helium dilution method

he·li·um di·lu·tion meth·od

(hē'lē-ŭm di-lū'shŭn meth'ŏd)
A procedure for indirect determination of residual lung volume and functional residual capacity.
Synonym(s): closed circuit helium dilation.
References in periodicals archive ?
However, the helium dilution method is known to underestimate lung volumes, while body plethysmography measures increased lung volumes in obstructive patients [6].