Severe breathlessness, reduced urine output or confusion needs emergency care now. Rapidly progressive glomerulonephritis can destroy kidney function within weeks and needs urgent immunosuppressive treatment. Also seek urgent care for swelling with breathlessness.
Inflammation of the kidney's filtering units, caused by the immune system attacking them. It covers many distinct diseases that share a mechanism, and the biopsy is what separates them.
Unlike diabetes or high blood pressure, several of these conditions respond to immunosuppressive treatment — and unlike those causes, some recur in a transplanted kidney. The specific diagnosis therefore matters more here than in almost any other kidney disease.
The glomeruli are the kidney's filtering units — roughly a million in each kidney. Glomerulonephritis means they are inflamed, generally because the immune system is depositing antibodies or immune complexes within them or attacking them directly.
It is not one disease. IgA nephropathy, the commonest form worldwide, involves deposits of IgA antibody and often presents with visible blood in the urine during a throat infection. Membranous nephropathy and focal segmental glomerulosclerosis typically cause heavy protein loss with swelling. Lupus nephritis occurs as part of systemic lupus. Post-infectious glomerulonephritis follows a streptococcal infection and usually recovers.
The presentations cluster into two patterns. Nephritic — blood in the urine, raised blood pressure, some protein loss, and falling kidney function. Or nephrotic — very heavy protein loss with swelling, low albumin and high cholesterol. Some conditions cause either.
The kidney biopsy is what distinguishes them, and it changes treatment completely. Some forms respond well to immunosuppressive medication; others do not and are managed with blood pressure control alone. Some recur in a transplanted kidney, which affects planning. Without a biopsy, treatment is guesswork.
A small group of these conditions destroy kidney function over days to weeks rather than years, and they are potentially reversible if treated urgently with immunosuppression. Warning signs are a creatinine rising rapidly over weeks, blood in the urine, and in some cases coughing blood. This needs urgent nephrology assessment and biopsy where you are, not an international journey. Waiting even a few weeks in this situation can be the difference between recovered kidneys and lifelong dialysis.
Blood and urine testing narrows it; the biopsy settles it.
Without it, nobody can tell you whether your condition will respond to treatment, whether it will recur after a transplant, or what your outlook is. If a biopsy has been done, send the full histology report including the immunofluorescence and electron microscopy findings. If it has not been done and your kidneys are not yet too shrunken, arranging one is usually the most valuable next step.
Treatment depends entirely on which condition the biopsy shows.
A drug blocking the renin-angiotensin system reduces protein loss and slows progression in essentially all forms. Rigorous blood pressure control, salt restriction and, increasingly, SGLT2 inhibitors form the background treatment on which everything else is added.
Steroids, and drugs such as cyclophosphamide, mycophenolate, calcineurin inhibitors or rituximab, chosen according to the specific diagnosis. Some conditions respond very well; others do not and would only be harmed by the side effects. This is precisely why the biopsy is essential before treatment.
High-dose steroids, cyclophosphamide or rituximab, and sometimes plasma exchange, started urgently where kidney function is falling over weeks. Delay costs nephrons that do not come back. This treatment is started where the patient is, not after travel.
Transplant works well, but several of these conditions can recur in the transplanted kidney — FSGS most notably, and IgA nephropathy commonly though often mildly. Knowing the original diagnosis allows monitoring for recurrence and, in some cases, preventive strategies. It also affects the choice of related donor in genetic forms.
Nothing else can be decided without it. These conditions look alike on blood tests and behave completely differently.
Rapid decline over weeks demands urgent immunosuppression locally. Slow decline over years allows planning.
Some forms recur and can damage a transplanted kidney. This should be discussed before transplant, not discovered afterwards.
If your kidneys are not yet shrunken and no biopsy has been done, arranging one is usually more valuable than anything else — including travelling.
Rapidly progressive glomerulonephritis is one of the few kidney emergencies where weeks of delay change the outcome permanently. Treat it locally and urgently.
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Because glomerulonephritis is a group of quite different diseases that look similar on blood and urine tests. The biopsy identifies which one you have, and that determines whether immunosuppressive treatment will help or merely harm you, what your outlook is, and whether the condition might recur in a transplanted kidney. Treating without it is guesswork.
For some conditions it can substantially change the course — lupus nephritis, vasculitis and membranous nephropathy among them. For others it offers little and exposes you to significant side effects. The biopsy diagnosis determines which applies. Where treatment is indicated, starting it early matters considerably.
It depends on the condition. Focal segmental glomerulosclerosis recurs in a meaningful proportion of transplants, sometimes quickly. IgA nephropathy recurs commonly but is often mild and slow. Membranous nephropathy can recur. Knowing your diagnosis allows monitoring and, in some cases, preventive measures — which is another reason the biopsy matters.
It varies enormously. Many people have mild disease that never progresses. Others lose function over decades. The predictors are the amount of protein in the urine, blood pressure control and the biopsy findings. Reducing protein loss with a renin-angiotensin blocking drug and controlling blood pressure rigorously are the mainstays, and newer treatments are emerging.
Very. A creatinine rising over weeks with blood in the urine suggests a rapidly progressive form, which can destroy kidney function permanently within a short time and is potentially reversible if treated urgently. This needs nephrology assessment and biopsy where you are, immediately — not an international journey.
He must be screened carefully first. Some forms of glomerular disease, particularly certain types of FSGS, have a genetic basis, and a donor carrying the same gene would be at risk himself. Where a familial pattern exists, genetic testing of the potential donor should be part of the assessment.
Send the kidney biopsy report in full — including immunofluorescence — along with your creatinine trend and urine protein. Without the biopsy, nobody can advise you properly.
Your reports go directly to our medical team. We do not share your records with hospitals until you tell us to.
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