Basal deliveryType: temp

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NB: All fields are required unless otherwise noted.

Jump to example JSON:

type

[ingestion, storage, client] The string basal.

QUICK SUMMARY
Required:
    jellyfish: yes
    platform: yes

deliveryType

[ingestion, storage, client] The string temp.

QUICK SUMMARY
Required:
    jellyfish: yes
    platform: yes

This is the sub-type of basal event that represents temporary intervals of basal insulin delivery requested by the user. Insulin pumps allow the request of a temporary basal insulin rate for a period of time up to twenty-four hours as a percentage of the current active rate or as a rate specified by the user. Some insulin pumps allow the user to set temporary basal rates both by percentage and by manual specification at the user's choice; other insulin pumps only expose one of these interfaces.

Field co-occurrence requirements: Note that when ingesting through the legacy jellyfish ingestion API, at least one of percent or rate must be provided on a temp basal. While each of these fields is marked as optional, one or the other must be present.

In contrast, under the new platform APIs, rate is always required.

duration

[ingestion, storage, client] An integer value representing a duration of time in milliseconds.

QUICK SUMMARY
Required:
    jellyfish: yes
    platform: yes
Numerical type: Integer value representing milliseconds.
Range:
    min: 0
    max: 86400000

Unlike on scheduled basals, both the legacy jellyfish ingestion API and the new platform APIs require a duration on every temp basal since an insulin pump user is always required to program a duration for a temporary basal rate interval along with the desired temporary rate (or percentage of active rate) itself.

The new platform APIs expect this value to be >= 0 and <= 86400000 (the number of milliseconds in twenty-four hours), as no pump manufacturer that we know of currently allows the programming of a temporary basal rate for longer than twenty-four hours.

expectedDuration

This field is optional. At present, it is only added by the jellyfish data ingestion service.

[storage, client] An integer value representing an original programmed duration of time in milliseconds, copied from the duration field on ingestion when a following event has resulted in truncation of the original programmed duration.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: no (optional)
Numerical type: Integer value representing milliseconds.
Range:
    min: >= `duration`
    max: 86400000

Changelog for expectedDuration

_schemaVersion ? (future): expectedDuration is implemented as described in this documentation. If the _schemaVersion listed here is "? (future)," all data up to and including the current _schemaVersion has not implemented expectedDuration as described.

On a basal ingested through the legacy jellyfish ingestion service, expectedDuration should never be included on a temp basal event, but it may be added by jellyfish under circumstances where a new basal event results in truncation of the duration of the original temp basal; most commonly this new event is a scheduled (user chose to cancel the temporary rate) or a suspend. See the examples in previous.

In Tidepool's new platform APIs (under active development as of April, 2016 at the time of the initial drafting of this document), the burden will be on the client to provide the expectedDuration where available and relevant, but it will never be a required field. Many insulin pumps provide information on the original programmed duration of a temp basal in the raw data and/or provide the programmed "time left" when a temp basal is canceled. Where this is true, the uploading client is expected to provide the expectedDuration in addition to the actual duration (if these two values differ) for a temp basal event.

percent

This field is optional.

[ingestion, storage, client] A floating point number >= 0 representing a percentage multiplier of the current basal rate to obtain the temp rate in units per hour.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: no (optional)
Numerical type: Floating point value representing a percentage, where 1.0 represents 100%.
Range:
    min: 0.0
    max: 10.0

Different insulin pump manufacturers expose different interfaces for setting temporary basal rates by percentage—some express the change in terms of a positive or negative percentage from the current active rate, and some express the change in terms of an absolute percentage of the current active rate. For example, if the current active scheduled basal rate is 0.5 units per hour, a pump that represents the change as positive or negative from the current rate would implement a rate of 0.25 when the user programs a -50% temp basal and a rate of 0.75 when the user programs a +50% temp basal. On the other hand, a pump that represent the change as an absolute percentage of the current rate would require the user to input 50% to yield the 0.25 units per hour temporary rate and 150% to yield the 0.75 temporary rate.

For the Tidepool data model, we have standardized on a floating point representation of the second strategy. For us, the value 0.0 represents a temp basal at 0% of the current active rate, 0.5 at 50% of the current active rate (0.25 units per hour, in the example), 1.0 at a trivial 100% of current active rate (0.5 units per hour), 1.5 at 150% of the current active rate (0.75 units per hour), and so on. The upper limit of 10.0 (representing 1000% percent of the current active rate) was chosen arbitrarily as a common-sense upper bound; at least some pumps set their upper bound for temp basal rate increases much lower than this, for example at < 200% of the current active rate.

previous

This field is optional when ingesting data through the jellyfish service but will no longer exist when ingesting data through the new platform APIs.

[ingestion] An object representing the basal event just prior to this event or, equivalently, just the id of said object.

[storage, client] This field does not appear, as it is only used in processing during ingestion and not stored.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: nonexistent

See previous for detailed documentation on this deprecated field.

rate

This field is optional when ingesting data through the jellyfish service but required when ingesting data through the new platform APIs.

