Diabetic Ketoacidosis Management

Initial Assessment and Diagnosis

The American Diabetes Association recommends DKA diagnostic criteria include blood glucose >250 mg/dL, arterial pH <7.3, bicarbonate <15 mEq/L, and moderate ketonemia or ketonuria 1
Direct measurement of β-hydroxybutyrate in blood is preferred over urine ketones for monitoring DKA as the nitroprusside method only measures acetoacetic acid and acetone, not β-hydroxybutyrate (the strongest and most prevalent acid in DKA) 1
Assess for precipitating factors such as infection, trauma, surgery, medication non-adherence, or new-onset diabetes 3

The American Diabetes Association recommends beginning with isotonic saline (0.9% NaCl) to restore circulatory volume and tissue perfusion 1
Initial fluid replacement should be aggressive - typically 15-20 mL/kg/hr (approximately 1-1.5 L) in the first hour 1
After the first hour, continue fluid replacement based on hemodynamic status, typically at 4-14 mL/kg/hr 1
Monitor hydration status frequently to guide ongoing fluid management 1

Start continuous intravenous regular insulin at a dose of 0.1 units/kg/hr after fluid resuscitation has begun 1
If glucose does not fall by 50-75 mg/dL in the first hour, double the insulin infusion rate 1
Once blood glucose reaches 200-250 mg/dL, add dextrose to IV fluids (D5W or D10W) while continuing insulin infusion to prevent hypoglycemia 1
Continue insulin infusion until DKA resolves (pH >7.3, bicarbonate ≥18 mEq/L, and anion gap normalized) 1

Monitor serum potassium levels every 2-4 hours 1
Begin potassium replacement when serum levels fall below 5.2 mEq/L, provided the patient has adequate urine output 1
Typical potassium replacement is 20-30 mEq per liter of IV fluid 1
Monitor phosphate levels and consider replacement if <1.0 mg/dL, especially in patients with cardiac dysfunction, anemia, or respiratory depression 1
Bicarbonate therapy is generally not recommended unless pH is <6.9 1

Check blood glucose every 1-2 hours until stable 2
Monitor electrolytes, blood urea nitrogen, creatinine, and venous pH every 2-4 hours 1
Assess for signs of cerebral edema, particularly in children and adolescents (headache, altered mental status, seizures, bradycardia) 1

Once DKA has resolved (glucose <200 mg/dL, bicarbonate ≥18 mEq/L, pH >7.3), transition to subcutaneous insulin 1
Administer subcutaneous basal insulin 2-4 hours before discontinuing IV insulin to prevent recurrence of ketoacidosis 1
Continue IV insulin infusion for 1-2 hours after starting subcutaneous insulin to ensure adequate plasma insulin levels 1

Identify and treat underlying causes such as infection, trauma, or medication non-compliance 4
Identify and treat underlying causes such as infection, trauma, or medication non-compliance, as recommended by the American Diabetes Association 3

Ensure clear communication with outpatient providers about medication changes and follow-up needs, as recommended by the American Diabetes Association 2
Schedule follow-up appointment before discharge, as recommended by the American Diabetes Association 5

Cerebral edema (more common in children) - treat immediately if suspected, as recommended by the American Diabetes Association 1
Hypoglycemia during treatment - prevent by adding dextrose to IV fluids when glucose <200-250 mg/dL, as recommended by the American Diabetes Association 1
Hypokalemia - monitor closely and replace as needed, as recommended by the American Diabetes Association 1
Recurrence of DKA - prevent with proper transition to subcutaneous insulin, as recommended by the American Diabetes Association 1