Short answer · Medically reviewed summary · Last updated: 2026-05-08

Bartter’s syndrome is a group of rare, inherited kidney disorders that impair the kidneys' ability to reabsorb salt, leading to significant electrolyte imbalances and fluid loss. Individuals with Bartter’s syndrome typically experience low potassium levels, high blood pH, and low-to-normal blood pressure, often requiring lifelong management to maintain mineral balance. What causes Bartter’s syndrome? Bartter’s syndrome is caused by genetic mutations that affect the transport of sodium, chloride, and potassium in the thick ascending limb of the loop of Henle in the kidney.

What is Bartter's Syndrome

Name: What is Bartter's Syndrome
Creator: DiseaseMaps Editorial Team
Published: 2016-07-05UTC02:49:48.0000000

What is Bartter's Syndrome? Plain-language, medically reviewed definition plus the lived reality told by patients.

Bartter’s syndrome is a group of rare, inherited kidney disorders that impair the kidneys' ability to reabsorb salt, leading to significant electrolyte imbalances and fluid loss. Individuals with Bartter’s syndrome typically experience low potassium levels, high blood pH, and low-to-normal blood pressure, often requiring lifelong management to maintain mineral balance.

What causes Bartter’s syndrome?

Bartter’s syndrome is caused by genetic mutations that affect the transport of sodium, chloride, and potassium in the thick ascending limb of the loop of Henle in the kidney. When these transporters fail to function, the body loses excessive amounts of salt in the urine. This loss of salt triggers a cascade of hormonal changes, particularly involving the renin-angiotensin-aldosterone system, which explains the characteristic electrolyte disturbances found in patients with Bartter’s syndrome.

How is Bartter’s syndrome classified?

The condition is generally categorized by the specific gene mutation involved, which influences the age of onset and severity of the symptoms. The primary types include:

Type I and II (Antenatal): Often present in utero with polyhydramnios (excess amniotic fluid) and severe symptoms shortly after birth.

Type III (Classic): May present later in childhood or even early adulthood with milder, more variable symptoms.

Type IV: Often associated with sensorineural deafness due to the shared role of specific proteins in both the inner ear and the kidney.

How common is Bartter’s syndrome and who is affected?

Bartter’s syndrome is considered a rare disease, with an estimated prevalence of approximately 1 in 1,000,000 individuals worldwide. It is an autosomal recessive condition, meaning both parents must carry a gene mutation to pass it on to a child. Because it is genetic, it affects males and females equally and can be found in all geographic populations. Currently, 61 people with Bartter’s syndrome have shared their experiences within the DiseaseMaps.org community, highlighting the importance of peer support for this rare diagnosis.

How does it differ from other kidney disorders?

Unlike Gitelman syndrome, which typically presents in adolescence with milder symptoms, Bartter’s syndrome often manifests much earlier in life and is characterized by more significant salt wasting and higher urinary calcium excretion. Distinguishing these conditions is vital for determining the appropriate long-term treatment plan.

Next steps

Consult a pediatric nephrologist or a nephrologist specializing in tubular disorders for specialized care.

Request genetic testing to confirm the specific subtype of Bartter’s syndrome.

Join the DiseaseMaps.org community to connect with other families navigating this diagnosis.

Maintain a detailed log of electrolyte blood tests and medication adherence to share with your care team.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the guidance of a qualified healthcare provider with any questions regarding a medical condition.