Condition Deep-Dives 10 min read·Updated 22 July 2026 Clinician-reviewed

Nephrotic Syndrome

A UK Consultant Nephrologist's overview of nephrotic syndrome — a recognisable pattern of glomerular injury that always needs urgent investigation and almost always needs a kidney biopsy in adults.

  • Clinically Reviewed
  • NHS & NICE Aligned
  • UK Evidence-Based
  • Last Reviewed 22 July 2026

Professor Mohammed Mahdi Althaf

Consultant Nephrologist & Acute Physician

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Professor Mohammed Mahdi Althaf

MD, MSc, PgDip (Clin Ed), FRCP, FHEA, FASN

Consultant Nephrologist & Acute Physician · GMC 7216325

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Direct answer

Nephrotic syndrome = heavy proteinuria + low albumin + oedema + high cholesterol. The biopsy diagnosis determines treatment. Anticoagulate if albumin <20 g/L. All patients need an ACE/ARB, statin and salt restriction.

Key recommendation: Define by proteinuria >3.5 g/day, albumin <30 g/L, oedema.

Quick answer

✓ Best choices

  • Plant proteins: beans, lentils, tofu, tempeh, chickpeas
  • Vegetables, fruit and whole grains
  • Oily fish 1–2 times a week
  • Olive oil as the main cooking fat

✓ Foods to limit

  • Added salt (≤ 6 g/day)
  • Processed meats and high-additive ready meals
  • Excess animal protein at every meal

Key takeaway

Nephrotic syndrome = heavy proteinuria + low albumin + oedema + high cholesterol. The biopsy diagnosis determines treatment. Anticoagulate if albumin <20 g/L. All patients need an ACE/ARB, statin and salt restriction.

Who should be cautious

People on dialysis, post-transplant, pregnant or breastfeeding, or taking prescription medication — confirm with your renal team before changes.

Nephrotic Syndrome

Clinical features

Presentation

  • Oedema — typically pitting, dependent (ankles), facial puffiness on waking, may progress to ascites, pleural effusion, anasarca
  • Frothy urine (proteinuria)
  • Weight gain
  • Fatigue
  • Sometimes blood clots present (calf swelling, breathlessness)
  • Xanthelasma (lipid deposits)

Laboratory Diagnosis

  • 24-hour urine protein >3.5 g (or urine PCR >300, ACR >250)
  • Serum albumin <30 g/L
  • Hypercholesterolaemia
  • Often normal eGFR initially
  • Bland sediment (a few cells, no significant haematuria) — if heavy haematuria, suspect nephritic overlap

Work-up

  • Bloods: U&E, LFT, lipids, ANA/dsDNA, ANCA, complement (C3, C4), serum free light chains, protein electrophoresis, hep B/C, HIV, anti-PLA2R
  • Urine: ACR, PCR, microscopy, BJP
  • Imaging: USS kidneys + bladder
  • KIDNEY BIOPSY — almost always in adults; not always in children (MCD presumed)

Causes by biopsy diagnosis

Primary

  • Minimal change disease — children mostly; ~10% adults
  • FSGS — both primary and APOL1-associated
  • Membranous nephropathy — anti-PLA2R+ in ~70% primary; commonest adult nephrotic
  • IgA nephropathy — usually nephritic, can be nephrotic
  • Membranoproliferative glomerulonephritis (MPGN)

Secondary

  • Diabetes (commonest overall in adults)
  • Lupus (class V membranous lupus nephritis)
  • Amyloidosis (AL, AA)
  • Light chain deposition disease
  • Hepatitis B → membranous
  • Hepatitis C → MPGN, cryoglobulinaemia
  • HIV → collapsing FSGS
  • Drugs: NSAIDs (minimal change), gold/penicillamine (membranous), bisphosphonates (FSGS), lithium
  • Solid tumours (membranous as paraneoplastic; >65 yrs — screen)
  • Lymphoma → minimal change
  • Pre-eclampsia (in pregnancy)

Kidney Vitality is a daily multivitamin developed by a UK Consultant Nephrologist using renal nutrition principles. It contains no added potassium, magnesium, phosphorus or iron, and no herbal blends. See the formulation.

