Patients can begin developing ketoacidosis at blood sugars above 250 mg/dL. Physicians usually move on to ketone testing when blood sugars exceed this level.
Patients with DKA may present with an anion gap metabolic acidosis, showing decreased bicarbonate and increased hydrogen ions.
Patients typically are very acidic, due to ketone buildup, and display blood pH levels below 7.3.
As patients are experiencing a metabolic acidosis, the bicarbonate levels (HCO3) are below 18.
DKA patients display plasma ketones, and in a 1:1 dilution display 4+ in a nitroprusside reaction. These ketone levels are what distinguishes DKA from nonketotic hyperglycemia.
Due to a transcellular shift, patients display hyperkalemia. Normally, insulin helps drive potassium into cells. Because there is a lack of insulin in DKA, intracellular potassium is shifted into the extracellular space, causing hyperkalemia.
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