Diabetic ketoacidosis (DKA) initial stabilization and treatment
DKA management is a protocol-driven sequence of fluids, insulin, and potassium repletion with frequent laboratory monitoring until resolution criteria are met [1], JBDS 2023, UNC Adult DKA/HHS Guideline.
DKA should be treated as an emergency condition requiring continuous vital-sign assessment and frequent reassessment of neurologic status, hydration status, and acid-base response UNC Adult DKA/HHS Guideline.
Immediate assessment and diagnostic confirmation
DKA should be confirmed with hyperglycemia plus metabolic acidosis and ketosis, using venous blood gas or arterial blood gas, serum electrolytes, and serum/urine ketones to guide therapy and monitoring [1], UNC Adult DKA/HHS Guideline.
Concurrently, the likely precipitant should be identified and treated (infection, missed insulin, myocardial infarction, stroke, pancreatitis, medication nonadherence, other stressors) [1], UNC Adult DKA/HHS Guideline.
Fluid resuscitation strategy
Initial isotonic crystalloid is recommended to treat hypovolemia and improve renal perfusion and clearance of glucose and ketones [1], UNC Adult DKA/HHS Guideline.
Typical adult protocols use an initial IV bolus of approximately 15–20 mL/kg of normal saline early in treatment, followed by ongoing IV fluid therapy based on hemodynamics, urine output, and electrolyte trends [1], UNC Adult DKA/HHS Guideline.
Insulin therapy for ketone suppression
IV regular insulin is used as fixed-rate continuous infusion in uncomplicated DKA to suppress ketogenesis and correct the anion-gap metabolic acidosis [1], JBDS 2023, UNC Adult DKA/HHS Guideline.
A common adult regimen is 0.1 units/kg IV bolus followed by 0.1 units/kg/hour infusion, or start with an infusion (no bolus) depending on local protocol [1], UNC Adult DKA/HHS Guideline, [2].
Insulin infusion should be continued while the anion gap is closing and until ketoacidosis resolution criteria are met JBDS 2023, UNC Adult DKA/HHS Guideline.
Potassium replacement and electrolyte monitoring
Potassium replacement is integrated with insulin initiation because total body potassium is depleted despite serum potassium that may be normal or elevated initially [1], UNC Adult DKA/HHS Guideline.
Insulin should be started only after ensuring serum potassium is not critically low, using local protocol thresholds (frequent monitoring supports safe potassium repletion during insulin-induced intracellular shift) [2], UNC Adult DKA/HHS Guideline.
Electrolytes should be checked frequently, including potassium and often phosphate and magnesium, with replacement guided by measured deficits and clinical status JBDS 2023, UNC Adult DKA/HHS Guideline.
Glucose titration during insulin infusion
When serum glucose decreases to a lower threshold (commonly ~200 mg/dL in adult protocols), dextrose should be added to IV fluids to allow continued insulin delivery while preventing hypoglycemia [1], [3].
Insulin infusion rate should be adjusted downward when glucose approaches the target range while continuing treatment of ketosis and acidosis [1], JBDS 2023.
Bicarbonate and adjunctive therapies
Sodium bicarbonate is not routine therapy for DKA in adults and is reserved for specific severe acidemia scenarios per protocol-driven practice and published guidance [1], [2].
Phosphate and magnesium replacement should be considered when laboratory values show significant deficiency or when protocols support replacement, with ongoing monitoring for complications from electrolyte repletion JBDS 2023, UNC Adult DKA/HHS Guideline.
Resolution criteria, insulin transition, and discharge planning
DKA resolution is typically defined by closure of ketoacidosis, operationalized by improvement in blood pH and bicarbonate and resolution of ketosis, using protocol-specific criteria (for example bicarbonate recovery and normalization of pH with improving anion gap/ketones) [2], JBDS 2023.
Conversion from IV insulin to subcutaneous insulin should be coordinated with specialist or protocol guidance to prevent rebound hyperglycemia and recurrent ketosis JBDS 2023.
Discharge planning should include management of the precipitating factor, insulin regimen selection, patient education for sick-day rules and ketone monitoring, and follow-up for glycemic control and prevention of recurrence [1], JBDS 2023.