MCR Diabetes & Eye Care · Kannur, Kerala
+91 9497 222 722
Diabetic Ketoacidosis (DKA): Warning Signs, Emergency Response, and Prevention
Diabetic ketoacidosis (DKA) is the most serious acute complication of diabetes. It develops when the body has too little insulin to use glucose for fuel and starts breaking down fat instead, flooding the blood with acidic ketones. Untreated, DKA can progress rapidly to severe dehydration, altered consciousness and death. Early recognition and urgent hospital treatment improve outcomes. Our specialist diabetologist at MCR Diabetes & Eye Care, Kannur, explains the warning signs, the emergency response, and the warning signs and sick-day steps that can reduce risk.
Evidence-based clinical note: DKA is a medical emergency and requires urgent clinical assessment. It can occur in type 1 or type 2 diabetes and may occur with near-normal glucose in people taking an SGLT2 inhibitor. During illness, do not stop basal insulin unless your treating clinician instructs you; use correction insulin only according to your written personal sick-day plan.
24-48 hrs
how fast DKA can become life-threatening
Infection
the most common single trigger
Never stop insulin
the core sick-day rule
Mostly preventable
with ketone testing and a plan
DKA is most associated with type 1 diabetes, where it is frequently the presenting event at diagnosis — see our guide on type 1 vs type 2 diabetes. However, it also occurs in type 2 diabetes during severe illness, infection, surgery, or when insulin is stopped. A newer pattern, euglycaemic DKA, occurs in patients on SGLT2 inhibitor medications and is particularly dangerous because blood sugar can look almost normal while ketoacidosis develops underneath.
What Actually Happens in DKA
Insulin does two jobs: it lets glucose into cells, and it suppresses fat breakdown. When insulin is severely deficient:
- Glucose cannot enter cells, so blood sugar climbs — often above 250-300 mg/dL
- Cells starve despite the abundant glucose outside them
- The body breaks down fat for emergency fuel, producing ketones
- Ketones are acidic; as they accumulate, blood pH falls
- High blood sugar pulls water into the urine, causing severe dehydration
- Potassium and other electrolytes are lost in large quantities
The combination — acidosis, dehydration, and electrolyte loss — is what makes DKA a medical emergency rather than simply “high sugar.”
Key fact: The classic path into DKA is stopping insulin because you cannot eat. Illness raises insulin requirements even when appetite disappears — the basal dose is needed to suppress ketone production, regardless of what you have eaten.
Warning Signs in Order of Appearance
Early (hours to a day)
- Blood sugar persistently above 250 mg/dL
- Extreme thirst and dry mouth
- Frequent, high-volume urination
- Fatigue and weakness
- Positive urine or blood ketones
Progressing
- Nausea and vomiting
- Abdominal pain — sometimes severe enough to mimic appendicitis
- Loss of appetite
- Muscle aches
- Flushed, dry skin
Advanced — Emergency
- Deep, rapid, sighing breathing (Kussmaul respiration) as the body tries to blow off acid
- A sweet, fruity or nail-polish odour on the breath
- Confusion, drowsiness, difficulty concentrating
- Rapid pulse with low blood pressure
- Unresponsiveness or coma
⚠ Important: Patients on SGLT2 inhibitors can develop euglycaemic DKA with blood sugar under 200 mg/dL. If you take empagliflozin, dapagliflozin, or canagliflozin, test ketones for nausea, vomiting, abdominal pain, or breathlessness regardless of how reassuring your glucose reading looks.
What Triggers DKA
| Trigger | Why It Causes DKA |
|---|---|
| Infection (most common) | Stress hormones raise glucose and insulin needs sharply |
| Missed or stopped insulin | No suppression of fat breakdown and ketone production |
| New-onset type 1 diabetes | Often the presenting event at diagnosis |
| Insulin pump failure | Only rapid-acting insulin is used — reserves run out in hours |
| Heat-damaged or expired insulin | Looks normal, delivers little effect |
| SGLT2 inhibitors during illness/fasting | Euglycaemic DKA with near-normal glucose |
| Surgery, trauma, heart attack | Major physiological stress |
| Steroid medications | Sharply raise glucose and insulin requirement |
| Alcohol binge or prolonged fasting | Promotes ketone production |
Infection is the single most common trigger, which is why the Kerala monsoon and fever season deserve extra vigilance — see our monsoon health guide for diabetics.
