Medtronic CGM

(Key:

• [x] available in data protocol/documented in spec and implemented
• [-] available in data protocol/documented in spec but not yet implemented
• [?] unknown whether available in data protocol/documented in spec; not yet implemented
• *[ ] TODO: needs implementation!
• [ ] unavailable in data protocol and/or not documented in spec and not yet implemented)

Required if Present

CBG

• [x] cbg values
• [?] units of cbg values (read from device, not hard-coded)
• [x] out-of-range values (LO or HI)
• [ ] out-of-range value thresholds (e.g., often 40 for low and 400 for high on CGMs)

Device-specific? (Add any device-specific notes/additions here.)

• Medtronic also provides the raw (interstitial) signal, which we store in the payload

Device Events

• [x] calibrations
  • [x] calibration value
  • [?] units of calibration value (read from device, not hard-coded)
• [ ] time changes (presence of which is also in the BtUTC section below)
  • [ ] device display time from (before change) and to (result of change)
  • [ ] agent of change (automatic or manual)
  • [ ] timezone
  • [ ] reason for change (read from device)

Device-specific? (Add any device-specific notes/additions here.)

Time change events for the CGM have cgm in the payload, while pump time changes have pump in the payload.

Settings

• *[?] units preference for BG display
• *[?] units of data being uploaded (will be mutated to mmol/L storage units if not mmol/L)
• *[?] transmitter ID
• *[?] low alert settings
  • *[?] enabled
  • *[?] level/threshold
  • *[?] snooze threshold
• *[?] high alert settings
  • *[?] enabled
  • *[?] level/threshold
  • *[?] snooze threshold
• *[?] rate-of-change alerts
  • *[?] fall rate alert
    • *[?] enabled
    • *[?] rate threshold for alerting
  • *[?] rise rate alert
    • *[?] enabled
    • *[?] rate threshold for alerting
• *[?] out-of-range alerts
  • *[?] enabled
  • *[?] snooze time between alerts
• *[?] predictive alerts
  • *[?] low prediction
    • *[?] enabled
    • *[?] time sensitivity (minutes to predicted low for alerting)
  • *[?] high prediction
    • *[?] enabled
    • *[?] time sensitivity (minutes to predicted high for alerting)
• *[?] calibration alerts/reminders
  • *[?] pre-reminder
  • *[?] overdue alert

Settings history:

• [?] device stores all changes to settings OR
• [?] device only returns current settings at time of upload

No Tidepool data model (yet): volume and/or vibrate mode of all alerts (can/should go in payload).

Device-specific? (Add any device-specific notes/additions here.)

"Bootstrapping" to UTC

• [x] index
  • [ ] UTC timestamp (Hey, one can dream!) OR
  • [ ] internal timestamp or persistent log index (across device communication sessions) to order all pump events (regardless of type), independent of device display time OR
  • [x] ephemeral log index (does not persist across device communication sessions) to order all pump events (regardless of type), independent of device display time
• [x] date & time settings changes

Device-specific? (Add any device-specific notes/additions here.)

The CGM sensor has its own ephemeral log index and time change events, so is bootstrapped separately from the pump.

No Tidepool Data Model Yet

NB: You can and should add to this section if there are other data types documented in the device's data protocol specification but not part of Tidepool's data model (yet).

• [-] alarms, e.g. low glucose
• [ ] activity/exercise
• [ ] food (e.g., Dexcom allows logging carb events)
• [ ] notes/other events