Diabetic Emergency First Aid

Knowing the difference between a hypo and a hyper — and what to do in each case — can prevent a minor episode from becoming a serious emergency.

✍️ Paurav Joshi, Director, Ekvarta Ltd 📅 Last updated: May 2026

Hypoglycaemia (Hypo)

Blood glucose below 4 mmol/L

Symptoms: shaking, sweating, pale skin, confusion, palpitations, irritability, hunger, dizziness

Onset: Can come on very quickly — minutes

Hyperglycaemia (Hyper)

Blood glucose above 11 mmol/L

Symptoms: thirst, frequent urination, fatigue, headache, blurred vision, fruity breath (ketones), nausea

Onset: Develops over hours to days

Treating a Hypo — Step by Step

If the person is conscious and can swallow:

  1. 1

    Give Fast-Acting Glucose — 15–20g

    Choose one of the following:
    • 150–200ml of fruit juice or regular (non-diet) fizzy drink
    • 4–5 glucose tablets (such as Glucotabs)
    • 3–4 teaspoons of sugar dissolved in water
    • 5–6 jelly babies
    • Small tube of glucose gel (Glucogel)

  2. 2

    Wait 15 Minutes and Recheck

    Check blood glucose after 15 minutes. If still below 4 mmol/L, repeat the fast-acting glucose. Do this up to 3 times.

  3. 3

    Once Recovered — Give Longer-Acting Carbohydrate

    Once blood glucose is above 4 mmol/L and the person feels better, give a longer-acting carbohydrate snack to prevent a second hypo: a few biscuits, a sandwich, or their next meal if it is due.

Call 999 If:

  • The person is unconscious or cannot swallow — do not give anything by mouth
  • Blood glucose remains below 4 mmol/L after three treatments
  • You are unsure about the person's condition or safety

If the person is unconscious, place in the recovery position and call 999. Emergency services may administer glucagon.

Treating a Hyper

Mild to moderate hyperglycaemia often resolves with medication and hydration. However, severe hyperglycaemia can develop into diabetic ketoacidosis (DKA) in Type 1 diabetes, or hyperosmolar hyperglycaemic state (HHS) in Type 2 — both of which are medical emergencies.

For mild hyperglycaemia (11–15 mmol/L, well, not in distress):

  • Encourage the person to drink plenty of water
  • Ensure medication has been taken as prescribed
  • Encourage gentle activity if appropriate
  • Contact the GP or diabetes team if blood glucose does not come down

Call 999 or go to A&E urgently if the person has:

  • Blood glucose above 15–20 mmol/L (especially in Type 1)
  • Positive blood or urine ketones
  • Vomiting, rapid or laboured breathing
  • Confusion or drowsiness
  • Severe abdominal pain
  • Fruity (pear drop) smell on breath — indicates ketones

Knowing Where Things Are

If you are caring for someone with diabetes, make sure you know:

  • Where the glucose tablets, juice or sugar are kept
  • Where the blood glucose meter is and how to use it
  • Whether the person has an emergency glucagon kit — and if so, where it is and how to use it
  • What the person's target blood glucose range is
  • Whether there is a Seizure/Emergency Action Plan from the diabetes team

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