What is Lupus Nephritis?
Lupus nephritis is inflammation of the kidneys caused by lupus. It affects a substantial proportion of patients — more in South Asian populations — and it is usually silent in its early stages, which is why urine is checked at every lupus review. Treated early, kidney function is usually preserved.
Also called: Lupus kidney disease
Who gets Lupus Nephritis?
Up to half of people with systemic lupus erythematosus develop kidney involvement, most often within the first five years of diagnosis. It is more common and tends to be more severe in South Asian, African and Hispanic patients, and in men and younger patients with lupus. High anti-dsDNA levels and low complement raise the likelihood.
What are the symptoms of Lupus Nephritis?
Not everyone has every symptom below, and having one does not confirm the diagnosis. These are the features that most often lead to assessment:
- Often none at all in the early stages — which is why urine is tested at every visit
- Foamy or frothy urine from protein loss
- Swelling of the ankles, legs, hands or around the eyes
- Weight gain from fluid retention
- Blood in the urine, sometimes visible but usually detectable only on testing
- New or worsening high blood pressure
- Reduced urine output in severe disease
- Fatigue and nausea when kidney function is significantly reduced
How is Lupus Nephritis diagnosed?
Urine testing is the screening tool: protein, blood and cellular casts. A urine protein-creatinine ratio quantifies the protein loss.
Blood tests assess kidney function, complement levels and anti-dsDNA.
A kidney biopsy is usually necessary once significant protein is found. It is the only way to determine the class of lupus nephritis, and the class determines the treatment — some classes need aggressive immunosuppression and others do not. It also shows how much of the damage is active inflammation, which can be reversed, and how much is scarring, which cannot.
How is Lupus Nephritis treated?
Treatment has an intensive induction phase followed by a longer maintenance phase.
Induction typically combines corticosteroids with mycophenolate or cyclophosphamide. Newer agents — belimumab and voclosporin — are added in some regimens and improve remission rates.
Maintenance continues with mycophenolate or azathioprine at lower doses, usually for at least three years, because stopping early is a common cause of relapse.
Alongside immunosuppression, blood pressure control with an ACE inhibitor or ARB reduces protein loss and protects the kidney independently, and hydroxychloroquine is continued throughout.
Living with Lupus Nephritis
With treatment, most patients preserve kidney function long-term. Regular urine and blood monitoring continues indefinitely, since relapse is possible years later. Blood pressure, salt intake, cholesterol and avoidance of anti-inflammatory painkillers all matter. Pregnancy should be planned for a period of sustained remission, as active nephritis carries significant risk to mother and baby.
When should you see a rheumatologist?
Anyone with lupus who develops foamy urine, ankle or facial swelling, or a rise in blood pressure should be reviewed promptly. Anyone diagnosed with lupus should have urine tested at every visit even when entirely well.
Common questions about Lupus Nephritis
Why do I need a kidney biopsy?
Because the class of lupus nephritis determines the treatment, and blood and urine tests cannot show the class. The biopsy also shows how much is active inflammation, which treatment can reverse, versus scarring, which it cannot.
Can lupus nephritis be cured?
It can go into complete remission, and with treatment most patients preserve normal kidney function. Relapse is possible, so monitoring and maintenance treatment continue for years after remission is achieved.
I feel completely fine — can my kidneys still be affected?
Yes. Early lupus nephritis usually causes no symptoms at all. That is precisely why urine is tested at every lupus review, regardless of how well you feel.
Will I need dialysis?
Most patients treated in time do not. The risk rises with delayed diagnosis, incomplete treatment and repeated relapses, which is why early detection and completing the full course of maintenance therapy matter so much.
This page is general information to support a consultation. It is not a diagnosis, and it does not replace an assessment by a doctor who has examined you.