The<unk> , also called Tiffeneau-Pinelli index, is a calculated<unk>  used in the diagnosis of obstructive and restrictive lung disease. It represents the proportion of a person's vital capacity that they are able to expire in the first second of forced expiration <unk>  to the full, forced vital capacity <unk> . The result of this<unk>  is expressed as<unk> %. Normal values are approximately 75%. Predicted normal values can be calculated online and depend on age, sex, height, and ethnicity as well as the research study that they are based upon. A derived value of<unk> % is<unk> % predicted, which is defined as<unk> % of the patient divided by the average<unk> % in the population for any person of similar age, sex, and body composition.
FEV1/FVC ratio
Peak expiratory flow
Lung allocation score
Vital capacity
Functional residual capacity
Lung volumes
Lung compliance
Peak inspiratory pressure