Background: Parkinson’s disease is a chronic progressive disease of the nervous system characterized by the cardinal features of rigidity, bradykinesia, tremor, and postural instability. In Parkinson’s disease every year there are less than 10 new cases per 100000 under the age of 50. while there are at least 300 new cases per 100000 ages 80 to 99 years annually. Pulmonary complications associated with Parkinson’s disease are a common reason for hospital admission 35.8% reported shortness of breath on exertion, 17.9% reported cough, and 13% reported sputum production. The pulmonary function test is mainly used to check the lung function capacity in Parkinson’s patients. In Parkinson’s patients due to forward head stoop posture there is a decrease in lung function capacity. In Parkinson’s disease morbidity and mortality are commonly caused by respiratory disorders from pulmonary function impairments.

Aims: The study's aim is to find out pulmonary function capacity in Parkinson’s disorder patients.
Objective: (1) To check FVC in Parkinson’s disorder patients.

(2) To check FEV1 in Parkinson’s disorder patients.

(3) To check FEV1/FVC ratio in Parkinson’s disorder patients.

Method: Pulmonary function test was conducted using PFT software and PFT probe (HELIOS-401) and results of FVC, FEV1, FEV1/FVC ratio were obtained from Parkinson’s disease patients.

Result: The data was assessed using PFT; the study showed that there has been a significant reduction in lung function capacity of  Parkinson’s disorder patients.

Conclusion: In the present study we concluded that the lung function capacity of Parkinson’s disorder patients was very low compared to that of normal individuals.