Restrictive ventilatory defect Restrictive deficit on pulmonary function testing The most commonly used term for this feature is restrictive lung disease, but we choose the term Restrictive ventilatory defect to emphasize that this term refers to a phenotypic feature rather than a disease entity. HP:0002091 HP:0002111 UMLS:C0085581 Restrictive lung disease A functional defect characterized by reduced total lung capacity (TLC) not associated with abnormalities of expiratory airflow or airway resistance. Spirometrically, a restrictive defect is defined as FEV1 (forced expiratory volume in 1 second) and FVC (forced vital capacity) less than 80 per cent. Restrictive lung disease may be caused by alterations in lung parenchyma or because of a disease of the pleura, chest wall, or neuromuscular apparatus. Spirometric restriction Stiff lung or chest wall causing decreased lung volume SNOMEDCT_US:36485005 UMLS:C3277226 Restrictive respiratory syndrome Restrictive respiratory insufficiency Restrictive respiratory disease Restrictive deficit on pulmonary function tests Abnormality on pulmonary function testing