Diabetic emergency assessment
An urgent medical check to find out whether dangerously high or low blood sugar is causing a diabetic emergency, and to start the right treatment quickly.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Very high or very low blood sugar with vomiting, drowsiness, confusion or laboured breathing is a 999 emergency — call now, do not wait for a private appointment.
- The assessment confirms whether it is DKA, HHS or severe hypoglycaemia, and starts fluids, insulin or sugar to correct it.
- Blood sugar and ketone readings come back in minutes, but recovery and finding the trigger take hours and often a hospital stay.
- Private same-day medicine can help with milder, stable diabetes problems, but it is never a substitute for 999 in a true emergency.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Quickly confirms whether it is DKA, HHS or severe hypoglycaemia so the right treatment starts fast
A private clinic appointment is the wrong route for anyone with emergency signs — they need 999 or A&E immediately.
Rapid checks of consciousness, breathing and a finger-prick sugar and ketone test decide how urgent things are and what treatment starts.
A named contact in your GP or diabetes team for follow-up and questions.
Rapid checks of consciousness, breathing and a finger-prick sugar and ketone test decide how urgent things are and...
Fluids, insulin or sugar are given and blood is retested often. You may feel rough, thirsty or sleepy as your body...
Sugar, ketones and salts move back towards safe levels. You are usually still in hospital, sometimes in a...
The team treats any trigger such as infection, restarts or adjusts your usual diabetes treatment, and plans how to...
What is a diabetic emergency assessment?
A diabetic emergency assessment is the urgent set of checks a medical team does when someone with diabetes becomes very unwell because their blood sugar is dangerously high or dangerously low. The two high-sugar emergencies are diabetic ketoacidosis (DKA) and the hyperosmolar hyperglycaemic state (HHS). Severe low blood sugar (hypoglycaemia) is the main low-sugar emergency.
If you or someone with diabetes has very high or very low sugar together with vomiting, drowsiness, confusion, deep or fast breathing, or fruity-smelling breath, this is a medical emergency. Call 999 now. Do not wait, and do not try to arrange a private appointment instead — same-day private medicine is never a substitute for 999 when someone is this unwell.
The assessment itself is not a treatment you choose to book. It is what happens after you arrive in an emergency setting: the team measures your blood sugar and ketones, checks your breathing, hydration and consciousness, takes blood and urine tests, and starts fluids, insulin or sugar as needed. The aim is to confirm what is going wrong and correct it safely.
This guide explains what that assessment involves so you understand what to expect and can act fast. It does not replace emergency advice. When in doubt about a diabetic emergency, treat it as an emergency.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Options at a glance
These are the main approaches described in this guide. The right option depends on the diagnosis, your goals and what your clinician thinks is safe.
Diabetic ketoacidosis (DKA)
Mostly affects people with type 1 diabetes. The body runs out of insulin, burns fat for fuel and makes acids called ketones. Signs include very high sugar, vomiting, tummy...
Hyperosmolar hyperglycaemic state (HHS)
Mostly affects older people with type 2 diabetes. Sugar climbs very high (often 30 mmol/L or more) with severe dehydration and drowsiness, usually without the high ketones of...
Severe hypoglycaemia (very low sugar)
Blood sugar drops too low, often from too much insulin or diabetes medicine, missed food, alcohol or extra activity. It can cause confusion, slurred speech, sweating, fits or...
Mixed or unclear picture
Sometimes the cause is not obvious at first, or an infection or other illness has tipped things over. The team treats the emergency while testing to find the trigger.
Preparing for your test
- In a true emergency you do not prepare — call 999 and follow the operator's advice.
- If you can, have someone stay with the unwell person and tell the team they have diabetes and what type.
- Bring or describe their insulin and diabetes medicines, and any recent blood sugar and ketone readings.
- Mention any recent illness, infection, missed insulin, vomiting or alcohol.
- Bring a list of all other medicines, allergies and past medical problems if these are to hand.
- If the person can still swallow safely and sugar is low, give a sugary drink or fast-acting glucose while waiting for help.
What happens
On arrival, the team checks how alert you are, your breathing, pulse and blood pressure, and does a finger-prick blood sugar and ketone test straight away. These first checks take only minutes and decide how urgent things are.
They then take blood from a vein to measure sugar, ketones, salts (such as sodium and potassium), kidney function and the acid level in your blood. They may test your urine, do an ECG heart tracing, and look for a trigger such as an infection. A drip (cannula) is usually placed so fluids and medicines can be given.
For DKA and HHS, treatment is mainly fluids into a vein and insulin, with careful, repeated blood tests to correct sugar and salts safely and not too fast. For severe low sugar, you are given fast-acting sugar by mouth if safe, or glucose or a glucagon injection if you cannot swallow. You are watched closely, often for many hours, and frequently admitted to hospital until you are stable.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- A private clinic appointment is the wrong route for anyone with emergency signs — they need 999 or A&E immediately.
