What does a blood ketone test check for?

Blood ketones are metabolic byproducts produced by the body when glucose is insufficient. Blood ketone testing typically involves checking blood glucose, ketone bodies, pH value, blood pyruvate, and β-hydroxybutyric acid. The details are as follows:

1. Blood Glucose

Elevated blood glucose levels may lead to ketonemia. In healthy individuals, normal blood glucose levels range between 3.9–6.1 mmol/L. Results exceeding the upper limit should raise concern.

2. Ketone Bodies

Ketone bodies serve as a diagnostic criterion for ketonemia. Increased levels of β-hydroxybutyric acid and acetoacetate in the blood, as revealed by testing, can easily lead to ketonemia.

3. pH Value

The pH value reflects the acidity or alkalinity of the blood. The clinically normal range is 7.35–7.45. A result below this range indicates excessive blood acidity, which may seriously threaten life if severe.

4. Blood Pyruvate

Blood ketones are intermediate products generated from the oxidative breakdown of fatty acids in the liver. During blood ketone testing, blood pyruvate levels should be monitored. Under fasting and resting conditions, the normal concentration of blood pyruvate ranges from 0.03–0.1 mmol/L. Values below or above this range may indicate underlying health issues.

5. β-Hydroxybutyric Acid

β-Hydroxybutyric acid can reflect subtle changes in blood ketone levels and is particularly useful in diagnosing diabetic ketoacidosis requiring emergency clinical intervention.

Patients are advised to seek evaluation at a reputable hospital to avoid misdiagnosis and delays in treatment. During this period, maintain a light diet and avoid spicy or irritating foods.