---
title: HKMetadataKeyUDIProductionIdentifier
framework: healthkit
role: symbol
role_heading: Global Variable
path: healthkit/hkmetadatakeyudiproductionidentifier
---

# HKMetadataKeyUDIProductionIdentifier

The production identifier portion of a device’s UDI (unique device identifier).

## Declaration

```swift
let HKMetadataKeyUDIProductionIdentifier: String
```

## Discussion

Discussion Although the production identifier is part of a device’s UDI, it is not saved in the FDA’s GUDID (Globally Unique Device Identifier Database), and its use in HealthKit is now discouraged to protect user privacy. Apps that need this information should store it outside the HealthKit store.

## See Also

### Device Information Keys

- [HKMetadataKeyDeviceSerialNumber](healthkit/hkmetadatakeydeviceserialnumber.md)
- [HKMetadataKeyUDIDeviceIdentifier](healthkit/hkmetadatakeyudideviceidentifier.md)
- [HKMetadataKeyDigitalSignature](healthkit/hkmetadatakeydigitalsignature.md)
- [HKMetadataKeyDeviceName](healthkit/hkmetadatakeydevicename.md)
- [HKMetadataKeyDeviceManufacturerName](healthkit/hkmetadatakeydevicemanufacturername.md)
- [HKMetadataKeyDevicePlacementSide](healthkit/hkmetadatakeydeviceplacementside.md)
- [HKDevicePlacementSide](healthkit/hkdeviceplacementside.md)
- [HKMetadataKeyAppleDeviceCalibrated](healthkit/hkmetadatakeyappledevicecalibrated.md)