- Trying to manage worsening high ketones, persistent vomiting or drowsiness at home is unsafe.
- Waiting for a routine appointment when sugar is dangerously high or low risks serious harm.
- Self-correcting with extra insulin without medical advice during illness can be dangerous.
Delay or rearrange if…
- Do not delay emergency assessment if there are danger signs — call 999 now.
- For non-emergency reviews only: delay a routine appointment if you become acutely unwell and need urgent care instead.
- Hold off on changing your own insulin regimen until you have specialist advice after an emergency.
- Postpone planned procedures or travel until your diabetes is stable and reviewed.
Alternatives to discuss
- 999 ambulance or A&E for any suspected diabetic emergency — this is the safe default.
- For urgent but non-emergency diabetes advice when you are unsure: use NHS 111 in England, Scotland or Wales; in Northern Ireland, contact your GP out-of-hours service or your HSC Trust's Phone First arrangement (Northern Ireland does not have a region-wide 111 service).
- Your GP or NHS diabetes team for routine review, education and medicine changes.
- Private specialist diabetes review for stable, non-urgent matters or a second opinion.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Quickly confirms whether it is DKA, HHS or severe hypoglycaemia so the right treatment starts fast
- Corrects dangerous sugar, fluid and salt levels in a controlled, monitored way
- Looks for and treats the trigger, such as infection or missed insulin
- Reduces the risk of serious complications from a diabetic emergency
- Gives you and your team a clear plan to prevent it happening again
Risks & complications
- Discomfort and bruising from cannulas and repeated blood tests
- Feeling very unwell, thirsty, sick or tired during treatment
- Needing frequent finger-prick and blood tests over several hours
- Blood salts (especially potassium) moving too high or too low, needing careful correction
- Low blood sugar during treatment if insulin and glucose are not finely balanced
- Needing a longer hospital stay or higher-level monitoring than expected
- Serious complications of the emergency itself, such as fluid on the brain (mainly in younger people with DKA), severe dehydration effects or clots
- Life-threatening deterioration if the emergency is recognised or treated too late
The biggest danger is delay. DKA, HHS and severe hypoglycaemia can become life-threatening, so the priority is getting emergency help fast rather than waiting to see if symptoms settle. During treatment, the main things the team watches closely are how quickly sugar and salts are corrected. Ask the team what your trigger was and how to spot warning signs earlier next time.
Published figures to discuss
Outcomes from diabetic emergencies vary widely with how quickly help is sought, the person's age and other health problems, and the trigger. HHS in older people tends to carry a higher risk than uncomplicated DKA, and severe hypoglycaemia is more dangerous if it is prolonged or unwitnessed. Because published figures depend heavily on the setting and population studied, exact percentages can mislead, so reputable sources stress early recognition rather than precise risk numbers.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Diabetic ketoacidosis | Medical emergency | Vomiting, abdominal pain, deep breathing, ketones or drowsiness in diabetes needs urgent care. | NHS — Diabetic ketoacidosisnhs.ukSource-linked context |
| Hypoglycaemia | Common with insulin/sulfonylureas | Confusion, sweating, collapse or seizure can occur and driving/safety advice matters. | Guide sourcesClinical context |
| Hyperosmolar hyperglycaemic state | Emergency, especially in older adults with type 2 diabetes | Severe dehydration, very high glucose and confusion require hospital treatment. | NHS — Diabetic ketoacidosisnhs.ukSource-linked context |
| Trigger missed | Common | Infection, missed insulin, steroids, heart attack, pregnancy or new diabetes can trigger emergencies. | NHS — Diabetic ketoacidosisnhs.ukSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
Recovery here means how you respond to emergency treatment and what happens afterwards. Most people improve over hours as sugar, fluids and salts are corrected, but you usually stay in hospital until you are stable and the cause is understood.
- Feeling drained, thirsty or shaky for a day or two as your body recovers
- Bruising at cannula and blood-test sites
- Needing frequent monitoring before and after you feel better
- Some anxiety about it happening again — this is common and worth talking through
Aftercare
- Follow the diabetes team's advice on restarting insulin or medicines exactly.
- Learn and keep your 'sick-day rules' for when you are unwell, vomiting or not eating.
- Make sure you can check ketones (for type 1 diabetes especially) and know the numbers that mean danger.
- Treat infections and other illnesses promptly, as these often trigger emergencies.
- Keep fast-acting sugar to hand if you are at risk of low sugar, and tell those close to you how to help.
- Attend follow-up so your diabetes plan and any new medicines are reviewed.
- Know exactly when to call 999 and when to contact your diabetes team.
