---
title: HKMetadataKeyReferenceRangeLowerLimit
framework: healthkit
role: symbol
role_heading: Global Variable
path: healthkit/hkmetadatakeyreferencerangelowerlimit
---

# HKMetadataKeyReferenceRangeLowerLimit

A key that indicates the lower limit of the reference range for a lab result.

## Declaration

```swift
let HKMetadataKeyReferenceRangeLowerLimit: String
```

## Discussion

Discussion This key takes an NSNumber value.

## See Also

### Lab Keys

- [HKMetadataKeyWasTakenInLab](healthkit/hkmetadatakeywastakeninlab.md)
- [HKMetadataKeyReferenceRangeUpperLimit](healthkit/hkmetadatakeyreferencerangeupperlimit.md)