Ketone Level Interpreter
What your ketone reading actually means — nutritional ketosis, therapeutic targets, and the critical line between adaptation and emergency.
Your reading
Enter your ketone measurement and select how it was taken.
Blood BHB is the most accurate measure of current ketone levels.
Medications that affect ketone levels
SGLT2 inhibitors (empagliflozin, dapagliflozin, canagliflozin) can cause euglycemic ketoacidosis — elevated ketones with normal blood glucose. If you are on an SGLT2 inhibitor and your ketones are above 3.0 mmol/L, contact your provider even if your blood sugar is normal.
Insulin — insufficient insulin (missed doses, pump failure) is the primary driver of diabetic ketoacidosis. Unexpectedly elevated ketones in a person with type 1 diabetes are a medical signal, not a dietary indicator.
Corticosteroids (prednisone, dexamethasone) can raise blood glucose and may mask or complicate ketone interpretation in people with diabetes.
If you are taking any of these medications and your ketone reading is above 3.0 mmol/L, contact your healthcare provider regardless of symptoms.
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About this tool
Blood BHB Thresholds
Baseline (not in ketosis): below 0.5 mmol/L. Light ketosis: 0.5–1.0 mmol/L. Nutritional ketosis: 1.0–3.0 mmol/L. Deep/therapeutic ketosis: 3.0–5.0 mmol/L. Seek medical review: above 5.0 mmol/L.
Nutritional Ketosis vs DKA
Nutritional ketosis (0.5–3.0 mmol/L) is a normal metabolic state where insulin regulates and limits ketone production. Diabetic ketoacidosis (DKA) is a dangerous condition with uncontrolled ketone production (typically above 10 mmol/L), high blood glucose (above 250 mg/dL), and blood acidification (pH below 7.3). A person with functioning insulin regulation cannot develop DKA from diet alone. DKA occurs primarily in type 1 diabetes or in type 2 diabetes with SGLT2 inhibitor use.
Urine vs Blood Testing
Urine strips detect acetoacetate, a secondary ketone that is excreted as waste. After keto-adaptation (4–8 weeks), the body uses ketones more efficiently and excretes less, producing falsely low urine readings despite active ketosis. Blood BHB testing measures the primary circulating ketone and reflects real-time metabolic status regardless of adaptation stage.
Sources
Volek JS, Phinney SD. The Art and Science of Low Carbohydrate Living. Beyond Obesity, 2011. American Diabetes Association. Hyperglycemic Crises in Diabetes. Diabetes Care, 2009. JBDS Guidelines for the Management of DKA, 2023.
Educational tool only. Not for diagnostic purposes. Consult a healthcare provider for medical decisions.