846331 DCO diffusing capacity for carbon monoxide 21 846334 Dco diffusion of carbon monoxide 5 846330 DCO diffusing capacity for CO 4 846332 Dco diffusing capacity of the lungs for carbon monoxide 2 846426 Dco discs overgrown 2 846425 Dco costal diaphragm 1 846424 Dco diffusing capacity for carbon monoxide of the lungs 1