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# HKElectrocardiogram.Classification

Classifications returned by Apple Watch’s ECG algorithm.

```
enum Classification
```

## Topics

### Classifications

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

The sample exhibits no signs of atrial fibrillation.

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

The sample exhibits signs of atrial fibrillation.

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

An unclassifiable sample caused by a rapid heart rate.

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

An unclassifiable sample caused by a heart rate below 50 bpm.

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

An unclassifiable sample caused by an unclear signal.

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

An unclassifiable sample caused by an unknown issue.

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

A sample classification that this version of HealthKit doesn’t recognize.

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

A sample that doesn’t have an assigned classification.

### Initializers

[`init?(rawValue: Int)`](/documentation/HealthKit/HKElectrocardiogram/Classification-swift.enum/init(rawValue:))

## Relationships

### Conforms To

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Hashable`](/documentation/Swift/Hashable)

[`Sendable`](/documentation/Swift/Sendable)

[`Equatable`](/documentation/Swift/Equatable)

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

---

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