<prompt> In moderate severity obstructive lung disease, the expected abnormalities include the following except-upward arrow Residual capacitydownward arrow Vital capacitydownward arrowFRCTLC ratioFEV1 IFVC70  <response>: In moderately severe obstructive lung diseases,FEV1FVC ratio will be less than 0.7 and FEV1 will be 50-80 predicted.TLC will be increased,FRC is more severely elevated due to loss of lung elastic recoil dynamic hyperinflation.RV is very severely elevated due to airway closure.Vital capacity will be decreased.So FRCTLC will be increased in obstructive lung diseases. Reference:Harrisons Medicine-20TH edition 