Medical apparatus for monitoring, tracking, and determining analyte concentrations; sensors for monitoring, tracking, and determining analyte concentrations for health purposes. None of the foregoing in the field of personal emergency response systems (PERS) or mobile personal emergency response systems (MPERS) except in connection with management of diabetes. Medical apparatus and instruments for diabetes management use; medical apparatus and instruments for monitoring glucose; medical apparatus and instruments for monitoring ketones; instruments and apparatus for monitoring glucose for health purposes; instruments and apparatus for monitoring ketones for health purposes; patient monitoring sensors for monitoring glucose concentrations; patient monitoring sensors for monitoring ketone concentrations; sensor-based glucose monitors for medical purposes; sensor-based ketone monitors for medical purposes; analyte monitoring systems for monitoring glucose; analyte monitoring systems for monitoring ketones