At what point should you switch to dextrose-containing fluids in DKA management?

At what point should you switch to dextrose-containing fluids in DKA management?

• A. When glucose nears 300 mg/dL.
• B. When glucose nears 200 mg/dL.
• C. Only after potassium is corrected.
• D. After 12 hours.

Answer: (B)

As you treat DKA, you want insulin to continue driving ketone production to stop and acidosis to resolve, but you must prevent hypoglycemia as glucose falls. Switching to dextrose-containing fluids when blood glucose nears 200 mg/dL achieves this: you keep giving insulin to reverse the ketoacidosis, while the added glucose from the fluids prevents the glucose level from dropping too low. This timing balances ongoing ketolysis with a safe glucose level. Potassium handling matters too: insulin drives potassium into cells, so many protocols ensure potassium is at an acceptable level before starting or continuing insulin; if potassium is very low (<3.3), you wait and correct it first, otherwise you proceed with insulin and add potassium as needed. The other time points—waiting until 300 mg/dL, waiting 12 hours, or only after potassium correction—don’t align with the standard approach of keeping insulin going and adding dextrose around 200 mg/dL to prevent hypoglycemia.

As you treat DKA, you want insulin to continue driving ketone production to stop and acidosis to resolve, but you must prevent hypoglycemia as glucose falls. Switching to dextrose-containing fluids when blood glucose nears 200 mg/dL achieves this: you keep giving insulin to reverse the ketoacidosis, while the added glucose from the fluids prevents the glucose level from dropping too low. This timing balances ongoing ketolysis with a safe glucose level.

Potassium handling matters too: insulin drives potassium into cells, so many protocols ensure potassium is at an acceptable level before starting or continuing insulin; if potassium is very low (<3.3), you wait and correct it first, otherwise you proceed with insulin and add potassium as needed. The other time points—waiting until 300 mg/dL, waiting 12 hours, or only after potassium correction—don’t align with the standard approach of keeping insulin going and adding dextrose around 200 mg/dL to prevent hypoglycemia.