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

Bartter and Gitelman Syndromes

A UK Consultant Nephrologist's deep-dive on the inherited salt-wasting tubulopathies — Bartter and Gitelman syndromes — where the kidney behaves as if it's on permanent loop or thiazide diuretic therapy.

  • 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

Hypokalaemic metabolic alkalosis + high urine chloride + normal BP = think Bartter or Gitelman. Distinguish by urine calcium (high in Bartter, low in Gitelman) and serum magnesium (often low in Gitelman). Lifelong K and Mg replacement; NSAIDs in Bartter.

Key recommendation: Inherited tubulopathies causing hypokalaemic metabolic alkalosis.

Quick answer

✓ Best choices

  • Vegetables, lower-potassium fruit and whole grains
  • Sensible portions of fish, eggs, chicken or tofu
  • Olive oil and unsalted nuts in small amounts

✓ Foods to limit

  • Added salt and ultra-processed foods
  • Phosphate additives in processed meats and ready meals
  • Sugary and energy drinks

Key takeaway

Hypokalaemic metabolic alkalosis + high urine chloride + normal BP = think Bartter or Gitelman. Distinguish by urine calcium (high in Bartter, low in Gitelman) and serum magnesium (often low in Gitelman). Lifelong K and Mg replacement; NSAIDs in Bartter.

Who should be cautious

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

Bartter and Gitelman Syndromes

Genetic subtypes

BARTTER SYNDROME (loop of Henle defect):

  • Type 1: SLC12A1 (NKCC2) — antenatal
  • Type 2: KCNJ1 (ROMK) — antenatal; transient neonatal hyperkalaemia, then hypokalaemia
  • Type 3: CLCNKB (chloride channel ClC-Kb) — classical, often presents later, milder, can resemble Gitelman
  • Type 4a: BSND (barttin) — with sensorineural deafness
  • Type 4b: combined CLCNKA + CLCNKB — with deafness
  • Type 5: MAGED2 (X-linked) — transient antenatal

GITELMAN SYNDROME (distal convoluted tubule):

  • SLC12A3 (NCC, the thiazide-sensitive sodium-chloride cotransporter)
  • Autosomal recessive

Inheritance

  • Both autosomal recessive (Gitelman; most Bartter)
  • MAGED2 X-linked
  • Compound heterozygosity common; family history may be subtle

Clinical features

ANTENATAL BARTTER (types 1, 2, 4, 5):

  • Polyhydramnios, prematurity
  • Severe neonatal polyuria, dehydration, hypokalaemia, metabolic alkalosis
  • Failure to thrive
  • Nephrocalcinosis from hypercalciuria
  • MAGED2 type often resolves after birth

CLASSICAL BARTTER (type 3):

  • Presents in childhood or later
  • Polyuria, polydipsia, salt craving
  • Hypokalaemia, alkalosis
  • Normal-to-low BP
  • Variable hypercalciuria
  • Can mimic Gitelman if late presentation

Gitelman Syndrome

  • Adolescent or adult presentation
  • Fatigue, muscle cramps, weakness, tetany
  • Salt craving
  • Palpitations (long QT from hypoK/hypoMg)
  • Polyuria less prominent than Bartter
  • Chondrocalcinosis (pseudogout) in older patients
  • Growth retardation in some children

BIOCHEMICAL HALLMARKS — both:

  • Hypokalaemia
  • Metabolic alkalosis (high bicarbonate)
  • High urine chloride (rules out vomiting and diuretic withdrawal)
  • Hyperreninaemia and hyperaldosteronism with normal-to-low BP

Discriminators

  • Urine calcium/creatinine ratio: HIGH in Bartter, LOW in Gitelman
  • Serum magnesium: usually NORMAL in Bartter, LOW in Gitelman
  • Nephrocalcinosis: common in Bartter, rare in Gitelman

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.

Diagnosis

Blood Tests

  • U&E, magnesium, bicarbonate
  • Renin, aldosterone (both elevated)
  • Acid-base (venous gas)

Urine Tests

  • Urinary electrolytes (Na, K, Cl) — urine Cl >20 mmol/L despite hypokalaemia
  • Urine calcium/creatinine ratio
  • Urine magnesium
  • Urine diuretic screen — essential to exclude surreptitious diuretic use

Imaging

  • Renal ultrasound for nephrocalcinosis (Bartter)

Genetics

  • NHS Genomic Medicine Service Renal panel R195 or similar covers SLC12A1, KCNJ1, CLCNKB, BSND, CLCNKA, MAGED2, SLC12A3
  • Confirms diagnosis and aids family counselling

Differential

  • Surreptitious diuretic use (lab confirms)
  • Surreptitious vomiting / laxative abuse (low urine Cl)
  • Liddle syndrome (hypertensive, normal renin)
  • Apparent mineralocorticoid excess (hypertensive)
  • Cisplatin or aminoglycoside-induced Mg wasting

Treatment

Bartter Syndrome

  • Oral potassium chloride supplementation, often high doses (1-5 mmol/kg/day)
  • Magnesium replacement if low
  • Salt liberalisation
  • Potassium-sparing diuretic: spironolactone, eplerenone, amiloride — reduces K loss
  • NSAID (indomethacin most studied) — reduces prostaglandin-driven salt wasting; effective especially in antenatal/classical forms; monitor for GI and renal toxicity
  • Treat dehydration aggressively in infants
  • Growth and development monitoring in children

