Flow volume curves measure flow, in litres per minute, with respect to time. The expiration is forced.
In some cases an inspiratory part is added; during this phase the time runs backwards and the line is plotted below the time axis. In this way a complete respiratory loop can be plotted.
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.