Inflammation of the pleura (lining of lungs) causing chest pain with breathing
Pulmonary function test results are the core evidence for most rating levels. Records showing FEV-1, FEV-1/FVC ratio, and DLCO (SB) values — expressed as percentages of predicted — directly correspond to the 10%, 30%, 60%, and 100% thresholds. For the 60% level, a cardiopulmonary exercise test reporting maximum oxygen consumption with a cardiorespiratory limitation can also satisfy the criteria. For a 100% rating, records documenting cor pulmonale, right ventricular hypertrophy, or pulmonary hypertension shown by echocardiogram or cardiac catheterization are relevant, as are hospital records of acute respiratory failure or a prescription and treatment records for outpatient oxygen therapy. If you have pleurisy with empyema, records confirming that diagnosis and its resolution date matter for the automatic 100% rating under the regulation's note. Your own statements and statements from people who know you can help show how breathing difficulties affect your work and daily activities, supporting the overall picture of severity.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.