Diabetic Ketoacidosis (DKA) Treatment Protocol
DKA management requires prompt IV fluid resuscitation, continuous insulin infusion to suppress ketogenesis, and potassium-guided electrolyte replacement with frequent reassessment JBDS DKA Guideline (2021).
Intravenous bicarbonate is not indicated for routine DKA because fluid and insulin therapy resolve the acidosis JBDS DKA Guideline (2021).
Step 1: Diagnosis Confirmation and Immediate Stabilization
DKA is diagnosed by hyperglycemia with metabolic acidosis and ketonemia/ketonuria (e.g., plasma glucose >250 mg/dL plus arterial pH <7.30, venous pH <7.25, serum bicarbonate <15–18 mmol/L, and elevated anion gap) UNC Adult DKA/HHS Adult Guidelines (PDF).
Immediate care includes reassessment and vital sign monitoring with frequent observation early in treatment JBDS DKA Guideline (2021).
Step 2: Initial Laboratory Panel and Monitoring Schedule
Hourly glucose is recommended during the initial phase, with hourly ketone monitoring when available JBDS DKA Guideline (2021).
Venous blood gas for pH, bicarbonate, and potassium is recommended at 60 minutes, 2 hours, and then every 2 hours thereafter JBDS DKA Guideline (2021).
Fluid balance monitoring is recommended with a minimum urine output target of ≥0.5 mL/kg/hr JBDS DKA Guideline (2021).
Step 3: IV Fluid Resuscitation
Initial fluid resuscitation is recommended to restore intravascular volume and improve perfusion while monitoring for over-resuscitation risk JBDS DKA Guideline (2021).
Potassium is handled in parallel with fluids so that serum potassium remains in the normal range during insulin therapy JBDS DKA Guideline (2021).
Step 4: Potassium Management Before and During Insulin
Insulin should not be started until potassium replacement is initiated if serum K+ is <3.3 mEq/L UNC Adult DKA/HHS Adult Guidelines (PDF).
Potassium monitoring and replacement are mandatory because serum potassium often falls rapidly once insulin is started JBDS DKA Guideline (2021).
A commonly used strategy is 0.9% sodium chloride with potassium 40 mmol/L when serum potassium is <5.5 mmol/L and the patient is passing urine JBDS DKA Guideline (2021).
Potassium replacement should be withheld (“nil”) when serum potassium is >5.5 mmol/L JBDS DKA Guideline (2021).
When serum potassium is <3.5 mmol/L, senior review is recommended for additional potassium needs JBDS DKA Guideline (2021).
Step 5: Insulin Therapy
A fixed-rate intravenous insulin infusion is recommended for DKA JBDS DKA Guideline (2021).
An insulin infusion rate of 0.1 units/kg/hr is recommended in the emergency department protocol UNC Adult DKA/HHS Adult Guidelines (PDF).
Bolus insulin (0.1 units/kg) may be considered if delay occurs before starting the infusion JBDS DKA Guideline (2021) and UNC Adult DKA/HHS Adult Guidelines (PDF).
Insulin is titrated to achieve ketone clearance and metabolic improvement rather than glucose lowering alone JBDS DKA Guideline (2021).
Step 6: Dextrose Addition and Insulin Dose Adjustment
When glucose falls (e.g., <14 mmol/L), a reduction in insulin infusion rate to 0.05 units/kg/hr is recommended and glucose-containing fluids are initiated alongside insulin to prevent hypoglycemia JBDS DKA Guideline (2021).
If ketones are not falling at the target rate, insulin infusion rate is increased in hourly increments and causes such as infusion pump malfunction are checked JBDS DKA Guideline (2021).
If ketones are not falling as expected and blood ketones measurement is not available, venous bicarbonate rise is used to guide escalation JBDS DKA Guideline (2021).
Step 7: Ongoing Goals and Expected Response
The treatment goal during the early phase is ketone fall of at least 0.5 mmol/L/hr, or bicarbonate rise of 3 mmol/L/hr, with blood glucose fall of 3 mmol/L/hr JBDS DKA Guideline (2021).
Serum potassium is maintained in the normal range during insulin therapy JBDS DKA Guideline (2021).
Venous blood gas is used to verify acidosis resolution because glucose alone is not an accurate indicator of resolution of ketoacidosis JBDS DKA Guideline (2021).
Step 8: Criteria for Resolution and Transition to Subcutaneous Insulin
DKA resolution is defined as ketones <0.6 mmol/L and venous pH >7.3 JBDS DKA Guideline (2021).
Intravenous insulin infusion is not discontinued until after subcutaneous short-acting insulin is given JBDS DKA Guideline (2021).
Conversion to subcutaneous insulin is recommended when biochemically stable (ketones <0.6 mmol/L and pH >7.3) and the patient is ready and able to eat JBDS DKA Guideline (2021).
The subcutaneous fast-acting insulin is ideally administered at a meal, followed by discontinuation of the intravenous insulin infusion 30–60 minutes later JBDS DKA Guideline (2021).
Step 9: Bicarbonate and Trigger Management
Routine IV bicarbonate use is not indicated because adequate fluid and insulin therapy resolves DKA acidosis JBDS DKA Guideline (2021).
The precipitating cause should be identified and treated because failure to resolve DKA should prompt evaluation for treatment failure and underlying drivers JBDS DKA Guideline (2021).