Do you always comment on VA and KCO when reading PFT's when gas transfer is ordered?  

I do not. I look at the VA to see if it meets ATS criteria ( [1] >=90% of largest VC in the session; or >=85% and within 200cc or 5% of the largest VC; [2] breath hold of 10 +/- 2 sec; [3] >=85% of inh ventilation inhaled in <4sec)