Researchers Develop Simple Finger Prick Test to Monitor Metabolic Health - Video

Could a simple finger-prick blood test help monitor the risk of chronic diseases? Researchers believe it might, but they say more clinical studies are needed before it can be used routinely.

Published in Frontiers in Science, scientists propose using the Glucose Ketone Index (GKI)-a ratio of blood glucose to ketones measured from a finger-prick sample—to track metabolic health in people with non-communicable diseases (NCDs). These conditions, including cancer, heart disease, type 2 diabetes, obesity, and neurodegenerative disorders, account for about three in four deaths worldwide and are expected to increase further by 2050.

The researchers suggest that GKI could help monitor how well lifestyle interventions such as healthy diets, fasting, and exercise shift the body into nutritional ketosis, a metabolic state with lower glucose and higher ketone levels that may support healthier energy production in cells.

Unlike measuring blood sugar or body weight alone, GKI combines glucose with beta-hydroxybutyrate, the main ketone produced during ketosis. According to the authors, lower GKI values indicate lower blood sugar and higher ketone availability, which may reflect more efficient mitochondrial function—the process by which cells generate energy. Mitochondrial dysfunction has been linked to many chronic diseases.

Researchers say GKI could provide doctors with a practical way to monitor metabolic changes during treatment and assess whether interventions are reducing inflammation, high blood sugar, and insulin levels. However, they emphasize that ketogenic approaches are management strategies, not cures, and should only be followed under medical supervision.

The authors also stress that disease-specific GKI target ranges have not yet been established. They are calling for larger clinical trials to validate the test, standardize reporting of glucose and ketone levels, and determine how well GKI predicts health outcomes across different diseases.

If future studies confirm its value, GKI could become a simple tool for monitoring metabolic health and supporting lifestyle-based management of chronic diseases.

REFERENCE: Lee, D. C., et al. (2026) The glucose ketone index: a proposed quantitative biomarker to support cancer and chronic disease prevention and management. Frontiers in Science. DOI: 10.3389/fsci.2026.1763395.