Clinical Guides
Diabetic Ketoacidosis
A clinically focused adult emergency guide to recognising diabetic ketoacidosis, restoring circulation, replacing potassium safely, suppressing ketogenesis with insulin, treating the precipitant and preventing recurrence in Indian practice.
MedNext Academy | 13 min read
Diabetic Ketoacidosis
A clinically focused adult emergency guide to recognising diabetic ketoacidosis, restoring circulation, replacing potassium safely, suppressing ketogenesis with insulin, treating the precipitant and preventing recurrence in Indian practice.
Summary
Diabetic ketoacidosis (DKA) is an acute metabolic emergency caused by insufficient effective insulin together with counter-regulatory hormone excess. The defining disturbance is ketone production with metabolic acidosis; glucose may be markedly raised, modestly raised or, particularly with sodium-glucose cotransporter-2 (SGLT2) inhibitor exposure, below the traditional hyperglycaemic range. The 2024 international consensus requires diabetes or glucose at least 200 mg/dL (11.1 mmol/L), elevated ketones and metabolic acidosis, with all three components present. A bedside glucose result alone therefore cannot confirm or exclude DKA.
Priorities are simultaneous: assess airway, breathing, circulation and mental state; obtain venous blood gas, electrolytes, renal function, glucose and blood beta-hydroxybutyrate; begin monitored isotonic fluid; determine potassium before or alongside insulin decisions; continue appropriate basal insulin; and find the precipitating illness. Intravenous short-acting insulin suppresses ketogenesis, while dextrose is added as glucose falls so insulin can continue until ketoacidosis resolves. Potassium commonly falls during treatment even when the presenting value is normal or high.
DKA care is a closed-loop process, not a fixed recipe. Record hourly physiology and biochemical response, adjust fluid for shock, renal or cardiac disease, avoid bicarbonate except exceptional severe acidaemia under senior protocol, and use resolution criteria rather than glucose normalization. Severe DKA, altered consciousness, shock, pregnancy, mixed DKA-HHS or inability to provide frequent monitoring warrants critical-care involvement. This draft supports supervised education and must be reconciled with the hospital's current adult pathway.
How Common Is It?
DKA occurs in people with type 1 diabetes, type 2 diabetes, ketosis-prone diabetes and less common diabetes phenotypes. It may be the first presentation of diabetes or a complication of known disease. The 2024 consensus describes rising adult hyperglycaemic-crisis admissions in several countries, but incidence varies greatly by case definition, health system and population. It reports that most DKA events in cited datasets occurred among younger adults and people with type 1 diabetes; these observations must not be converted into an Indian national incidence estimate. Indian burden is incompletely captured across public, private, rural and tertiary services.
Recurrence matters clinically. Previous DKA, missed insulin, difficulty obtaining supplies, disordered eating, depression, substance use, low health literacy, unstable housing, intercurrent infection and inadequate follow-up identify preventable risk. Repeated admissions should trigger a structured exploration of access and psychosocial causes, not the label of non-compliance. Pumps and automated delivery systems reduce some burdens but interruption of rapid-acting insulin can permit ketosis to develop quickly.
Mortality from treated DKA in well-resourced adult services is now generally low, yet avoidable deaths still occur through delayed recognition, potassium errors, cerebral oedema, shock, sepsis and gaps during transition from intravenous to subcutaneous insulin. Outcomes are worse where laboratory turnaround, infusion pumps, trained nursing or transfer are limited. Local audit should therefore measure time to ketone testing, potassium safety, resolution, hypoglycaemia, readmission and documented prevention planning rather than borrow a headline rate from another country. Many treatment recommendations are consensus-based rather than supported by large, generalisable randomised trials, so protocol audit and clinical judgement remain essential.
Risk Factors
The two dominant precipitants are insulin omission or inadequate delivery and acute illness, especially infection. Ask why insulin was missed: cost, stock-out, travel, fasting, vomiting, misunderstanding of sick-day rules, fear of hypoglycaemia, injection pain, stigma, device failure, deliberate restriction for weight control or a mental-health crisis. Never assume intent. Newly diagnosed diabetes, recent dose reduction, pump cannula displacement, spoiled insulin from heat or interrupted refrigeration, and failure to increase monitoring during illness all increase risk.
