total lung capacity (TLC)

Pathology

Table

TLC (% predicted)	Assessment
> 120%	hyperinflation
80-120%	normal
65-89%	mild restriction
50-65%	moderate restriction
< 50%	severe restriction

• TLC may be normal or increased in obstructive lung disease

Physiology

• TLC = vital capacity + residual volume

Indications

• TLC is the primary measurement for assessing restrictive lung disease.

More general terms

• static lung volume