Welch Allyn CP 200 Spirometry Option - User Manual - Manual (Page 39)

Directions for Use Chapter 4 Performing Spirometry Tests 35
About the Spirometry Parameters
During FVC and SVC testing, many parameters are measured and calculated. For
definitions of these parameters, see
“Glossary” on page 77.
During FVC testing, the two most important parameters in determining lung problems are
FVC and FEV1. (For a description of how the automatic interpretation software uses these
two measurements to determine the degree of obstruction or restriction, see
“Understanding Your Interpretation Results” on page 74.)
• FVC — forced vital capacity, the maximum volume of air that can be forcibly and
rapidly exhaled
• FEV1 — forced expiratory volume 1, the volume of air that is exhaled at one
second of a forced expiration
The following are important parameters for SVC testing:
• VT — tidal volume
• ERV — expiratory reserve volume
• IC — inspiratory capacity