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Internal Medicine›Condition·Updated Apr 17, 2026·v1

DKA Claude

DKA is a metabolic emergency requiring immediate recognition and treatment with IV insulin, balanced crystalloid resuscitation, and electrolyte replacement. Early basal insulin administration significantly improves outcomes. Key monitoring includes glucose, ketones, anion gap, and neurological status. Treatment continues until resolution criteria are met, followed by careful transition to subcutaneous insulin with diabetes education and follow-up.

High Evidence180 references·5,458 words·22 min read·v1
emergency_medicineendocrinologymetabolic_emergencydiabetesketoacidosisinsulincritical_care

Quick Reference

RxDrug of choiceIV insulin infusion 0.1 units/kg/hour + early basal insulin (glargine 0.3 units/kg SC)
AltAlternativesSubcutaneous insulin protocol (SQuID) for mild DKA: glargine 0.25 units/kg + aspart 0.15 units/kg q2h
⊘AvoidSodium bicarbonate (unless pH <6.9), SGLT-2 inhibitors during active DKA, insulin boluses >0.1 units/kg
DxTest of choiceArterial blood gas + anion gap calculation, blood ketones (β-hydroxybutyrate preferred over urine)
ScKey scoreDKA severity: mild (pH 7.25-7.30), moderate (pH 7.0-7.24), severe (pH <7.0) - severe requires ICU
→When to referSevere DKA (pH <7.1), altered mental status, hemodynamic instability, age <2 years, recurrent episodes
Life-threatening metabolic emergency requiring immediate IV insulin, fluid resuscitation with balanced crystalloids, and aggressive electrolyte replacement. Early basal insulin reduces resolution time. Monitor for cerebral edema in children.
Diabetic ketoacidosis (DKA) is a life-threatening metabolic emergency characterized by hyperglycemia, ketosis, and metabolic acidosis. It occurs primarily in patients with type 1 diabetes but can affect those with type 2 diabetes under stress conditions. DKA results from absolute or relative insulin deficiency leading to uncontrolled lipolysis, ketogenesis, and gluconeogenesis. Early recognition and prompt treatment with IV insulin, fluid resuscitation, and electrolyte replacement are crucial for preventing complications including cerebral edema, cardiovascular collapse, and death. The condition requires immediate emergency department evaluation and often ICU-level care for severe cases.

Overview and Recommendations

Background

  • •DKA is a metabolic emergency caused by absolute or relative insulin deficiency, resulting in hyperglycemia (typically >250 mg/dL), ketosis (β-hydroxybutyrate >3.0 mmol/L), and metabolic acidosis (pH <7.3, bicarbonate <15 mEq/L). The condition occurs when insulin deficiency triggers uncontrolled lipolysis and ketogenesis.
  • •Type 1 diabetes accounts for the majority of DKA cases, but type 2 diabetes patients can develop DKA during severe stress, illness, or with certain medications. can cause euglycemic DKA where glucose levels may be normal or only mildly elevated.
  • •Common precipitants include infection (most common), medication non-adherence, new-onset diabetes, cardiovascular events, and psychological stress. Up to 30% of cases occur at initial diabetes diagnosis, particularly in children under 2 years who have the highest risk of severe presentation.
  • •Mortality ranges from 1-5% in developed countries but remains higher in resource-limited settings. Complications include cerebral edema (particularly in children), cardiovascular collapse, acute kidney injury, and electrolyte disturbances.
  • •The classic triad of polyuria, polydipsia, and weight loss may be preceded by nausea, vomiting, abdominal pain, and altered mental status. Kussmaul respirations (deep, rapid breathing) represent compensatory hyperventilation for metabolic acidosis.

Evaluation

  • •Suspect DKA in any patient with diabetes presenting with nausea, vomiting, abdominal pain, or altered mental status. Maintain high suspicion in patients taking even with normal glucose levels (euglycemic DKA).
  • •Obtain immediate point-of-care glucose and ketones (blood ketones preferred over urine). Blood glucose >250 mg/dL with ketones >1.5 mmol/L strongly suggests DKA, but euglycemic variants exist.
  • •Order arterial blood gas immediately - pH <7.3 with anion gap >12 mEq/L confirms metabolic acidosis. Calculate anion gap: [Na+] - ([Cl-] + [HCO3-]). Normal anion gap is 8-12 mEq/L.
  • •Assess severity using pH and bicarbonate: mild DKA (pH 7.25-7.30, HCO3- 15-18 mEq/L), moderate DKA (pH 7.0-7.24, HCO3- 10-14 mEq/L), severe DKA (pH <7.0, HCO3- <10 mEq/L). Severe DKA requires ICU admission.
  • •Evaluate hemodynamic status carefully - patients often present with significant dehydration and may have hypotension (systolic BP <90 mmHg). Assess for signs of shock including tachycardia, poor capillary refill, and altered mental status.
  • •Perform comprehensive metabolic panel including electrolytes, BUN, creatinine, and phosphorus. Check serum osmolality if concerned for concurrent . Obtain CBC to evaluate for infection or hemoconcentration.
  • •Assess neurological status using Glasgow Coma Scale and examine for signs of cerebral edema (headache, altered mental status, focal deficits). Children and young adults have highest risk for this life-threatening complication.
  • •Identify precipitating factors through history and examination: recent illness, medication changes, insulin omission, new stressors. Obtain cultures (blood, urine) if infection suspected. Consider cardiac evaluation if chest pain or ECG changes present.
  • •Monitor for concurrent conditions: (subcutaneous emphysema), (nasal lesions), or other serious infections that may complicate DKA and require immediate intervention.
  • •Document baseline vital signs, mental status, and fluid balance for monitoring treatment response. Establish IV access (preferably two large-bore IVs) and consider central access for severe cases or difficult peripheral access.

