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Stress Index 
The Stress Index value is sent as part of the final results.
The application can receive the Stress Index result by implementing VitalSignsListener:
Dart
@override
void onFinalResults(VitalSignsResults results) {
    VitalSign? vitalSign = results.getResult(VitalSignTypes.stressIndex);
    if (vitalSign != null && vitalSign is VitalSignStressIndex) {
        VitalSignStressIndex stressIndex = vitalSign;
        print("Stress Index: ${stressIndex.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.