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# HKMetadataKeyHeartRateSensorLocation

The location where a specific heart rate reading was taken.

```
let HKMetadataKeyHeartRateSensorLocation: String
```

## Discussion

This key takes an <doc://com.apple.documentation/documentation/Foundation/NSNumber> containing an [`HKHeartRateSensorLocation`](/documentation/HealthKit/HKHeartRateSensorLocation) as its value.

## Topics

### Valid Locations

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

Constants that indicate where on the body the heart rate sensor is located.


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