<prompt> In COPD which is trueFEV1FVC 0.7FEV1FVC upward arrowRV downward arrowTLV downward arrow  <response>: COPD is characterised by reduced FEV1 with a reduction in FEV1FVC ratio less than 0.7.With worsening disease severity,lung volumes may increase,resulting in an increase in TLC,RV and FRC. Reference:Harrisons medicine-18th edition,page no:2156. 