Glucose Management Practice Test

Potassium management in DKA hinges on how treatment affects potassium distribution in the body. In DKA, total body potassium is typically depleted because of osmotic diuresis and losses, even if a patient’s blood K+ looks normal or high at presentation. When you start insulin therapy and gradually correct acidosis, potassium shifts back into cells, which can cause the serum potassium to fall quickly. If the sodium and water status are corrected, and insulin is started while potassium is allowed to fall, you risk severe hypokalemia.

So when the potassium is in the range of 3.3 to 5.0 mEq/L, the best approach is to add potassium to the IV fluids (commonly about 20–30 mEq per liter of fluid) to maintain serum potassium in a safe range (target roughly 4–5 mEq/L) during treatment. This helps prevent a dangerous drop once insulin is given and the shift into cells occurs.

If potassium were very low (below 3.3), insulin is held and potassium is given more aggressively first; if it’s high (above 5.0), potassium replacement is typically not started until levels drop. The key idea is that IV potassium during this potassium range protects against insulin-driven falls and supports safe correction of DKA.