Is possible to have a person have a vital capacity within normal range but have a value for FEV1 below normal range?

Yes, it is possible for a person to have a vital capacity within the normal range while having a forced expiratory volume in one second (FEV1) below the normal range. This situation can occur in certain conditions, such as restrictive lung diseases, where lung volume is reduced but the ability to exhale forcefully is also compromised. In such cases, the overall lung capacity may still be normal, but the specific measure of FEV1 can indicate obstructive issues or other respiratory problems.