What do vital capacity (VC), FVC or SVC mean?

The reduced respiratory capacity can be determined using the vital capacity (VC) respiratory test. In addition to determining the cough and body weight, measuring vital capacity is a key parameter that is regularly determined in ALS outpatient clinics and used as a basis for deciding on possible treatment measures. The measurement of vital capacity can be carried out in different ways: by breathing in and out quickly (FVC, forced vital capacity) or by breathing in and out slowly (SVC slow vital capacity).