Lupus Nephritis
What is Lupus Nephritis?
Lupus nephritis is kidney inflammation caused by systemic lupus erythematosus, or SLE. Lupus is an autoimmune disease where your immune system attacks healthy tissue by mistake. When lupus attacks your kidneys, it causes inflammation that can damage the tiny filters in your kidneys called glomeruli.
Your kidneys filter waste and extra fluid from your blood to make urine. When lupus nephritis damages your kidney filters, protein and blood can leak into your urine. Over time, this damage can reduce how well your kidneys work. About 40 percent of people with lupus will develop kidney involvement at some point.
Early detection and treatment are critical for protecting your kidneys. Regular blood and urine testing helps catch kidney problems before they become serious. With proper care, many people with lupus nephritis can prevent permanent kidney damage and maintain good kidney function.
Symptoms
- Swelling in your legs, ankles, feet, or around your eyes
- Foamy or bubbly urine caused by protein leaking into urine
- High blood pressure or worsening blood pressure control
- Weight gain from fluid retention
- Decreased urine output or changes in urination
- Dark or cola-colored urine from blood in the urine
- Fatigue and low energy levels
- Joint pain or muscle aches
Many people with early lupus nephritis have no symptoms at all. Kidney damage can be happening silently before you notice any changes. This is why regular testing is so important if you have lupus.
Concerned about Lupus Nephritis? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Lupus nephritis develops when your immune system creates antibodies that attack your own kidney tissue. These antibodies form immune complexes that get stuck in the kidney filters. This triggers inflammation that damages the delicate filtering structures. Researchers do not fully understand why lupus develops, but genetics and environmental factors both play a role.
Risk factors include having systemic lupus erythematosus, being female, being of African, Hispanic, or Asian descent, and developing lupus at a young age. Lupus flares can be triggered by sunlight, infections, certain medications, and stress. Once you have lupus, kidney involvement can occur at any time. Some people develop kidney problems when they are first diagnosed with lupus, while others develop it years later.
How it's diagnosed
Lupus nephritis is diagnosed through urine tests, blood tests, and sometimes a kidney biopsy. Urine tests check for protein and blood in your urine, which are key signs of kidney damage. Blood tests measure creatinine levels, which show how well your kidneys are filtering waste. High creatinine means your kidney function is declining. Tests also measure albumin in your urine, which rises when kidney filters are damaged.
Rite Aid offers testing that includes creatinine, urine albumin, and urine protein to help monitor kidney health. Regular testing helps detect kidney problems early and track how well treatment is working. Your doctor may also order a kidney biopsy to see exactly how much damage has occurred and what type of lupus nephritis you have. This helps guide treatment decisions.
Treatment options
- Immunosuppressive medications like corticosteroids to reduce immune system activity
- Medications such as mycophenolate mofetil or cyclophosphamide to prevent kidney damage
- Blood pressure medications, especially ACE inhibitors or ARBs, to protect kidneys
- Hydroxychloroquine to help control lupus activity
- Low-sodium diet to reduce swelling and control blood pressure
- Limiting protein intake if kidney function is declining
- Staying hydrated and avoiding medications that can harm kidneys
- Avoiding triggers like excessive sun exposure and managing stress
- Regular monitoring with blood and urine tests to catch flares early
Concerned about Lupus Nephritis? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Lupus is an autoimmune disease that can affect many parts of your body. Lupus nephritis is a specific complication where lupus attacks your kidneys. Not everyone with lupus develops kidney involvement, but about 40 percent do. Regular testing helps catch kidney problems early.
Lupus nephritis cannot be cured, but it can be managed with treatment. Early and aggressive treatment can put the disease into remission and prevent permanent kidney damage. Many people with lupus nephritis maintain good kidney function with proper medication and monitoring. The goal is to control inflammation and protect your kidneys long term.
If you have lupus, you should get urine and blood tests at least every 3 to 6 months. More frequent testing may be needed if you have active disease or are starting new treatment. Regular monitoring helps catch kidney involvement early before serious damage occurs. Your doctor will create a testing schedule based on your individual needs.
Protein in your urine, called proteinuria, means your kidney filters are damaged and leaking protein. Healthy kidneys keep protein in your blood and do not let it pass into urine. High levels of protein in urine are a key sign of lupus nephritis. This requires treatment to prevent further kidney damage.
Diet can support kidney health but cannot replace medical treatment. A low-sodium diet helps control blood pressure and reduce swelling. Some people may need to limit protein if kidney function is declining. Staying well hydrated and avoiding processed foods can also help. Work with a dietitian who understands kidney disease.
Untreated lupus nephritis can lead to permanent kidney damage and kidney failure. This may require dialysis or a kidney transplant. Early treatment is critical to prevent irreversible damage. Most people who get proper treatment can avoid these serious complications.
Lupus nephritis itself usually does not cause pain. Most kidney damage happens silently without obvious symptoms. Some people may have back pain, but this is not common. The main symptoms are swelling, changes in urination, and fatigue. This is why testing is so important even when you feel fine.
Yes, kidney involvement can sometimes be the first sign of lupus. Some people are diagnosed with lupus only after tests reveal kidney problems. However, most people with lupus nephritis have other lupus symptoms like joint pain, rashes, or fatigue. Your doctor will look at the full picture when making a diagnosis.
Creatinine is a waste product that your kidneys normally filter from your blood. When your kidneys are damaged, creatinine builds up in your blood. High creatinine levels mean your kidney function is declining. Serial creatinine testing helps track kidney health and guides treatment decisions.
Pregnancy can be risky if you have active lupus nephritis. It can worsen kidney function and increase the risk of complications for both mother and baby. If you want to become pregnant, work closely with your doctors to get your disease into remission first. Careful monitoring throughout pregnancy is essential.