I agree, but the contra or ipsilateral CFV waveform would possibly show a partial or full obstuction during breathing meanuvers or quiet respiration, would it not? Also, why would CFV or Iliac obstuction, coincide with scanning the contralteral FV, PopV and other lower limb vessels.
The point here is, other than curiousity why scan the other whole leg? Is it a waste of time or is it really peritent to the intervention? Keep in mind there are plenty of labs that do not scan below the knee anymore.
Please understand I am not attacking or leading away from proper healthcare in anyway, but it seems redundant to scan the whole other extremity if the intervention is the same.