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PNS Index 
The PNS Index value is sent as part of the final results.
The application can receive the PNS Index result by implementing VitalSignsListener:
Dart
@override
void onFinalResults(VitalSignsResults results) {
    VitalSign? vitalSign = results.getResult(VitalSignTypes.pnsIndex);
    if (vitalSign != null && vitalSign is VitalSignPnsIndex) {
        VitalSignPnsIndex pnsIndex = vitalSign;
        print("PNS Index: ${pnsIndex.value}");
    }
}For general information about vital signs see the Vital Signs and Health Indicators Information Page.
For a list of supported vital signs per platform and measurement mode (face/finger) see the Supported Vital Signs Page.