Testing for Ketones at Home
Every insulin-treated household should keep ketone testing supplies. Two options:
- Urine ketone strips — inexpensive (₹150-350 per bottle), widely available, easy. They lag behind real-time blood levels but are adequate for home screening.
- Blood ketone meters — more accurate and real-time, measuring beta-hydroxybutyrate. Strips cost more but give a clearer picture in an emergency.
Test for ketones whenever: blood sugar is above 250 mg/dL twice in a row, you are ill or feverish, you have nausea or vomiting, you have abdominal pain, or you have missed insulin doses.
Interpreting Blood Ketone Results
- Below 0.6 mmol/L: normal
- 0.6-1.5 mmol/L: elevated — act now (extra insulin, fluids, recheck in 2 hours, contact your doctor)
- 1.5-3.0 mmol/L: high risk of DKA — seek urgent same-day clinical advice; go to emergency care sooner if vomiting, dehydrated, drowsy, breathless or worsening
- Above 3.0 mmol/L: go to an emergency department now
Sick-Day Rules: The Core of Prevention
Many DKA episodes can be prevented with a personalised sick-day plan and early action. Every diabetic on insulin — and their family — should know these by heart:
- Never stop insulin. This is the single most important rule. Illness raises insulin requirements even when you are eating less. Stopping insulin because you cannot eat is the classic path into DKA.
- Test blood sugar every 2-4 hours while unwell.
- Test ketones every 4 hours if sugar is above 250 mg/dL or you feel unwell.
- Sip fluids regularly if you can keep them down. The amount and type must be individualised for children and for people with heart or kidney disease; use carbohydrate-containing fluids only when your sick-day plan calls for them.
- Replace meals with easily tolerated carbohydrate — kanji, rice gruel, soup, curd, juice — if solid food is impossible.
- Take correction insulin only according to the written, individualised plan provided by your diabetes clinician. If you do not have one—or ketones are rising—contact urgent medical care.
- Pause certain oral medications — metformin and SGLT2 inhibitors are usually held during vomiting, diarrhoea, or dehydration. Confirm with your doctor rather than deciding alone; see our diabetes medications guide.
- Have a written plan agreed in advance with your doctor, kept where family can find it.
When to Go to Hospital Immediately
- Blood ketones above 3.0 mmol/L, or urine ketones showing large/++++
- Persistent vomiting — unable to keep fluids down for more than a few hours
- Blood sugar above 300 mg/dL that will not come down with correction doses
- Deep, rapid breathing or breathlessness at rest
- Drowsiness, confusion, or difficulty staying awake
- Severe abdominal pain
- Signs of severe dehydration — no urine for many hours, sunken eyes, rapid weak pulse
Do not wait to see if it improves overnight. DKA progresses faster than most people expect, and the outcome depends heavily on how early treatment begins.
Get Your Written Sick-Day Plan
Every insulin-treated patient should have a personalised sick-day protocol and ketone testing supplies at home. We provide both, plus family training on warning signs.
Euglycaemic DKA: The Dangerous Exception
Patients on SGLT2 inhibitors (empagliflozin, dapagliflozin, canagliflozin) can develop DKA with blood sugars that are only mildly raised — sometimes under 200 mg/dL. Because the number looks reassuring, diagnosis is often delayed.
If you take an SGLT2 inhibitor, treat nausea, vomiting, abdominal pain, breathlessness, or unusual fatigue as ketone-testing situations regardless of your glucose reading. These medications should also be paused before surgery, during prolonged fasting, and during acute illness — discuss the specific plan with your diabetologist in advance.
How DKA Is Treated in Hospital
Treatment is straightforward when started promptly, and typically involves:
- Intravenous fluids — to correct dehydration, usually litres over the first hours
- Intravenous insulin infusion — a continuous controlled drip, not large injections
- Potassium replacement — levels fall sharply as insulin drives potassium into cells; this is closely monitored
- Treating the trigger — antibiotics for infection, and so on
- Monitoring — glucose, ketones, electrolytes, and blood gases every few hours
Most uncomplicated cases resolve within 24 hours. Recovery is followed by review of what caused the episode and adjustment of the home plan so it does not recur.
