vital capacity and forced vital capacity

2010premed said:

Is there a difference between vital capacity and forced vital capacity?

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I may be completely wrong, but here is what I found:

forced vital capacity (FVC) vital capacity measured when the patient is exhaling with maximal speed and effort.

vital capacity VC; the volume of gas that can be expelled from the lungs from a position of full inspiration, with no limit to duration of inspiration; equal to inspiratory capacity plus expiratory reserve volume.