Physiological stressors include pneumonia, urinary or skin infection, tuberculosis, pancreatitis, myocardial infarction, stroke, trauma, surgery and pregnancy. Glucocorticoids, sympathomimetics, atypical antipsychotics and some immunotherapies can contribute through hyperglycaemia or altered insulin need. SGLT2 inhibitors are particularly important because DKA may occur with glucose below 200 mg/dL; risk rises with fasting, very-low-carbohydrate intake, dehydration, acute illness, surgery, pregnancy or reduced insulin. Ask directly about combination tablets and brand names.
Vulnerability is amplified by prior DKA, high HbA1c, adolescence or young adulthood, cognitive impairment, alcohol or stimulant use, food insecurity and absence of a reachable diabetes team. In India, long travel, out-of-pocket expenditure, counterfeit or poorly stored insulin, interrupted electricity and limited ketone-strip access may delay recognition. These are hypotheses to assess in the individual, not stereotypes. Prevention requires reliable insulin, needles, glucose testing, culturally and linguistically usable sick-day education, ketone access where feasible, and a clear emergency contact route.
Diagnosis
History
Establish diabetes type, usual insulin and last doses, pump function, SGLT2 inhibitor use, glucose and ketone trends, vomiting, polyuria, polydipsia, weight loss, abdominal pain, fever, cough, dysuria, wounds, chest pain, pregnancy possibility and recent fasting, surgery or substance exposure. Symptoms often evolve over hours to a few days. Ask about prior DKA and barriers without blame.
Examination
Assess airway, respiratory effort, oxygenation, pulse, blood pressure, perfusion, temperature, hydration and Glasgow Coma Scale. Deep Kussmaul respiration and acetone odour support acidosis but are neither required nor specific. Look for shock, focal infection, peritonism, myocardial ischaemia, stroke, pregnancy complications and infusion-site failure. Abdominal tenderness may accompany DKA; persistent focal signs after resuscitation require another diagnosis.
Investigations
Measure capillary glucose immediately, but diagnose using venous pH or bicarbonate and preferably quantitative blood beta-hydroxybutyrate. The 2024 consensus uses beta-hydroxybutyrate at least 3.0 mmol/L and pH below 7.3 and/or bicarbonate below 18 mmol/L with diabetes or glucose at least 200 mg/dL. Obtain sodium, potassium, chloride, urea, creatinine, phosphate as indicated, full blood count, ECG and pregnancy test where relevant. Calculate anion gap as supporting information, not the preferred resolution marker, because chloride-rich fluid may produce normal-gap acidosis. Corrected sodium and measured or calculated osmolality help identify mixed DKA-HHS. Culture and imaging should follow clinical suspicion; leukocytosis alone does not prove infection.
Differential Diagnosis
Starvation ketosis usually follows prolonged low intake and produces ketosis with normal or low glucose; acidosis is often less severe, but pregnancy and concurrent illness can blur the distinction. Alcoholic ketoacidosis follows heavy alcohol exposure and poor intake, often with vomiting, variable glucose and important thiamine, magnesium and withdrawal considerations. Lactic acidosis from shock, sepsis, seizures, hypoxia, metformin accumulation or toxins may coexist with DKA. Measure lactate when physiology suggests it rather than treating an elevated anion gap as automatically ketotic.
Toxic alcohol ingestion, salicylate toxicity, renal failure and advanced hepatic disease cause high-gap acidosis through different mechanisms. A toxin history may be absent; examine osmolal gap, visual symptoms, tinnitus, respiratory pattern, renal injury and exposure opportunity. Sepsis can independently produce hyperglycaemia and acidosis. Euglycaemic DKA must remain in the differential when an SGLT2 inhibitor, pregnancy or fasting is present despite a reassuring glucose value.
HHS is distinguished by marked hyperosmolality and usually absent severe ketonaemia or acidosis, but more than one-third of hyperglycaemic crises may have overlapping features. Mixed DKA-HHS needs DKA-dose insulin with careful HHS-style control of tonicity. Other explanations for vomiting or abdominal pain include pancreatitis, appendicitis, obstruction, pregnancy-related disease and myocardial infarction. Do not attribute reduced consciousness solely to DKA until hypoglycaemia, stroke, meningitis, intoxication, hypoxia and severe hyperosmolality have been considered.
