PSV (cm/s)	EDV (cm/s)	ICA:CCA, ratio(PSV)
Normal eller let stenose <50%	<130		<1.6
Moderat stenose 50-69%	130-229	<70	1.6-3.1
Svær stenose 70-99%	>230	>70	>3.1
Okklusion	Intet signal