Normal Ketone Levels
May 10, 2022
Source: Cainiu Health
Dr. Pan Yongyuan
Introduction
Ketones are categorized into urinary ketones and blood ketones. Urinary ketones are typically negative, which falls within the normal range. Blood ketone levels below 0.3 mmol/L are considered normal; levels between 0.3–0.6 mmol/L indicate a suspiciously positive result for ketones, while levels above 0.6 mmol/L signify ketosis. When elevated ketone levels are detected, the patient’s blood glucose level should also be assessed.
Due to impaired glucose metabolism, excessive mobilization of fat metabolism occurs, and the liver’s capacity to clear ketone bodies is limited—ultimately leading to ketosis, ketonemia, and ketonuria. So, what are the normal reference values for ketone bodies?
Normal Ketone Body Values
Ketone bodies are measured in either urine (urine ketones) or blood (blood ketones). Urine ketones are normally negative. Blood ketone levels below 0.3 mmol/L are considered within the normal range; levels between 0.3–0.6 mmol/L indicate a borderline (suspected) positive result; and levels above 0.6 mmol/L signify ketosis.
If elevated ketone levels are detected, there is no need for excessive concern. At this point, the patient’s blood glucose level should also be assessed. If blood glucose is normal but blood ketones are elevated, this is likely attributable to fasting-induced ketosis; retesting after eating typically shows resolution of ketonemia. However, if both blood glucose and blood ketones are elevated, diabetic ketosis—and potentially diabetic ketoacidosis (DKA)—must be considered, and prompt medical evaluation and treatment are essential.
Patients with underlying illness, chronic malnutrition, or prolonged fasting are prone to increased fat metabolism, resulting in excessive accumulation of ketone bodies in the bloodstream and impaired excretion—leading to elevated blood ketone levels. In such cases, dietary adjustment alone is often sufficient. Conversely, if diabetic ketoacidosis is present, urgent glucose-lowering therapy is required. We hope this information proves helpful!