Management

  • •Initiate IV insulin infusion at 0.1 units/kg/hour after confirming serum potassium >3.3 mEq/L. Do not give insulin bolus routinely as it provides no additional benefit and increases hypoglycemia risk.
  • •Begin fluid resuscitation with 15-20 mL/kg IV bolus over first hour. Balanced crystalloids are superior to normal saline, reducing time to DKA resolution and preventing hyperchloremic acidosis.
  • •Administer early basal insulin (glargine 0.3 units/kg subcutaneously) within 3 hours of diagnosis. This intervention reduces DKA resolution time from 10.2 to 6.8 hours and decreases rebound hyperglycemia.
  • •Replace potassium aggressively: if K+ 3.3-5.2 mEq/L, add 20-30 mEq KCl per liter of IV fluid. If K+ <3.3 mEq/L, hold insulin until corrected and give 40 mEq KCl. Monitor every 2 hours initially.
  • •Switch to dextrose-containing fluids (D5 lactated Ringer's) when glucose falls below 250 mg/dL to prevent hypoglycemia while continuing insulin to clear ketones. Reduce insulin infusion to 0.05 units/kg/hour at this point.
  • •Monitor glucose, electrolytes, and anion gap every 2 hours initially. Target glucose decline of 50-75 mg/dL per hour. Maintain glucose 150-250 mg/dL during active treatment to allow continued ketone clearance.
  • •Avoid sodium bicarbonate unless pH <6.9, as it increases cerebral edema risk and delays ketone clearance. When indicated, give 100 mEq in 400 mL sterile water over 2 hours.
  • •Continue treatment until DKA resolution: anion gap <12 mEq/L, bicarbonate >15 mEq/L, pH >7.30, and ketones <0.6 mmol/L. Patient must also be alert and able to tolerate oral intake.
  • •Transition to subcutaneous insulin when resolution criteria met: calculate total daily dose (0.5-0.8 units/kg/day), give 50% as basal and 50% as prandial insulin. Continue IV insulin for 1-2 hours after first subcutaneous dose.
  • •Admit severe DKA (pH <7.1) to ICU. Mild-moderate DKA can be managed on medical floors with appropriate protocols. Consider subcutaneous insulin protocols (SQuID) for mild DKA in stable patients.
  • •Identify and treat precipitating factors: start antibiotics for suspected infection, review medication adherence, address psychosocial stressors. Discontinue if present.
  • •Provide diabetes education before discharge: sick day management, ketone monitoring, when to seek care, medication adherence. Arrange endocrinology follow-up within 1-2 weeks and ensure access to glucose/ketone monitoring supplies.
  • •Monitor for complications: cerebral edema (especially in children), acute kidney injury, cardiac arrhythmias from electrolyte shifts, and treatment-related hypoglycemia or hypokalemia.
  • •Consider continuous glucose monitoring initiation before discharge to reduce future DKA risk. Patients with recurrent DKA benefit from diabetes technology and intensive management programs.

Board Review — High Yield

  • •Euglycemic DKA — occurs with SGLT-2 inhibitors, pregnancy, or starvation; glucose may be normal but ketones and acidosis present
  • •Kussmaul respirations — deep, rapid breathing compensating for metabolic acidosis; do not suppress with sedation
  • •Cerebral edema — most feared complication in children; presents with headache, altered mental status, bradycardia with hypertension
  • •Early basal insulin — glargine 0.3 units/kg within 3 hours reduces DKA resolution time by 3-4 hours
  • •Lactated Ringer's superior — to normal saline for DKA; faster anion gap closure and less hyperchloremic acidosis
  • •Potassium replacement critical — insulin drives K+ intracellularly; hold insulin if K+ <3.3 mEq/L
  • •Bicarbonate contraindicated — unless pH <6.9; increases cerebral edema risk and delays ketone clearance
  • •Resolution criteria — anion gap <12, HCO3- >15, pH >7.30, ketones <0.6 mmol/L, alert mental status
  • •Insulin transition — continue IV insulin 1-2 hours after first subcutaneous dose to prevent rebound ketosis

Deep Dive — Evidence Details

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