Treatment — general principles

SUPPORTIVE (all patients):

  • Salt restriction <5 g/day
  • Fluid restriction 1-1.5 L/day if severe oedema
  • Loop diuretic (furosemide 40-80 mg, may need 250 mg IV or torasemide; can be poorly absorbed PO due to gut oedema)
  • Daily weights; aim for 0.5-1 kg/day loss; avoid AKI from over-diuresis
  • ACE inhibitor or ARB — reduces proteinuria 30-40%
  • Statin (atorvastatin 20-40 mg) — high CV risk
  • Pneumococcal vaccine; consider penicillin V prophylaxis in children
  • Vitamin D replacement (urinary loss)

Anticoagulation

  • Indicated when albumin <20 g/L (especially membranous)
  • Warfarin (target INR 2-3) or apixaban/rivaroxaban
  • Continue until albumin >30 g/L sustained

Cause-specific Treatment

  • Minimal change disease — prednisolone 1 mg/kg, 12-16 weeks
  • FSGS — prednisolone 1 mg/kg, longer course; CNI if no response
  • Membranous — rituximab first-line (MENTOR/STARMEN); 'wait and watch' if low-risk
  • Lupus nephritis — MMF + steroids ± rituximab/belimumab
  • Amyloidosis — chemotherapy for AL; treat underlying inflammation for AA
  • Diabetic — RAS blockade + SGLT2i + finerenone

Monitoring and complications

Remission Definitions

  • Complete: ACR <30, albumin normal
  • Partial: >50% reduction in proteinuria, ACR <300
  • Relapse: ACR rises >300 + recurrence of oedema

Follow-up

  • Weekly ACR + bloods during active disease
  • Monitor for steroid side effects
  • Bone protection (calcium + vitamin D + bisphosphonate if long-term steroid)
  • PPI cover during steroids
  • PCP prophylaxis if heavy immunosuppression

Long-term

  • Cardiovascular risk: statin, BP control, smoking, weight, exercise
  • Pregnancy planning — pre-eclampsia + relapse risk; refer to obstetric nephrology
  • Vaccinations: annual flu, pneumococcal, COVID boosters; live vaccines contraindicated on immunosuppression
  • Long-term nephrology follow-up — relapse risk persists for years
Minimal Change Disease
Related reading: Minimal Change Disease.

Key practical tips

Designed for quick scanning — what to order, what to avoid, sensible portions, common mistakes.

  • Take prescribed ACE inhibitor / ARB / SGLT2 inhibitor consistently — diet works alongside, not instead
  • Monitor BP at home weekly
  • Review urine ACR with your team to track progress

Clinical guidance

TL;DR summary

Nephrotic syndrome = heavy proteinuria + low albumin + oedema + high cholesterol. The biopsy diagnosis determines treatment. Anticoagulate if albumin <20 g/L. All patients need an ACE/ARB, statin and salt restriction.

Key takeaways
  • Define by proteinuria >3.5 g/day, albumin <30 g/L, oedema.
  • Biopsy essential in adults — diagnosis drives treatment.
  • Anticoagulate if albumin <20 g/L (high VTE risk).
  • Salt restriction + loop diuretic for oedema.
  • Watch for AKI from over-diuresis.
Kidney Diet & Nutrition Considerations

When protein is leaking into the urine, the goal is to protect the remaining kidney function. Dietary protein should be sensible — neither very high nor unnecessarily low — and a Mediterranean-style plate with reduced salt supports both blood pressure and albuminuria reduction alongside ACE inhibitors, ARBs or SGLT2 inhibitors.

Foods to prioritise

  • Plant proteins: beans, lentils, tofu, tempeh, chickpeas
  • Vegetables, fruit and whole grains
  • Oily fish 1–2 times a week
  • Olive oil as the main cooking fat

Foods to limit

  • Added salt (≤ 6 g/day)
  • Processed meats and high-additive ready meals
  • Excess animal protein at every meal

Potassium, phosphate and protein needs vary between individuals — please confirm personal targets with your renal team or dietitian. Browse the Kidney Diet Hub for more guides in this cluster.

Frequently asked questions

What is nephrotic syndrome?

A clinical syndrome of heavy proteinuria (>3.5 g/day or ACR >300 mg/mmol), low blood albumin (<30 g/L), oedema (often severe, around the eyes and ankles), and high cholesterol. It is not a single disease but a pattern caused by glomerular damage.

What causes it?

In adults: minimal change disease, FSGS, membranous nephropathy, diabetic nephropathy, amyloidosis. In children: minimal change disease (~90%). Always exclude secondary causes — diabetes, lupus, hepatitis B/C, HIV, malignancy, drugs (NSAIDs, gold, lithium).

What are the complications?

Thrombosis (DVT, PE, renal vein thrombosis — particularly in membranous, treat with anticoagulant if albumin <20 g/L), infection (loss of immunoglobulins), AKI (intravascular volume depletion), hyperlipidaemia, vitamin D deficiency, malnutrition.

How is it treated?

Cause-specific (steroids for minimal change, rituximab for membranous, etc.) plus supportive: salt restriction, loop diuretic, ACE/ARB, statin, anticoagulant if severe hypoalbuminaemia, pneumococcal vaccination.

Can diet reduce protein in urine?

A reduced-salt, Mediterranean-style diet with sensible protein intake can lower urine protein, particularly when combined with prescribed ACE inhibitors, ARBs or SGLT2 inhibitors. Very low-protein diets are not routinely recommended without dietitian supervision.