Management
Begin resuscitation where observations, glucose, electrolytes and infusion delivery can be repeated reliably. In adults without cardiac or renal compromise, the 2024 consensus supports isotonic saline or balanced crystalloid at 500-1,000 mL/hour for the first 2-4 hours, then individualisation using haemodynamics, sodium and fluid balance. Shock requires an emergency resuscitation approach. Older people, pregnancy, heart failure, kidney disease and dialysis need smaller aliquots and frequent examination; neither a universal litre target nor forced urine output is safe.
Check potassium before insulin when possible. If potassium is below 3.5 mmol/L, replace potassium and defer insulin until it rises because insulin can precipitate arrhythmia or respiratory weakness. With potassium below 5.0 mmol/L, the consensus commonly adds 20-30 mmol potassium per litre to maintain about 4-5 mmol/L; follow local concentrations, line restrictions and repeat assays. Start intravenous short-acting insulin, commonly 0.1 units/kg/hour, when potassium permits. A bolus is unnecessary if infusion begins promptly. Continue the patient's usual basal insulin unless a specialist-directed reason exists.
When glucose falls below 250 mg/dL (13.9 mmol/L), add 5-10% dextrose and reduce insulin, commonly to 0.05 units/kg/hour, so ketone clearance continues without hypoglycaemia. Seek a ketone fall around 0.5 mmol/L/hour or bicarbonate rise around 3 mmol/L/hour under JBDS monitoring, while reassessing delivery and precipitant if targets fail. Treat infection, infarction or device failure. DKA resolves with ketone below 0.6 mmol/L and venous pH at least 7.3 or bicarbonate at least 18 mmol/L; glucose should ideally be below 200 mg/dL. Do not use urine ketone clearance or anion gap alone.
Prescribing Information
Use soluble or another approved short-acting insulin through a dedicated, clearly labelled infusion with an infusion pump wherever possible. Verify body weight, concentration, units per hour, cannula patency and pump programming independently according to institutional policy. Never abbreviate units ambiguously. If an infusion pump is unavailable, use only a locally authorised monitored alternative; improvised dosing without frequent glucose, potassium and acid-base assessment is unsafe. Subcutaneous rapid-acting analogues may be used for selected uncomplicated mild or moderate DKA in closely observed services, but not severe DKA, shock, HHS overlap or unreliable follow-up.
Potassium chloride is a high-alert medicine. Confirm urine and renal status, recent potassium, permitted peripheral or central concentration, infusion rate and cardiac-monitoring requirement. Do not administer potassium by intravenous push. Recheck potassium two hours after insulin starts and about every four hours thereafter, or more frequently when abnormal. Routine phosphate replacement has not improved outcomes; consider it for severe hypophosphataemia with respiratory, cardiac or muscle compromise using a protocol that also monitors calcium.
Bicarbonate is not routine because insulin and volume restoration correct ketoacidosis and bicarbonate may worsen hypokalaemia and other harms. The international consensus reserves consideration for severe acidaemia, such as pH below 7.0, with senior critical-care oversight. Dextrose is an enabling treatment, not a declaration that DKA is resolved. Stop SGLT2 inhibitors during the crisis and reconsider future use after specialist risk review. Empirical antimicrobials require a clinical indication and local antimicrobial policy; fever, cultures, imaging and source control guide therapy.
When to Refer
Involve the diabetes or endocrinology team early for every admitted DKA episode to supervise transition, phenotype, education and prevention. Critical-care review is urgent for severe acidosis, altered consciousness, shock, hypoxaemia, oliguria, dangerous potassium, suspected cerebral oedema, major comorbidity, pregnancy, mixed DKA-HHS, sepsis requiring organ support or failure of ketones and bicarbonate to improve despite verified treatment. A patient managed outside ICU still needs nurse staffing and laboratory access appropriate to the monitoring schedule.
Transfer from a facility without blood gas, quantitative ketones, serial electrolytes, infusion control or overnight clinical observation should begin early. Stabilise airway and circulation, obtain glucose and potassium, start carefully documented isotonic fluid, and communicate insulin and potassium already given. Do not delay transport to complete every test. The referral must include weights if known, serial vital signs, mental state, urine output, glucose, pH, bicarbonate, ketones, sodium, potassium, osmolality, pregnancy status, medicines and suspected precipitant.
