Medical apparatus and instruments for diabetes management use; medical apparatus and instruments for monitoring interstitial fluid glucose; medical apparatus and instruments for monitoring ketones; patient monitoring sensors for diabetes management; diabetes management monitoring devices; sensor-based glucose monitors for medical purposes; sensor-based ketone monitors for medical purposes; continuous glucose monitoring systems; biosensors for tracking analytes; medical diagnostic apparatus for determination of analyte concentrations; medical apparatus for monitoring analyte concentrations in interstitial fluid; patient monitoring sensors for monitoring analyte concentrations; sensors for monitoring analyte concentrations for health purposes; patient monitoring sensors for determination of analyte concentrations in interstitial fluid; sensors for determination of analyte concentrations in interstitial fluid for health purposes; medical apparatus and instruments for use in monitoring and managing health, wellness, and nutrition; health monitoring devices for use in monitoring and managing health, wellness, and nutrition; patient monitoring devices for use in monitoring and managing health, wellness, and nutrition; patient monitoring sensors for measuring analyte levels; health monitoring sensors for measuring analyte levels.