Gitelman Syndrome

  • Oral potassium chloride supplementation
  • Magnesium replacement — oral magnesium oxide or magnesium glycinate (better tolerated)
  • Liberal salt intake
  • Potassium-sparing diuretic (spironolactone or amiloride) for refractory hypokalaemia
  • NSAIDs less helpful than in Bartter
  • Treat tetany or arrhythmia in hospital with IV K/Mg

General Measures

  • Lifestyle: avoid dehydration, vomiting and diarrhoea (worsens electrolyte loss)
  • Education: emergency replacement plans during illness
  • Annual BP, eGFR, urine ACR, electrolytes
  • ECG with attention to QT interval
  • Pre-operative: optimise K and Mg; alert anaesthetist
  • Pregnancy: increased potassium and magnesium needs; multidisciplinary care; usually safe

Drugs To Avoid Or Use With Caution

  • Loop and thiazide diuretics (worsen the underlying defect)
  • ACE inhibitors / ARBs — can be used cautiously if hypertensive in later life, but watch for AKI
  • NSAIDs in Gitelman (less benefit, more renal risk)

Prognosis

  • Most patients have a normal lifespan and quality of life with good electrolyte control
  • CKD develops in a minority — generally mild
  • Sudden cardiac death from arrhythmia is rare but recognised; treat hypokalaemia and hypomagnesaemia promptly
Renal Tubular Acidosis (RTA)
Related reading: Renal Tubular Acidosis (RTA).

Key practical tips

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

  • Cook from scratch when you can
  • Read sodium labels (≤ 0.3 g per 100 g is low)
  • Take any concerns to your GP or renal team early

Clinical guidance

TL;DR summary

Hypokalaemic metabolic alkalosis + high urine chloride + normal BP = think Bartter or Gitelman. Distinguish by urine calcium (high in Bartter, low in Gitelman) and serum magnesium (often low in Gitelman). Lifelong K and Mg replacement; NSAIDs in Bartter.

Key takeaways
  • Inherited tubulopathies causing hypokalaemic metabolic alkalosis.
  • Bartter = loop-diuretic phenotype; Gitelman = thiazide phenotype.
  • Urine calcium and serum magnesium discriminate the two.
  • Exclude diuretic abuse and surreptitious vomiting first.
  • Lifelong K + Mg replacement; NSAIDs help in classical Bartter.
Kidney Diet & Nutrition Considerations

Diet is one of the most powerful tools you have to look after your kidneys. UK renal guidance points to a Mediterranean-style, reduced-salt pattern: plenty of vegetables, lower-potassium fruit, whole grains, sensible protein, beans and pulses in moderation, oily fish and olive oil. Personal targets — for potassium, phosphate, protein and fluid — should be set by your renal team based on your bloods.

Foods to prioritise

  • Vegetables, lower-potassium fruit and whole grains
  • Sensible portions of fish, eggs, chicken or tofu
  • Olive oil and unsalted nuts in small amounts

Foods to limit

  • Added salt and ultra-processed foods
  • Phosphate additives in processed meats and ready meals
  • Sugary and energy drinks

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 are Bartter and Gitelman syndromes?

Inherited tubulopathies causing hypokalaemia, metabolic alkalosis and normal to low blood pressure. Bartter syndrome mimics chronic loop diuretic use (defect in the loop of Henle); Gitelman syndrome mimics chronic thiazide diuretic use (defect in the distal convoluted tubule). Both are autosomal recessive.

How do they differ clinically?

Bartter usually presents in infancy or childhood with failure to thrive, polyuria, severe hypokalaemia and metabolic alkalosis; hypercalciuria and nephrocalcinosis are common. Gitelman usually presents in adolescence or adulthood with milder symptoms — fatigue, muscle cramps, salt craving, palpitations — and is characterised by HYPOmagnesaemia and HYPOcalciuria (the opposite calcium pattern to Bartter).

How is the diagnosis made?

Confirm with: persistent hypokalaemic metabolic alkalosis, high urinary chloride excretion (>20 mmol/L) excluding diuretic abuse and vomiting, urine calcium/creatinine ratio (high in Bartter, low in Gitelman), serum magnesium (low in Gitelman), normal-to-low BP, plasma renin and aldosterone both high. Genetic testing via the NHS Genomic Medicine Service confirms the diagnosis and the subtype.

What is the treatment?

Lifelong potassium and magnesium replacement. Salt liberalisation. Potassium-sparing diuretics (spironolactone, eplerenone, amiloride). NSAIDs (especially indomethacin) help in classical Bartter by reducing prostaglandin-driven salt wasting. Surveillance for nephrocalcinosis and CKD. Most patients live a normal life with good electrolyte control.

What foods are good for kidney health?

A Mediterranean-style, mostly plant-based, reduced-salt diet is the most consistent evidence-based pattern for kidney health. Build meals around vegetables, lower-potassium fruit, whole grains, fish, eggs or tofu, beans and pulses in moderation, and olive oil.

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 guidance

Aligned with the European Bartter/Gitelman consensus statements and UK Genomic Medicine Service renal panels.

Designed by a UK Consultant Nephrologist

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

Patient-friendly lifelong plan

Practical UK guidance for electrolyte replacement, sick-day rules and family screening.

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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