# predicates An array of sample predicates that define the type of data that the query returns. ``` var predicates: [HKSamplePredicate] { get set } ``` ## Discussion To query for multiple types of data, provide a sample predicate for each type. If your [`HKSamplePredicate`](/documentation/HealthKit/HKSamplePredicate) instances return different [`HKSample`](/documentation/HealthKit/HKSample) subclasses, use [`sample(type:predicate:)`](/documentation/HealthKit/HKSamplePredicate/sample(type:predicate:)) to create the sample predicates. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)