concerned about a family history, mention this to your doctor, as it may occasionally influence screening or monitoring.

  • Can c3 glomerulopathy be cured, reversed or prevented?

    Outlook varies with c3 glomerulopathy: some cases resolve completely with treatment, others improve significantly but need ongoing management, and a smaller number become a long-term condition to be controlled rather than cured. Prevention strategies, such as addressing modifiable risk factors, can reduce your chances of developing it or of it recurring, but cannot guarantee against it in every case.

  • How is c3 glomerulopathy treated?

    Treatment for c3 glomerulopathy is tailored to the individual and depends on severity, underlying cause and personal circumstances. Options can range from simple lifestyle measures, monitoring and conservative treatment through to medication, specialist procedures or surgery in more significant cases. A specialist assessment helps identify which combination of treatments is most appropriate for you.

  • How long does c3 glomerulopathy last?

    The duration of c3 glomerulopathy varies considerably: some people recover within days or weeks, while others live with a more persistent or recurring condition that needs ongoing management. Response to treatment, how early it is started, and individual factors all influence the timescale. Your clinician can give you a more personalised estimate once your specific circumstances are known.

  • When is surgery needed for c3 glomerulopathy?

    Surgery is not usually the first option for c3 glomerulopathy and is generally reserved for cases where conservative treatment has not worked, symptoms are severe, or there is a significant structural problem that needs to be corrected directly. The decision depends on your specific findings, symptoms and how they are affecting your life. A specialist consultation is the best way to establish whether surgery is being considered too early, or should be considered sooner rather than later.

  • When should I see a doctor about c3 glomerulopathy, and how quickly can I be seen privately?

    It is worth seeing a doctor about c3 glomerulopathy if symptoms are persistent, getting worse, or affecting your daily life, rather than waiting to see if they settle on their own. NHS routine referrals to a specialist can currently take anywhere from around 20 to 45 weeks or more depending on your area, whereas a private consultant can typically see you within about 2 weeks. Getting an earlier assessment can help clarify the diagnosis and start the right treatment sooner.