New Statement Issued for Pulmonary Testing in Preschool-Aged Children. Medscape 07/2007 (free subscription required)
It is now recognized that, given encouragement and suitable measurement conditions, most children between 2 and 6 years old can undertake PFT. This Medscape article summarizes the statement highlights.
Audio lecture: PFTs. Podcasting Project for the UT Internal Medicine Residency Program, 12/2007.
Assessing Lung Function - a Must in Asthma Therapy http://bit.ly/HBWj7I
Image source: Flow-volume loop, Wikipedia, GNU Free Documentation License.