---
title: HKCorrelationTypeIdentifier
framework: healthkit
role: symbol
role_heading: Structure
path: healthkit/hkcorrelationtypeidentifier
---

# HKCorrelationTypeIdentifier

The identifiers that create correlation type objects.

## Declaration

```swift
struct HKCorrelationTypeIdentifier
```

## Overview

Overview To create an HKCorrelationType instance, pass an HKCorrelationTypeIdentifier value to the correlationType(forIdentifier:) method.

## Topics

### Correlation Types

- [bloodPressure](healthkit/hkcorrelationtypeidentifier/bloodpressure.md)
- [food](healthkit/hkcorrelationtypeidentifier/food.md)

### Initializers

- [init(rawValue:)](healthkit/hkcorrelationtypeidentifier/init(rawvalue:).md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Creating correlation types

- [correlationType(forIdentifier:)](healthkit/hkobjecttype/correlationtype(foridentifier:).md)