<prompt> Following are true about COPD, exceptReduced FEV1Increased Residual VolumeDecreased Diffusion capacity DLcoDecreased Maximal Expiratory Flow Rate MEFR  <response>: COPD is an obstructive lung disease. Obstructive diseases have reduced FEV1, FVC and reduced FEV1FVC. Flow rates like MEFR Maximal Expiratory Flow Rate are also reduced. Due to air-trapping, the residual volume is increased. Reduction in DLco is seen interstitial lung diseases or pneumonias, not in COPD . DLco may be reduced in Emphysema due to alveolar damage. 