Health Buddy® System flags
| Green flag | Yellow flag | Red flag | |
| Shortness of breath | None | More than usual | Increased |
| Cough | None/usual | More than usual | See sputum or fever |
| Sputum | Usual/white | Yellow | Green/red/brown |
| Fever | ≤101.5°F | >101.5°F | |
| Activity difficulties | None | Some | Yes |
| Depression scale | Happy; no concerns | Staying at home; afraid something will happen | Feeling helpless or hopeless |
| FEV1 mL | >1000 | 800–1000 | <800 |
| 6MWD | Walked | No walk ≤1 day | No walk >1 day |
| Sp,O2 % | >89 | 88–89 | ≤87 |
Health Buddy® System is manufactured by HealthHero Network, Palo Alto, CA, USA; acquired in late 2007 by the Bosch Group. FEV1: forced expiratory volume in one second; 6MWD: 6-min walk distance; Sp,O2: oxygen saturation as measured by pulse oximetry.