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# HKPredicateKeyPathECGClassification

The key path for the sample’s classification.

```
let HKPredicateKeyPathECGClassification: String
```

## Discussion

Use this constant whenever you want to include the ECG’s classification in a predicate format string. Add a `%K` placeholder to the format string, and then pass this constant as an argument.

## See Also

[`enum Classification`](/documentation/HealthKit/HKElectrocardiogram/Classification-swift.enum)

Classifications returned by Apple Watch’s ECG algorithm.


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