- Your diabetes type and usual medicines written down
- A working blood glucose meter and, where relevant, a ketone meter
- Up-to-date sick-day rules from your diabetes team
- Fast-acting glucose at home, in your bag and at work
- A glucagon kit if advised, and someone trained to use it
- Your GP and diabetes team contact details saved
- A clear list of warning signs that mean call 999
⚠ Get urgent help if…
- Very high or very low blood sugar with vomiting, drowsiness or confusion — call 999
- Deep, fast or laboured breathing, or breath that smells fruity (like pear drops or nail polish) — call 999
- High ketones (over 3 mmol/L in blood, or 2+ in urine) with symptoms — seek emergency help
- Becoming difficult to wake, very confused, or unconscious — call 999
- A fit (seizure) in someone with diabetes — call 999
- Severe dehydration: sunken eyes, very dry mouth, passing little or no urine
- Low sugar that does not respond to sugary food and drink
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A good result is that the emergency is recognised quickly, sugar, fluids and salts are corrected safely, the trigger is found and treated, and you recover without lasting harm. Blood sugar and ketone numbers come back within minutes and guide treatment, but feeling better can lag behind the numbers.
No single set of results can promise that an emergency will not happen again. The most useful outcome is a clear understanding of what caused this episode and a practical plan to reduce the chance of another.
A diabetic emergency is a one-off event that needs urgent correction, not a treatment with a lasting result. What lasts is the plan made afterwards: better sick-day rules, prompt treatment of infections, the right diabetes medicines and regular review. As your health and circumstances change, that plan needs revisiting with your diabetes team.
Related tests, treatments or support
Assessment of a diabetic emergency usually goes hand in hand with looking for a trigger, so you may also have tests for infection, a chest X-ray, an ECG, or other checks at the same time. Treating the underlying cause is part of treating the emergency.
Follow-up & long-term care
After a diabetic emergency you should be reviewed by your GP or specialist diabetes team, often within days to weeks. Follow-up checks your recovery, reviews why it happened, updates your medicines and sick-day rules, and may include education to help you prevent and recognise emergencies earlier.
- Keep blood glucose monitoring equipment, and ketone testing where relevant, working and in date.
- Review insulin or medicine doses with your team if illnesses or lows keep happening.
- Refresh your sick-day rules and know your danger numbers.
- Keep vaccinations up to date, as infections are a common trigger.
- Make sure people around you know how to help in an emergency.
Repeat, follow-on and what comes next
- Blood tests are deliberately repeated many times during treatment to correct sugar and salts safely, not because something has gone wrong.
- Some people need a longer stay or higher-level monitoring if salts shift or the trigger is serious.
- Recurrent emergencies usually mean the treatment plan, sick-day rules or support need reviewing rather than just repeating the same approach.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A named contact in your GP or diabetes team for follow-up and questions.
- Written, personalised sick-day rules and clear danger numbers.
- A plan to find and treat the trigger, including infection screening if relevant.
- Education on ketone testing, hypo treatment and when to escalate to 999.
- Review of insulin or medicines and equipment to reduce the chance of another emergency.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- This is emergency care and should go through 999 or A&E, not a paid private booking.
- Any non-emergency private follow-up cost depends on the specialist's fee and appointment length.
- Whether blood tests, scans or an ECG are included in a private review.
- Diabetes education sessions or technology reviews if arranged privately.
- Follow-up appointments and any written reports or letters.
- Confirmation that a genuine emergency must go to 999 or A&E, not a private clinic.
- For any private follow-up: the specialist's fee and what the appointment covers.
- Whether tests, scans or an ECG are included or charged separately.
- Whether a written plan, sick-day rules and a clinic letter are provided.
- Follow-up arrangements and how to get urgent advice between appointments.
- What happens, and who is responsible, if you deteriorate.
On the NHS? Diabetic emergencies are treated free of charge on the NHS through 999 and A&E; this urgent care should never be delayed to arrange a private appointment.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Being reassured to 'wait and see' at home when emergency signs are present.
- Not being told the specific numbers and symptoms that mean call 999.
- Leaving hospital without clear sick-day rules or a follow-up plan.
- A private provider taking on an acutely unwell diabetic patient who should be in emergency care.
Marketing red flags
- Any private service implying it can safely handle a diabetic emergency instead of 999.
- Promises of same-day 'fixes' for dangerously high or low sugar outside an emergency setting.
- Downplaying the seriousness of ketones, vomiting or drowsiness.
- Selling tests or treatments without a clear emergency-safety plan.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- What caused this episode, and was it DKA, HHS or a severe low?
- What are my personal warning signs and danger numbers?
- What are my sick-day rules when I am unwell or not eating?
- Should my insulin or diabetes medicines be changed after this?
- When and how should I check ketones, and when must I call 999?
- Who do I contact for urgent diabetes advice that is not an emergency?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Should I call 999 or arrange a private same-day appointment?
How do I tell the difference between DKA and HHS?
What if my blood sugar is low rather than high?
Will I have to stay in hospital?
Can private healthcare help with my diabetes at all?
How can I stop this happening again?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Diabetic ketoacidosis NHS inform — Diabetic ketoacidosis (DKA) British Red Cross — Diabetic emergency first aid nidirect — Urgent and emergency care services nidirect — GP out-of-hours service
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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