[ingestion, storage, client] A floating point number >= 0 representing the amount of insulin delivered in units per hour.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: yes
Numerical type: Floating point value rounded to the appropriate significant figures for the device's precision.
Range:
    min: 0.0
    max: 20.0

See rate on the scheduled basals documentation for discussion of significant digits and rounding on basal rate values.

Also note that when ingesting data through the legacy jellyfish ingestion API, providing a rate is optional as long as a percent and suppressed with its own rate are also provided. In the new platform APIs, we are shifting the burden of calculating the rate of a percentage-programmed temp basal to the uploading client. (Most, if not all, insulin pump manufacturers provide the rate directly in their raw data models anyway.)

suppressed

This field is optional.

[ingestion, storage, client] An object representing another basal event - namely, the event that is currently suppressed (inactive) because this temp basal is in effect.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: no (optional)

May contain—only!—the following properties:

  • type
  • deliveryType
  • rate
  • scheduleName

suppressed.type

[ingestion, storage, client] The string basal.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: yes

suppressed.deliveryType

[ingestion, storage, client] The string scheduled.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: yes

suppressed.rate

[ingestion, storage, client] A floating point number >= 0 representing the amount of insulin delivered in units per hour.

QUICK SUMMARY
Required:
    jellyfish: yes
    platform: yes
Numerical type: Floating point value rounded to the appropriate significant figures for the device's precision.
Range:
    min: 0.0
    max: 20.0

suppressed.scheduleName

This field is optional.

[ingestion, storage, client] A string: the name of the basal schedule.

QUICK SUMMARY
Required:
    jellyfish: no (optional)
    platform: no (optional)

Depending on the data protocol, it is not always possible to keep track of what basal rate would have been in effect had a temp basal not been programmed by the user, but where this information is available, it should be provided in as much detail as possible as an embedded basal object as the value for the suppressed key on a temp basal.

This object need only contain the bare minimum of information:

  • a type of basal
  • a deliveryType, usually scheduled
  • the scheduleName if relevant and available (see scheduleName for more details)
  • the suppressed rate if relevant and available

In particular, note that no time-related fields such as time, deviceTime, or duration are expected to appear on a suppressed embedded basal rate event. By definition, any values for time-related fields are identical to the parent temp basal object, and so it is redundant to include them.

Properly tracking the suppressed basal information for a temp basal that crosses one or more basal schedule boundaries is a complex topic that requires a longer explanation.

clockDriftOffset

See common fields.

conversionOffset

See common fields.

deviceId

See common fields.

deviceTime

See common fields.

time

See common fields.

timezoneOffset

See common fields.

uploadId

See common fields.

_active

See common fields.

_groupId

See common fields.

_schemaVersion

See common fields.

_version

See common fields.

createdTime

See common fields.

guid

See common fields.

id

See common fields.

example (client)

{
    "type": "basal",
    "deliveryType": "temp",
    "duration": 28800000,
    "expectedDuration": 34560000,
    "percent": 0.75,
    "rate": 0.1875,
    "suppressed": {
        "type": "basal",
        "deliveryType": "scheduled",
        "scheduleName": "Weekend",
        "rate": 0.25
    },
    "clockDriftOffset": 0,
    "conversionOffset": 0,
    "deviceId": "DevId0987654321",
    "deviceTime": "2018-05-14T18:00:00",
    "guid": "a58d9efb-3f0d-41d3-a711-edf890a3062e",
    "id": "e52976685fc94f7a9d0272fdd5c63fa0",
    "time": "2018-05-14T08:00:00.000Z",
    "timezoneOffset": 600,
    "uploadId": "SampleUploadId"
}

example (ingestion)

{
    "type": "basal",
    "deliveryType": "temp",
    "duration": 50400000,
    "expectedDuration": 60480000,
    "percent": 0.65,
    "rate": 1.2025,
    "suppressed": {
        "type": "basal",
        "deliveryType": "scheduled",
        "scheduleName": "Stress",
        "rate": 1.85
    },
    "clockDriftOffset": 0,
    "conversionOffset": 0,
    "deviceId": "DevId0987654321",
    "deviceTime": "2018-05-14T18:00:00",
    "time": "2018-05-14T08:00:00.000Z",
    "timezoneOffset": 600,
    "uploadId": "SampleUploadId"
}

example (storage)

{
    "type": "basal",
    "deliveryType": "temp",
    "duration": 82800000,
    "expectedDuration": 99360000,
    "percent": 0.75,
    "rate": 0.075,
    "suppressed": {
        "type": "basal",
        "deliveryType": "scheduled",
        "scheduleName": "Very Active",
        "rate": 0.1
    },
    "_active": true,
    "_groupId": "abcdef",
    "_schemaVersion": 0,
    "_version": 0,
    "clockDriftOffset": 0,
    "conversionOffset": 0,
    "createdTime": "2018-05-14T08:00:05.000Z",
    "deviceId": "DevId0987654321",
    "deviceTime": "2018-05-14T18:00:00",
    "guid": "7a504ee3-17a5-4ec8-b157-c1a985731192",
    "id": "e3b4654d90664fca9a30c20ff19c93fd",
    "time": "2018-05-14T08:00:00.000Z",
    "timezoneOffset": 600,
    "uploadId": "SampleUploadId"
}

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