Differentiating Alcoholic Ketoacidosis from Diabetic Ketoacidosis

Key Clinical and Laboratory Differences

The American Diabetes Association recommends differentiating Alcoholic Ketoacidosis (AKA) from Diabetic Ketoacidosis (DKA) based on plasma glucose levels, with AKA typically presenting with normal to mildly elevated glucose (rarely >250 mg/dL) or even hypoglycemia, while DKA characteristically presents with glucose >250 mg/dL 1, 2
DKA patients often have a history of known diabetes or new-onset diabetes with insulin deficiency, often precipitated by infection, medication non-compliance, or physiologic stress, according to the American Association of Clinical Endocrinologists 2
The American College of Physicians suggests that AKA can be distinguished from DKA by serum bicarbonate levels, with AKA often having profoundly low levels (often <18 mEq/L), causing severe acidosis 1
The American Diabetes Association notes that DKA is characterized by serum bicarbonate levels <18 mEq/L in mild DKA, and <10 mEq/L in severe DKA 2
Arterial pH values are significantly lower in AKA compared to DKA, with DKA having a pH <7.3 (mild: 7.25-7.30; moderate: 7.00-7.24; severe: <7.00), according to the American Thoracic Society 2

The American College of Emergency Physicians recommends that DKA management includes IV fluids, insulin therapy, and electrolyte replacement 2

Alcoholic ketoacidosis (AKA) develops due to a combination of insulin deficiency and increased counterregulatory hormones, leading to release of free fatty acids from adipose tissue and unrestrained hepatic fatty acid oxidation to ketone bodies, resulting in ketonemia and metabolic acidosis 3

Physical findings in AKA may include poor skin turgor indicating dehydration, tachycardia and hypotension, altered mental status, and Kussmaul respirations 3

Blood glucose levels in AKA typically range from hypoglycemic to mildly elevated, rarely exceeding a certain threshold 4, 5
Serum bicarbonate in AKA is usually lower than in starvation ketosis, often below a certain level 4

Diabetic ketoacidosis (DKA) typically has a higher blood glucose level than AKA, usually above a certain threshold 5
Starvation ketosis usually has a higher serum bicarbonate level than AKA, typically not lower than a certain level 4
Other causes of high anion gap metabolic acidosis include lactic acidosis and ingestion of certain drugs 6
Chronic renal failure typically presents with hyperchloremic acidosis, which is different from AKA 4