---
title: forcedExpiratoryVolume1
framework: healthkit
role: symbol
role_heading: Type Property
path: healthkit/hkquantitytypeidentifier/forcedexpiratoryvolume1
---

# forcedExpiratoryVolume1

A quantity sample type that measures the amount of air that can be forcibly exhaled from the lungs during the first second of a forced exhalation.

## Declaration

```swift
static let forcedExpiratoryVolume1: HKQuantityTypeIdentifier
```

## Discussion

Discussion These samples use volume units (described in HKUnit) and measure discrete values (described in HKQuantityAggregationStyle).

## See Also

### Lab and test results

- [bloodAlcoholContent](healthkit/hkquantitytypeidentifier/bloodalcoholcontent.md)
- [bloodGlucose](healthkit/hkquantitytypeidentifier/bloodglucose.md)
- [electrodermalActivity](healthkit/hkquantitytypeidentifier/electrodermalactivity.md)
- [forcedVitalCapacity](healthkit/hkquantitytypeidentifier/forcedvitalcapacity.md)
- [inhalerUsage](healthkit/hkquantitytypeidentifier/inhalerusage.md)
- [insulinDelivery](healthkit/hkquantitytypeidentifier/insulindelivery.md)
- [numberOfTimesFallen](healthkit/hkquantitytypeidentifier/numberoftimesfallen.md)
- [peakExpiratoryFlowRate](healthkit/hkquantitytypeidentifier/peakexpiratoryflowrate.md)
- [peripheralPerfusionIndex](healthkit/hkquantitytypeidentifier/peripheralperfusionindex.md)