Preventing Recurrence
- Never run out of insulin — keep a buffer supply and a backup pen
- Keep ketone strips in date and easily accessible
- Store insulin correctly, especially in Kerala’s heat and humidity
- Get vaccinated against influenza and pneumococcal disease
- Treat infections early rather than waiting
- Use continuous glucose monitoring if you have had a previous episode — see our CGM guide
- Review your sick-day plan with your doctor annually
- Address the practical barriers honestly — cost, needle fear, or forgetting doses are all fixable when discussed
DKA at a Glance
| Aspect | Key Point |
|---|---|
| Core problem | Severe insulin deficiency → ketone build-up → blood acidity |
| Typical glucose | Above 250 mg/dL (but can be normal on SGLT2 inhibitors) |
| Test at home | Urine ketone strips or blood ketone meter |
| Act now | Blood ketones 0.6-1.5 mmol/L |
| Emergency | Blood ketones above 3.0 mmol/L |
| Red flag symptoms | Vomiting, deep rapid breathing, drowsiness, fruity breath |
| Golden rule | Never stop insulin during illness |
| Hospital treatment | IV fluids, insulin infusion, potassium replacement |
Frequently Asked Questions
Below are the questions our patients ask most often. If you have additional questions, our specialist team at MCR Diabetes & Eye Care, Kannur, is always available to help.
Can type 2 diabetics get DKA?
Yes, though less commonly than type 1. It occurs during severe infection, surgery, major stress, or in patients on SGLT2 inhibitors. Type 2 patients on insulin who stop it during illness are also at risk.
How is DKA different from a hypo?
They are opposites. Hypoglycemia is dangerously low sugar developing over minutes and treated with fast carbohydrate. DKA is high sugar with ketones developing over hours to days and treated with insulin and fluids. Confusing them is dangerous — always test rather than guess.
Do I need a blood ketone meter, or are urine strips enough?
Urine strips are adequate for most households and much cheaper. Blood ketone meters give real-time, more accurate readings and are worth it if you use an insulin pump, have had a previous DKA episode, or take SGLT2 inhibitors.
What should I do if ketones are positive?
Follow the correction-insulin instructions in your written personal sick-day plan and recheck as directed. If you do not have a plan, ketones are rising, or you are vomiting, dehydrated, drowsy or breathing rapidly, seek urgent medical care rather than improvising a dose.
Can DKA happen while I’m asleep?
It can develop overnight, particularly after a missed evening dose or with an unnoticed infection. Waking with nausea, deep breathing, or extreme thirst should prompt immediate glucose and ketone testing.
Is DKA dangerous if treated promptly?
Treated early in hospital, most uncomplicated cases resolve within about 24 hours with a full recovery. The danger comes from delay — outcomes depend heavily on how quickly treatment starts.
Why do I need potassium in hospital when my level looked normal?
Total body potassium is severely depleted in DKA even when the blood level appears normal or high. Once insulin is given, potassium moves rapidly into cells and blood levels can crash — which is why it is replaced and monitored closely.
Final Takeaway: Preventable, With Preparation
DKA remains a leading cause of diabetes hospitalisation in India, yet the majority of episodes trace back to a handful of avoidable situations — insulin stopped during illness, an untreated infection, or ketones never tested. A written sick-day plan, ketone strips in the cupboard, and a family who know the warning signs prevent most of them.
At MCR Diabetes & Eye Care, Kannur, we provide every insulin-treated patient with a written sick-day plan and train family members on recognising the early signs. If you have never been given one — or if you have had a previous DKA episode — book a consultation today.
You May Also Find Helpful
- Hypoglycemia: Symptoms and Emergency Treatment
- Type 1 vs Type 2 Diabetes: Key Differences
- Diabetes Medications Explained
- Monsoon Health Guide for Diabetics in Kerala
Sources and Further Reading
Clinical guidance and evidence reviewed for this article:
- American Diabetes Association: Glycaemic goals and hyperglycaemic crises, Standards of Care 2026
- ADA/EASD and international societies: Hyperglycaemic crises consensus report 2024
- American Diabetes Association: Diabetes care in the hospital, Standards of Care 2026
- ADA laboratory guidance: Ketone testing and diabetes emergencies
This article is for education and does not replace individual medical advice.
