What is the FIT score?

The Fatigue Index Test (FIT) is a single breath measurement unique to any individual that gives a simple higher is a better number. This assesses the power generated by the inspiratory muscles and the amount of air moved into the lungs via the PrO2 device, fully representing respiratory capacity. It measures resistance to fatigue and the likelihood of incapacitating breathlessness, vital to well-being and life.