Guideline No.	GRADE of recommendation	Level of evidence
3.1	2	C
We suggest that venous plethysmography be used selectively for the noninvasive evaluation of the venous system in patients with simple varicose veins (CEAP class C2).
Guideline No.	GRADE of recommendation	Level of evidence
3.2	1	B
We recommend that venous plethysmography be used for the noninvasive evaluation of the venous system in patients with advanced chronic venous disease if duplex scanning does not provide definitive information on pathophysiology (CEAP class C3-C6).