---
title: peripheralPerfusionIndex
framework: healthkit
role: symbol
role_heading: Type Property
path: healthkit/hkquantitytypeidentifier/peripheralperfusionindex
---

# peripheralPerfusionIndex

A quantity sample type that measures the user’s peripheral perfusion index.

## Declaration

```swift
static let peripheralPerfusionIndex: HKQuantityTypeIdentifier
```

## Discussion

Discussion The peripheral perfusion index measures the pulse strength at the monitoring site. These samples use percent 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)
- [forcedExpiratoryVolume1](healthkit/hkquantitytypeidentifier/forcedexpiratoryvolume1.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)