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# HKMetadataKeyInsulinDeliveryReason

The medical reason for administering insulin.

```
let HKMetadataKeyInsulinDeliveryReason: String
```

## Discussion

This key is required for [`insulinDelivery`](/documentation/HealthKit/HKQuantityTypeIdentifier/insulinDelivery) samples. It takes an <doc://com.apple.documentation/documentation/Foundation/NSNumber> object containing a [`HKInsulinDeliveryReason`](/documentation/HealthKit/HKInsulinDeliveryReason) value.

## Topics

### Valid Delivery Reasons

Possible reasons for administering insulin.

[`HKInsulinDeliveryReason`](/documentation/HealthKit/HKInsulinDeliveryReason)

Possible reasons for administering insulin.


---

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