# Diabetic Ketoacidosis in Children

> Diabetic ketoacidosis in children for NEET-PG Paediatrics, covering ISPAD criteria, fluid and insulin protocol, potassium and cerebral oedema prevention.

- Canonical URL: https://prepelephant.com/topics/neet-pg/paediatrics/diabetic-ketoacidosis-in-children
- Exam / course: NEET-PG · Subject: Paediatrics
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-08
- Last updated: 2026-10-08
- Reference basis: ISPAD Clinical Practice Consensus Guidelines; Nelson Textbook of Pediatrics
- How to cite: "Diabetic Ketoacidosis in Children", PrepElephant, https://prepelephant.com/topics/neet-pg/paediatrics/diabetic-ketoacidosis-in-children

## Direct answer

Diabetic ketoacidosis in children is an acute metabolic emergency with hyperglycaemia, ketonaemia and metabolic acidosis, often at presentation of type 1 diabetes. ISPAD criteria require glucose above 11 mmol/L or known diabetes, venous pH below 7.3 or bicarbonate below 18 mmol/L, and blood beta-hydroxybutyrate of 3 mmol/L or more. Management combines cautious fluid replacement, low-dose intravenous insulin and potassium, with neurological monitoring because cerebral oedema is the feared complication.

## What you must remember

- **Diagnostic criteria:** glucose above 11 mmol/L or known diabetes, venous pH below 7.3 or bicarbonate below 18 mmol/L, and ketonaemia of 3 mmol/L or more or significant ketonuria.
- **Severity:** mild (pH below 7.3 or bicarbonate below 18), moderate (pH below 7.2 or bicarbonate below 10), and severe (pH below 7.1 or bicarbonate below 5).
- **Fluids:** isotonic resuscitation for shock, then maintenance and deficit replacement over 48 hours, with sodium and osmolality watched closely.
- **Insulin:** continuous low-dose intravenous insulin started after the potassium is known, with dextrose added when glucose falls to about 14 mmol/L.
- **Potassium:** total body potassium is depleted even when the serum level is normal or high, so replacement follows once urine output is adequate.
- **Cerebral oedema:** the feared complication, more likely in younger children and with severe acidosis; warning signs include headache, bradycardia, rising blood pressure and falling consciousness.

## A protocol-driven sequence of care

Protocol-based care reduces the risk of cerebral oedema, which depends as much on how fluid and sodium are changed as on the presenting acidosis.

1. **Assess and stabilise:** check airway, breathing, circulation, conscious level and shock, and start resuscitation according to the ABC approach.
2. **Resuscitate with fluids:** give isotonic saline or a balanced crystalloid for shock, then replace the deficit over 48 hours while avoiding rapid changes in osmolality.
3. **Start insulin after the potassium check:** begin continuous low-dose intravenous insulin, adding dextrose when glucose falls to about 14 mmol/L so that glucose falls gradually.
4. **Monitor frequently:** record glucose, electrolytes, pH, neurological status and fluid balance at protocol intervals, correcting sodium as glucose falls.
5. **Avoid routine bicarbonate:** reserve it for very severe acidaemia with life-threatening features, since routine use is not recommended.
6. **Treat cerebral oedema promptly:** give osmotherapy with mannitol or hypertonic saline, support ventilation and arrange urgent neuro-imaging, because mortality is high.

## Where the exam tries to catch you

DKA questions reward the candidate who recognises the complications of treatment as well as the disease itself.

- **Trap:** giving bicarbonate routinely to correct acidosis — **Correct:** routine bicarbonate is not recommended and has been linked with cerebral oedema.
- **Trap:** lowering serum sodium or osmolality quickly — **Correct:** rapid osmolar shifts are linked with cerebral oedema, so changes are gradual.
- **Trap:** starting insulin without knowing the potassium — **Correct:** insulin drives potassium into cells, and total body potassium is already depleted.
- **Trap:** attributing reduced consciousness to acidosis alone — **Correct:** cerebral oedema must be considered and treated urgently.

## Frequently asked questions

### What are the ISPAD criteria for diabetic ketoacidosis in children?

ISPAD criteria require glucose above 11 mmol/L or known diabetes, venous pH below 7.3 or bicarbonate below 18 mmol/L, and ketonaemia of 3 mmol/L or more. Severity is graded by the depth of acidosis, from mild to severe.

### Why is bicarbonate avoided in diabetic ketoacidosis?

Routine bicarbonate in diabetic ketoacidosis is not recommended, since it has not improved outcomes and may be associated with cerebral oedema. It is reserved for very severe acidosis with life-threatening features.

### Which children are at highest risk of cerebral oedema in diabetic ketoacidosis?

Younger children, particularly those under five years, and those with severe acidosis or high urea at presentation have the highest risk of cerebral oedema in diabetic ketoacidosis. Rapid changes in serum osmolality during treatment are a further trigger.

### What are the early signs of cerebral oedema in diabetic ketoacidosis?

Headache, a fall in heart rate, rising blood pressure, altered consciousness and incontinence are early warning signs of cerebral oedema in diabetic ketoacidosis. These signs need urgent assessment and osmotherapy.

### Why is potassium replacement needed in diabetic ketoacidosis?

Total body potassium is depleted in diabetic ketoacidosis even when serum potassium appears normal or high, and insulin drives potassium into cells. Replacement starts once the serum level is known and urine output is adequate.