IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-12-7-51068 Original Research Paper Study Of Efficacy Of Forced Expiratory Time As A Supportive Diagnostic Test In Cases Of Chronic Obstructive Pulmonary Disease Jayapriya.S Dr. Dr. Balaji Kalimuthu Dr. July 2023 12 7 01 02