A client with type 1 diabetes is admitted to the emergency department with suspected diabetic ketoacidosis (DKA). Which laboratory finding supports this diagnosis

Rationale: A. This combination is classic for DKA, which is a life-threatening complication of type 1 diabetes mellitus caused by absolute insulin deficiency. Pathophysiology includes: Hyperglycemia: Without insulin, glucose cannot enter cells, leading to elevated serum glucose (>250 mg/dL), Ketosis: Cells utilize fat for energy, producing ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone), detectable in urine and blood., Metabolic acidosis: Accumulation of ketone bodies lowers blood pH (<7.3) and bicarbonate (<18 mEq/L). The clinical manifestations, polyuria, polydipsia, dehydration, orthostatic hypotension, warm dry skin, and acetone breath, correlate with this lab pattern. This makes fluid replacement, insulin administration, and electrolyte management the top priorities. B. This indicates hypoglycemia with a normal to slightly alkalotic pH. DKA is characterized by hyperglycemia and metabolic acidosis, so low glucose rules out DKA. Hypoglycemia typically presents with tremors, diaphoresis, confusion, and possible seizures, which are different from DKA symptoms. C. This represents normoglycemia and normal pH, indicating no metabolic derangement. DKA requires both elevated glucose and acidosis, so this finding is inconsistent with the diagnosis. D. Although glucose is slightly elevated, the absence of ketones and likely normal pH means the client does not have DKA. Hyperglycemia alone does not constitute DKA; ketone production and acidosis are necessary components.