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# HKDataTypeIdentifierHeartbeatSeries

A series sample containing heartbeat data.

```
let HKDataTypeIdentifierHeartbeatSeries: String
```

## See Also

[`HKHeartbeatSeriesSample`](/documentation/HealthKit/HKHeartbeatSeriesSample)

A sample that represents a series of heartbeats.

[`HKHeartbeatSeriesQuery`](/documentation/HealthKit/HKHeartbeatSeriesQuery)

A query that returns the heartbeat data contained in a heartbeat series sample.

[`HKHeartbeatSeriesBuilder`](/documentation/HealthKit/HKHeartbeatSeriesBuilder)

A builder object for incrementally building a heartbeat series.


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