How can one know if lupus is damaging the kidneys?

Question

Hello doctor,

I was diagnosed with lupus two years ago, and now my doctor thinks I may have lupus nephritis. My recent urine test showed protein and blood, and I have noticed some swelling in my ankles. I am worried about kidney damage.

Will I need a biopsy to confirm this if I have lupus nephritis?
What symptoms should I look for that mean my kidneys are getting worse?
Are immunosuppressants the only option, and how long will I take them?
Can this be reversed or only managed?

Please suggest.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I have read your query and can understand your concern. Lupus nephritis (LN) can be scary, but early intervention can make a big difference.

Symptoms of worsening kidney function

Watch for increased swelling on the legs, face, and hands, sudden, foamy urine (excess protein) or dark urine (blood), high blood pressure (new or worsening), fatigue or nausea (signs of rising creatinine or waste buildup), and reduced urine output (concerning for advanced damage).

Will you need a kidney biopsy?

A renal biopsy (usually ultrasound-guided) is the gold standard to confirm lupus nephritis (LN) and determine the class (I to VI, with III or IV being the most aggressive). The laboratory red flags are rising creatinine or eGFR (estimated glomerular filtration rate) decline (kidney function), proteinuria more than one gram per day or sudden spikes, and hematuria (RBCs (red blood cells) in urine, especially if dysmorphic).

Treatment:

Immunosuppressants are the first-line options, which vary by biopsy class. The other options are biologics like Belimumab (Benlysta) or Voclosporin (Lupkynis) for refractory cases.

Can lupus nephritis be reversed?

Early, aggressive treatment can often preserve or improve kidney function.

Monitoring and lifestyle factors

Laboratory tests like

Urine protein.
Creatinine.
Complements.
Anti-dsDNA (anti-double-stranded DNA antibodies) can be done every one to three months.

Lifestyle factors and considerations:

BP (blood pressure) checks have to be done at home (The goal should be less than 130/80mmHg).
In the case of diet, low salt and moderate protein can be taken.
Avoid NSAIDs (non-steroidal anti-inflammatory drugs).

Starting treatment soon is the key to protecting your kidneys. While immunosuppressants are the backbone of therapy, newer options like biologics help in improving outcomes.

I hope this answers your query.

Let me know if I need to assist you further.

Thank you.