irregularHeartRhythmEvent: HealthKit category type
HKCategoryTypeIdentifierIrregularHeartRhythmEvent · read from Apple’s documentation on 2026-10-02
HKCategoryTypeIdentifier.irregularHeartRhythmEvent (Objective-C HKCategoryTypeIdentifierIrregularHeartRhythmEvent) is a HealthKit category type in Apple's "Vital Signs" group. Apple's abstract: “A category sample type for irregular heart rhythm events.” Apple's page names the generic HKCategoryValue for its sample values rather than an enum of its own. Apple states that apps cannot save it: “The irregular rhythm samples are read-only.” It is available from iOS 12.2 and watchOS 5.2.
What Apple says irregularHeartRhythmEvent is
A category sample type for irregular heart rhythm events.
Apple’s abstract, quoted from its irregularHeartRhythmEvent reference page, read 2026-10-02. Apple’s discussion of the type runs 85 words.
- Swift
HKCategoryTypeIdentifier.irregularHeartRhythmEvent- Objective-C
HKCategoryTypeIdentifierIrregularHeartRhythmEvent- Family
HKCategoryTypeIdentifier- Apple's topic group
- Vital Signs
- Group page
- Vital signs
- Apple's reference
- irregularHeartRhythmEvent on developer.apple.com
Availability
The versions Apple’s documentation data gives for irregularHeartRhythmEvent, platform by platform, as read on 2026-10-02.
| Platform | Introduced | Deprecated |
|---|---|---|
| iOS | 12.2 | — |
| iPadOS | 12.2 | — |
| Mac Catalyst | 13.0 | — |
| macOS | 13.0 | — |
| visionOS | 1.0 | — |
| watchOS | 5.2 | — |
The rest of that release: HealthKit Types Introduced in iOS 12.
What a sample holds
Value enum
HKCategoryValue — the enum Apple’s page for irregularHeartRhythmEvent names: the generic one, not one of its own. Every category type’s enum is on the HKCategoryValue reference.
Aggregation style and unit family apply only to quantity types. For a category type the dataset records neither, because the concept does not apply — not because Apple declined to say.
Can apps write irregularHeartRhythmEvent?
No. Apple’s documentation states that these samples are read-only:
The irregular rhythm samples are read-only.
On Android Health Connect
No verified Health Connect counterpart. The cross-platform matrix pairs only metrics checked against both Apple’s and Google’s documentation, and irregularHeartRhythmEvent is not among them. A similarly named Health Connect record may exist, but a name match is not a verified mapping.
Questions
- Which enum decodes irregularHeartRhythmEvent sample values?
- The generic HKCategoryValue. Apple's page for irregularHeartRhythmEvent names it rather than an enum of its own; this site's HKCategoryValue reference lists every category type that resolves the same way and what that means for reading the samples.
- Can my app write irregularHeartRhythmEvent samples to HealthKit?
- No. Apple's documentation for irregularHeartRhythmEvent states: "The irregular rhythm samples are read-only." (read 2026-10-02).
- Which iOS version added irregularHeartRhythmEvent?
- iOS 12.2. Apple's availability data for irregularHeartRhythmEvent lists iOS 12.2, iPadOS 12.2, Mac Catalyst 13.0, macOS 13.0, visionOS 1.0 and watchOS 5.2.
Sources checked
- Apple — HKCategoryTypeIdentifier.irregularHeartRhythmEvent · read 2026-10-02
- Apple — HKCategoryTypeIdentifier · read 2026-10-02
Apple’s abstract and sentences are quoted for identification; the page layout, the capsule and the cross-platform pairing are AIFitnessAPI’s. Generated from Apple’s documentation by scripts/fetch-healthkit-identifiers.mjs, not typed by hand — the same data as the full identifier table.