An unusual case of hyperglycemia, abdominal pain, and increased anion gap acidosis.

In this case report we try to illustrate the importance of correct diagnostic reasoning and the misleading features of point-of-care testing. This case illustrates that even though hyperglycemia, ketonuria, a raised anion gap metabolic acidosis, and acute abdominal pain almost inevitably warrant a diagnosis of diabetic ketoacidosis, other possibilities still exist and need to be excluded. In that light, we emphasize the clinical and therapeutic importance of determining serum lactate and urinary ketones in the differential diagnosis of a raised anion gap metabolic acidosis.