Seek obstetric and specialist diabetes care immediately in pregnancy because fetal compromise reflects maternal physiology and fluid treatment needs close supervision. Paediatric DKA follows paediatric protocols; cerebral oedema risk and fluid strategy differ. Cardiology, surgery, infectious diseases, toxicology or psychiatry may be needed for the trigger, but one senior clinician must coordinate. Before discharge, ensure the patient can obtain insulin and monitoring supplies, can demonstrate sick-day actions and has a named follow-up contact; unresolved access is a clinical referral issue.
Red Flags
Hypotension, poor perfusion, hypoxia, falling consciousness, seizures, focal neurology, severe abdominal signs, oliguria, arrhythmia and potassium below 3.5 or markedly above the laboratory range require immediate senior review. A normal initial potassium is not reassuring because total-body potassium is depleted and the measured concentration usually falls with insulin and correction of acidosis. Unexpected weakness, ectopy or a rapid potassium change should prompt ECG and urgent repeat sampling, while excluding haemolysis.
Cerebral oedema is rare in adults but catastrophic. New headache, irritability, bradycardia, rising blood pressure, incontinence, cranial-nerve signs, reduced consciousness or seizure during treatment demands immediate critical-care and neuroimaging assessment without delaying emergency action under local protocol. Avoid excessively rapid osmotic shifts, especially when DKA overlaps with HHS. The 2024 consensus advises that glucose generally should not fall faster than about 90-120 mg/dL/hour in HHS; calculate osmolality when overlap is plausible.
Persistent acidosis or ketonaemia may reflect an interrupted insulin line, wrong concentration, inadequate dose, ongoing sepsis, tissue hypoperfusion or a second acid load. Recheck the patient and delivery system before reflex escalation. Sudden hypoxaemia may indicate pulmonary oedema, aspiration, pneumonia or thromboembolism. Chest pain needs ECG and troponin interpretation in context. Severe hypoglycaemia, fluid overload, hyperchloraemic acidosis and acute kidney injury are treatment complications, not evidence that therapy must simply continue unchanged. Anuria, refractory hyperkalaemia or pulmonary oedema warrants renal and critical-care assessment.
Indian Clinical Context
Indian practice ranges from diabetes centres with bedside beta-hydroxybutyrate and critical-care pumps to facilities relying on urine ketones and intermittently available electrolytes. A safe pathway must define the minimum monitoring capacity for local care and a transfer trigger before deterioration. Where blood ketones are unavailable, urine ketones can support initial suspicion but lag during recovery and cannot safely determine resolution. Venous blood gas is generally adequate for pH. A laboratory result without a reliable collection time, unit or sample-quality check should not drive a high-risk potassium decision.
Ask about insulin storage during heat and travel, access to refrigeration, power cuts, affordability, needle supply, reuse, fasting practices, local-language education and use of unlabelled remedies. Explore tuberculosis, dengue, malaria, urinary infection, pneumonia and skin or foot infection according to season and exposure rather than ordering an indiscriminate fever panel. Antimicrobial choice must follow local resistance data. Do not imply that any infection is proven by leukocytosis alone.
If infusion pumps or ICU beds are constrained, triage must be explicit: altered consciousness, shock, severe acidosis, pregnancy, dangerous potassium and HHS overlap have priority for higher-level monitoring. Use a written hour-by-hour chart for fluid, insulin, potassium, glucose, ketones or bicarbonate, vital signs and urine. During transfer, secure insulin continuity and avoid unrecorded boluses. Discharge prevention should include an affordable prescription, spare insulin plan, sick-day card, ketone-testing strategy appropriate to resources and an early appointment. ICMR provides Indian type 1 diabetes guidance, but local hospitals must maintain an adult DKA protocol and audit it.
NMC Competency Mapping
The NMC CBME Curriculum 2024 expects the undergraduate to integrate endocrine pathophysiology, clinical recognition, investigation and emergency management rather than memorise an isolated infusion rate. DKA maps directly to Medicine competency IM11.15, which requires recognition of diabetic emergencies and an outline of therapeutic principles. IM11.9 covers their clinical features, IM11.11 covers relevant laboratory interpretation, IM11.13 covers urinary ketone testing and IM11.16 covers diabetes pharmacotherapy. The learner should explain how insulin deficiency increases lipolysis and hepatic ketogenesis, why extracellular potassium may mask total-body depletion, and how osmotic diuresis produces water and electrolyte loss.
