###Human: Does FEV1 71 % suggest COPD in a patient with productive cough? ###Assistant: Hello. Percentage predicted means how much is your observed value to the expected value. The computer predicts based on your height, age and gender and on equations how much your FEV1 (forced expiratory volume) and FVC (forced vital capacity) values should be if you are normal. Then in the test we calculate how much are your actual values. To say as normal in FEV1 and FVC we want your calculated value to be not less than 80 percent of your expected. That is 80 % predicted. Here your FEV1 is 71 % percentage predicted. As per values it suggests COPD (chronic obstructive pulmonary disease). But few observations, 1. This test is not very reliable as your graph picture shown on right hand side is not an acceptable one. So I personally would like to repeat it. 2. I do not see a bronchodilator reversibility test here, which is a must to see if it is asthma. 3. If you were a smoker and have symptoms I would suggest a repeat test with bronchodilator reversibility to get a definitive diagnosis.