Final answer:
The patient achieved 66.67% of the predicted forced vital capacity. The FEV1/FVC ratio is 69.23%, which is on the borderline but slightly indicates restrictive lung disease.
Step-by-step explanation:
The patient’s measured vital capacity is 2.6L compared to a predicted forced vital capacity of 3.9L. To determine the percent of predicted vital capacity achieved, we use the following formula: (Measured VC / Predicted VC) × 100. So, (2.6L / 3.9L) × 100 = 66.67%.
Therefore, the patient has achieved 66.67% of the predicted vital capacity.
The FEV1/FVC ratio is calculated by dividing FEV1, the amount of air expelled in the first second, by the total forced vital capacity. Here, the patient exhaled 1.8L in the first second.
Thus, the FEV1/FVC ratio is (1.8L / 2.6L) = 0.6923, or 69.23%. This ratio helps diagnose the type of lung disease: a high ratio indicates restrictive lung disease, whereas a low ratio suggests obstructive lung disease.
Given this patient's ratio, it's on the borderline but slightly indicative of restrictive lung disease.