DKA stands for diabetic ketoacidosis, a serious complication of diabetes that occurs when the body produces dangerously high levels of blood acids called ketones. It develops when there isn’t enough insulin available to move blood sugar into cells for energy, forcing the body to break down fat as an alternative fuel source. That fat breakdown floods the bloodstream with ketones, making the blood more acidic than it should be. Without treatment, DKA can be life-threatening.
How DKA Develops in the Body
Insulin acts like a key that unlocks your cells so they can absorb glucose from your bloodstream. When insulin is absent or severely deficient, glucose builds up in the blood with nowhere to go. Your cells are essentially starving despite being surrounded by sugar.
Your liver responds to this energy crisis by breaking down stored fat for fuel. That process produces acids called ketones, which your body can use for energy in small amounts. But in DKA, ketones are produced too fast and in too great a quantity for the body to handle. They accumulate in the blood and shift its pH toward dangerously acidic levels, a state called metabolic acidosis. This acid buildup is what makes DKA a medical emergency rather than just a blood sugar problem.
Who Gets DKA
DKA is most closely associated with type 1 diabetes, where the body produces little or no insulin on its own. In hospital studies, roughly 83% of DKA cases involve people with type 1 diabetes. But it can also happen in type 2 diabetes, particularly during severe illness or infection. About 17% of DKA hospital admissions involve people with type 2 diabetes.
The single most common trigger is missed insulin doses. In one study, insulin non-adherence, meaning one or more skipped doses in the week before hospitalization, accounted for over half of all DKA cases. For people using insulin pumps, equipment malfunctions like kinked or air-filled tubing caused 55% of DKA episodes, since even a brief interruption in insulin delivery can spiral quickly. Underlying infections are the other major trigger, present in about 25% of cases among pump users.
Recognizing the Symptoms
DKA typically builds over hours to a day or two. Early signs overlap with general high blood sugar symptoms: excessive thirst, frequent urination, and fatigue. As ketone levels climb, more distinctive warning signs appear.
- Fruity-smelling breath: Ketones being expelled through the lungs produce a noticeable sweet or fruity odor.
- Nausea and vomiting: The acidic environment in the blood triggers gastrointestinal distress, which also makes it harder to keep food or fluids down.
- Deep, rapid breathing: The body tries to compensate for acidic blood by exhaling more carbon dioxide, leading to heavy, labored breaths.
- Confusion or difficulty concentrating: As the condition worsens, mental status changes can progress to loss of consciousness.
- Abdominal pain: Particularly common in children and often severe enough to be mistaken for a stomach condition.
How Doctors Diagnose It
Diagnosis requires three things happening at once: high blood sugar (200 mg/dL or above, or a known diabetes diagnosis), high ketone levels in the blood or urine, and acidic blood chemistry. Specifically, doctors look for a blood pH below 7.3 or a bicarbonate level below 18, both markers that the blood has become too acidic. These thresholds help distinguish DKA from ordinary high blood sugar, which is concerning but far less immediately dangerous.
There is one important exception. A form called euglycemic DKA can occur with blood sugar levels below 200 mg/dL. This variant is linked to a class of diabetes medications (SGLT-2 inhibitors) that lower blood sugar by causing the kidneys to excrete more glucose in urine. Because the blood sugar may look relatively normal, euglycemic DKA is easier to miss. The ketone buildup and acidosis are still present and still dangerous, but the usual red flag of very high blood sugar is absent.
What Happens During Treatment
DKA is treated in the hospital, often in an intensive care setting for severe cases. The core approach involves replacing fluids lost through excessive urination and vomiting, restoring insulin to stop ketone production, and correcting the electrolyte imbalances that develop as the body tries to manage the acid overload. Potassium levels in particular can swing dangerously during treatment and require close monitoring.
Most adults recover within 24 to 48 hours once treatment begins. The overall in-hospital mortality rate is around 4.5%, though outcomes are significantly better at hospitals experienced in managing the condition. For most people who receive timely care, DKA is reversible.
Risks for Children
DKA carries a specific danger for children that adults face less often: brain swelling. Clinically significant brain injury occurs in 0.3 to 0.9% of childhood DKA episodes, a small percentage that accounts for a disproportionate share of the harm. Between 50 and 80% of diabetes-related deaths in children are caused by this complication. Younger children and those newly diagnosed with diabetes face the highest risk, largely because their symptoms go unrecognized longer, leading to more severe DKA by the time they reach the hospital.
Imaging studies have found that some degree of brain swelling occurs in the majority of children with DKA, even when no obvious neurological symptoms are present. In one study, 56% of children showed ventricular narrowing (a sign of brain swelling) during treatment. This subclinical swelling typically resolves without lasting effects, but it underscores why pediatric DKA is treated with particular caution.
Preventing Repeat Episodes
Since missed insulin is the leading cause, the most effective prevention is consistent insulin use, even during illness when appetite drops and it might seem unnecessary. Sick days actually increase the need for careful insulin management because stress hormones released during illness raise blood sugar and accelerate ketone production.
Home ketone testing, using either urine strips or a blood ketone meter, can catch rising levels before they reach crisis point. Checking ketones when blood sugar stays above 250 mg/dL or during illness gives you an early warning window. If ketone levels are elevated and you can’t bring them down with your usual correction dose, that’s the signal to get medical help before full DKA sets in.
For insulin pump users, having backup injection supplies on hand is essential. A pump malfunction at night or during travel can push ketone levels into dangerous territory within just a few hours, faster than most people expect.