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# PFT Report Interpretation The provided text describes interpretation of Pulmonary Function Tests (PFT). * **FEV1/FVC Ratio:** * A good initial indicator. * A reduced ratio (less than 70%) suggests obstructive lung disease. * **TLC (Total Lung Capacity):** * If TLC is less than the l...

# PFT Report Interpretation The provided text describes interpretation of Pulmonary Function Tests (PFT). * **FEV1/FVC Ratio:** * A good initial indicator. * A reduced ratio (less than 70%) suggests obstructive lung disease. * **TLC (Total Lung Capacity):** * If TLC is less than the lower limit of normal (LLN) of predicted normal, and FEV1/FVC is normal, then restrictive lung disease is likely. * **DLCO (Diffusing Capacity of the Lung for Carbon Monoxide):** * If DLCO is below the LLN, a diffusion defect is present. Possible causes might include emphysema or pulmonary fibrosis. * **Possible Causes of Diffusion Defects:** * **Reduced surface area:** Emphysema * **Thickened AC membrane:** Pulmonary fibrosis