Nutritional challenges in kidney disease

Many people living with kidney disease have to limit foods because of potassium, phosphate, diabetes, dialysis, appetite changes or simply the time it takes to cook from scratch every day. That can make it harder to keep daily nutrition balanced — particularly for vitamins and minerals that food alone may not fully cover.

Kidney Vitality is a UK-formulated daily nutritional support product designed by Consultant Nephrologist Professor Mohammed Mahdi Althaf with renal nutrition in mind from the start. It keeps doses moderate, leaves out added potassium, phosphate and magnesium, and avoids megadose vitamin A — sitting alongside a kidney-friendly diet, not replacing it.

Why Kidney Vitality fits this need

Built around UK renal guidance

Aligned with KDIGO 2024 Glomerular Diseases and UK Kidney Association guidelines.

Designed by a UK Consultant Nephrologist

Formulated and reviewed by Professor Mohammed Mahdi Althaf (GMC 7216325).

Evidence-based by design

Practical UK guidance for adults with nephrotic syndrome.

Designed by a UK Consultant Nephrologist

Ready to support your kidney health?

If you have been researching kidney health, supplements, CKD nutrition or kidney-friendly living, Kidney Vitality was developed specifically around those principles by Professor Mohammed Mahdi Althaf (GMC 7216325). Nephrologist Developed Daily Multivitamin.

  • No Added Potassium
  • No Added Magnesium
  • No Added Phosphorus
  • No Added Iron
  • One capsule daily
  • UK GMP — BRCGS, NSF GMP, Halal
Subscribe & Save — £20.39/monthCheck your current multivitamin

✓ Free UK tracked delivery  ·  ✓ Delivered every 30 days  ·  ✓ Pause or cancel anytime  ·  ✓ Never run out

ComparisonKidney VitalityTypical high-street multivitamin
Added potassiumNoneOften included
Added phosphateNoneOften included (E338–E452)
Vitamin A (retinol)No megadoseOften high-dose retinol
Kidney-focused formulationYesNo — general population
Consultant Nephrologist involvementYes (GMC 7216325)No
UK GMP manufacturedYes (BRCGS, NSF GMP)Varies

Food supplement. Not a medicine and not a treatment for kidney disease. Speak with your GP, pharmacist or renal team before starting any new supplement, especially in advanced CKD, on dialysis, post-transplant, pregnant or breastfeeding.

Clinical reviewer

Professor Mohammed Mahdi Althaf

Consultant Nephrologist

Acute Physician

GMC 7216325

View Full Biography

Professor Mohammed Mahdi Althaf is a UK Consultant Nephrologist and Acute Physician with a special interest in chronic kidney disease, AKI prevention and renal nutrition. He combines hospital practice with patient education and clinical guidance review.

View professional profile →
View Credentials
  • MD
  • MSc
  • PgDip (Clin Ed)
  • FRCP
  • FHEA
  • FASN

About this article

Written for UK patients and based on:

  • NICE guidance
  • NHS resources
  • British Dietetic Association guidance
  • Kidney Care UK resources
View methodology

Each article is researched against current UK clinical guidance (NICE NG203, NG118, NG136), NHS patient resources, KDIGO and KDOQI international guidelines, and the British Dietetic Association Renal Nutrition Group. Drafts are written by the Kidney Vitality editorial team and reviewed by a UK Consultant Nephrologist before publication. Content is reviewed on a rolling basis and updated when guidance changes.

Editorial standards

  • Clinically reviewed
  • NHS-aligned
  • NICE-aligned
  • Evidence-based
  • Reviewed before publication
View full editorial process

Every article is researched and written by the Kidney Vitality editorial team using current UK clinical guidance (NICE NG203, NG118, NG136), NHS patient resources, KDIGO/KDOQI international guidelines, and British Dietetic Association renal nutrition guidance. Drafts are reviewed for clinical accuracy by Professor Mohammed Mahdi Althaf, MD, MSc, PgDip (Clin Ed), FRCP, FHEA, FASN (Consultant Nephrologist & Acute Physician, GMC 7216325) before publication. Content is updated when UK guidance changes.

References (4)View Sources
  1. NICE NG203: Chronic kidney disease — assessment and management
  2. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
  3. KDOQI Clinical Practice Guideline for Nutrition in CKD: 2020 Update
  4. British Dietetic Association — Renal Nutrition Group

Medical disclaimer

This content is educational only and does not replace personalised medical advice.

Read full disclaimer

This page is general information, not personal medical advice. If you have chronic kidney disease, are on dialysis, have had a kidney transplant, are pregnant or breastfeeding, or take prescription medication, please confirm any supplement with your GP, pharmacist or renal team before starting.

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