Answer :
Final answer:
Your forced expiratory volume (FEV1.0) would be 3000 ml if you can force out that volume in one second from a vital capacity of 4000 ml. The FEV1.0 is pivotal in diagnosing and differentiating between restrictive and obstructive lung diseases.
Explanation:
If you have a vital capacity of 4000 ml and can force out 3000 ml in 1 second, your FEV1.0, which stands for forced expiratory volume in one second, would be 3000 ml. FEV1.0 is an essential pulmonary function test that measures lung function and it helps in diagnosing lung diseases.
During spirometry, FEV1.0 measures how much air you can expel from your lungs in that one second time period. The FEV1/FVC ratio is particularly useful in distinguishing between restrictive and obstructive lung diseases. A high FEV1/FVC ratio indicates non-compliant lungs, often seen in lung fibrosis, whereas a low ratio can indicate obstructions typical in conditions such as asthma.
In your case, with a vital capacity of 4000 ml and an FEV1.0 of 3000 ml, the ratio would be 0.75 or 75% when expressed as a percentage. This is within the normal range as an FEV1/FVC ratio below 70% typically suggests an obstructive lung disease.
