The Glucose Ketone Index (GKI) chart is included as a default in the Chart library for Gold Users.
Glucose Ketone Index (GKI) is a ratio of Blood Glucose (mmol) divided by Blood Ketones (mmol). The ratio of blood glucose to blood ketones is a clinical biomarker for metabolic management. (1)
If you have used the mg/dL unit option when logging your biometrics, the units will be normalized to mmol for the GKI calculation (Right Axis) You may still choose to plot mg/dL for your Glucose and Ketone data points (Left Y Axis).
GKI will be calculated for biometric pairs (Blood Glucose and Blood Ketones). Entries are paired in the order they appear in the diary, or if they have timestamps then the closest timed entry (within 10 minutes).
(1) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4367849/pdf/12986_2015_Article_9.pdf