At the bedside, a supervised learner should elicit insulin access and sick-day history, recognise Kussmaul breathing and dehydration, interpret glucose, beta-hydroxybutyrate, venous pH, bicarbonate, anion gap, sodium, potassium and osmolality, and identify a precipitating illness. They should be able to distinguish DKA from HHS and other high-gap acidoses, flag euglycaemic DKA, calculate weight-based infusion rates and document monitoring goals. Prescribing insulin or concentrated potassium independently remains beyond an unsupervised student's role.
Skill assessment can use a simulated emergency handover: state severity, initial fluid, potassium constraint, insulin plan, biochemical trajectory, suspected cause and need for escalation. Communication includes non-judgmental exploration of missed insulin, explaining why dextrose may be required despite diabetes, and teaching sick-day rules through teach-back. Curriculum mapping does not establish that this draft has completed clinical review, replace institutional protocols or authorise a learner to manage DKA without senior supervision.
Key Exam Pearls for NEET PG
DKA requires three elements: diabetes or glucose at least 200 mg/dL, ketosis and metabolic acidosis. The preferred ketone is blood beta-hydroxybutyrate at least 3.0 mmol/L. Acidosis is venous pH below 7.3 and/or bicarbonate below 18 mmol/L. Glucose may be below 200 mg/dL in euglycaemic DKA, especially with SGLT2 inhibitor use, pregnancy or reduced intake. Nitroprusside urine tests detect acetoacetate rather than beta-hydroxybutyrate, so they can underestimate early severity and remain positive during recovery.
Total-body potassium is depleted even when serum potassium is high. Defer insulin and replace potassium when it is below 3.5 mmol/L under the 2024 consensus. Insulin suppresses ketogenesis; fluid alone does not. Add dextrose as glucose approaches 250 mg/dL so insulin can continue. Resolution is ketone below 0.6 mmol/L plus pH at least 7.3 or bicarbonate at least 18 mmol/L, ideally with glucose below 200 mg/dL. Do not wait for urine ketones to disappear.
Anion gap helps recognition but hyperchloraemic acidosis after saline can keep bicarbonate low; direct ketones and pH are better resolution markers. Routine bicarbonate is not indicated, and routine phosphate replacement does not improve outcomes. Continue basal insulin and overlap subcutaneous insulin with intravenous insulin by about one to two hours, adapting to the regimen and institutional policy. Always identify the precipitant: infection and insulin interruption are common, but infarction, pancreatitis, pregnancy, drugs and device failure matter.
Frequently Asked Questions
Can diabetic ketoacidosis occur when blood glucose is not very high?
Yes. Euglycaemic DKA has ketosis and metabolic acidosis with glucose below 200 mg/dL. It is particularly associated with SGLT2 inhibitors, pregnancy, fasting or reduced carbohydrate intake, and partial insulin treatment. A normal-looking glucose must not stop ketone and venous acid-base testing when symptoms and risk fit. Treatment still requires monitored fluid, potassium assessment, insulin and early dextrose so ketogenesis can be suppressed safely.
Why is dextrose given while treating a hyperglycaemic emergency?
Glucose often normalises before ketonaemia and acidosis resolve. Stopping insulin at that point allows ongoing lipolysis and ketone production. Adding intravenous dextrose prevents hypoglycaemia while a lower insulin infusion continues to clear ketones. The decision follows glucose and biochemical response; dextrose is not evidence that treatment has failed, and it does not replace continued potassium and acid-base monitoring.
When should intravenous insulin be delayed in diabetic ketoacidosis?
If serum potassium is below 3.5 mmol/L, the 2024 consensus advises potassium replacement before insulin because insulin shifts potassium into cells and can provoke dangerous arrhythmia or respiratory weakness. Insulin may also be briefly deferred while immediate shock resuscitation and a trustworthy potassium result are obtained. These decisions require repeated sampling, ECG assessment when indicated and a protocol defining replacement concentration and rate.
How can another episode of diabetic ketoacidosis be prevented after discharge?
Prevention starts by identifying the actual cause: infection, insufficient insulin, pump interruption, inability to pay, supply or storage failure, fasting, fear of hypoglycaemia, mental illness or misunderstanding. Provide an affordable insulin and equipment plan, written sick-day rules, glucose and ketone actions, emergency contact details and early diabetes follow-up. Use teach-back, involve family with consent, and do not discharge until basal insulin continuity is secure.
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