<Tr> <Td_colspan="2"> Flow - Volume loop showing successful FVC maneuver . Positive values represent expiration, negative values represent inspiration . At the start of the test both flow and volume are equal to zero (representing the volume in the spirometer rather than the lung). The trace moves clockwise for expiration followed by inspiration . After the starting point the curve rapidly mounts to a peak (the peak expiratory flow). (Note the FEV value is arbitrary in this graph and just shown for illustrative purposes; these values must be calculated as part of the procedure). </Td> </Tr> <Tr> <Th> MeSH </Th> <Td> D013147 </Td> </Tr> <Tr> <Th> OPS - 301 code </Th> <Td> 1 - 712 </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr>

The forced vital capacity maneuver is performed as a means to