Medically Reviewed by Dr. Andrew Stein MD, Consultant Nephrologist (Hospital Kidney Specialist). Last updated: June 2026
Indications for acute dialysis are life-threatening complications of acute kidney injury (AKI) that fail to respond to medical management.
These are best remembered by the classic 5-item ‘AEIOU’ mnemonic: Acidosis, Electrolyte imbalance, Intoxication, Overload, and Uraemia.
Severe metabolic acidosis, typically when the blood pH is 7.2 or below despite treatment.
Life-threatening abnormalities – most commonly severe hyperkalemia (potassium > 6.5 mmol/L), or rapid increases with ECG changes (e.g. peaked T-waves) – that do not respond to medical therapy.
Dialysis can also be used to treat other severe electrolyte imbalance, including hypercalcaemia (calcium > 4.0 mmol/).
Acute overdose or poisoning by dialysable substances. Common examples include alcohols (methanol, ethylene glycol), lithium, salicylates, and certain medications.
Severe fluid overload, principally acute pulmonary oedema (fluid in the lungs) that is unresponsive to high-dose diuretics.
Neurological or systemic complications of toxin buildup in the blood. This includes uraemic encephalopathy (confusion, seizures), uraemic pericarditis (inflammation of the heart lining), or uraemic bleeding.
Note. If the blood urea is >50 mmol/L, you need a good reason not to dialyse. If renal function worsens, spontaneous bleeding often occurs
Deciding when to start is highly patient-specific, and usually determined by a nephrologist or intensive care team – especially regarding the choice between continuous or intermittent dialysis/filtration.
Is there any advantage in starting acute dialysis early?
If none of these emergencies are happening, doctors often wait. Recent studies, such as the LIBERATE-D trial (Walker, 2025), show that delaying dialysis when the patient is stable allows many patients to recover their kidney function without ever needing the machine.
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