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The Validic Inform API suports Dexcom CGM data as intraday cgm, or high-frequency data. But you already knew that.
What you may not know is that the implementation of the Dexcom intraday cgm data includes some things that are worth calling out to ensure that you are properly capturing all possible data for your patients.
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Validic captures a maximum of 30 days of Dexcom historical data. This would be the 30 days prior to the Dexcom user first syncing to Validic. While Dexcom may be able to have more than 30 days of historical data, Validic chose to only pull in 30 days due to the sheer volume of intraday cgm data that would have to be captured, stored, and then made available in the Inform API.
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As noted on this page,https://helpdocs.validic.com/docs/high-frequency-data , Validic is getting the CGM data from Dexcom in 5 minute intervals via hourly data pulls. Each new hourly pull of data from Dexcom looks at the timestamp of the last record received and then adds 5 seconds to that time to look for new data. retrieves all data for the last 3 UTC days.
Because of the 1 hour delay that Dexcom has on the CGM data, this means that each payload would CGM records will include the readings from up to the previous hour. For example, at 10 am UTC the 10am payload would include the records readings from 8am to 9ammidnight UTC up to 9 am UTC.
Duplicate Data
If a patient fully disconnects Dexcom from their Validic user and then reconnects that same user within 30 days, it is highly likely that the data pulled in upon reconnection will contact include duplicate data that you have already received. Normally you would You can use the Validic "id" and "checksum" to check for data you may have already consumed. This will not work for the Dexcom CGM data. You would want to check the "time" and "value" pairs of the CGM records to check for possible duplicates.
Timezones
Validic does not get timezone information from Dexcom. Therefore, the user is asked to provide their home timezone when connecting to Dexcom via the Validic Marketplace. If they had previously provided this timezone information, they will not be prompted for it again. The offset_origin for Dexcom will be "user_defined".
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If you have non-US users, please note that a non-US timezone must be set in the Validic user profile. See the “Regional Servers“ section above for more details. |
As a result, if a user is traveling across timezones, their Dexcom data will still show their timezone (utc_offset) as their base or home timezone. If this same user has other devices in use, like Fitbit or Apple Health, that do provide updated timezone information from the user's phone, you may see different utc_offsets depending on the data source.For more specifics on time handling for Dexcom cgm, please see the article: https://help.validic.com/space/VCS/4272259073/Dexcom+Time+Representations
Scenarios that Dexcom data wouldn’t be available in their cloud
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