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  "identifier" : "/documentation/HealthKit/HKQuery/predicateForElectrocardiograms(classification:)",
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  "title" : "predicateForElectrocardiograms(classification:)"
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# predicateForElectrocardiograms(classification:)

Returns a predicate that matches electrocardiogram samples with the specified classification.

```
class func predicateForElectrocardiograms(classification: HKElectrocardiogram.Classification) -> NSPredicate
```

## Parameters

`classification`

The target classification.

## Return Value

A predicate that matches electrocardiogram samples with the specified classification.

## Discussion

Use this convenience method to create a predicate that matches electrocardiogram samples with the specified classification. The following sample uses both the convenience method and a predicate format string to create equivalent predicates.

```swift
let forClassification = HKQuery.predicateForElectrocardiograms(classification: .atrialFibrillation)

let classification = HKElectrocardiogram.Classification.atrialFibrillation.rawValue

let explicitForClassification = NSPredicate(format: "%K == %d", HKPredicateKeyPathECGClassification, classification)
```

## See Also

[`let HKPredicateKeyPathECGClassification: String`](/documentation/HealthKit/HKPredicateKeyPathECGClassification)

The key path for the sample’s classification.


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