Recommendations	Grade	Level of evidence	Key references
6.15	Obtain high-quality angiographic imaging with dedicated views of ankle and foot arteries to permit anatomic staging and procedural planning in all CLTI patients who are candidates for revascularization.	Good practice statement
6.16	Use an integrated limb-based staging system (eg, GLASS) to define the anatomic pattern of disease and preferred TAP in all CLTI patients who are candidates for revascularization.	Good practice statement
6.17	Perform ultrasound vein mapping when available in all CLTI patients who are candidates for surgical bypass.	1 (Strong)	C (Low)	Seeger,77 1987 Wengerter,78 1990 Schanzer,79 2007
6.18	Map the ipsilateral GSV and small saphenous vein for planning of surgical bypass. Map veins in the contralateral leg and both arms if ipsilateral vein is insufficient or inadequate.	Good practice statement
6.19	Do not classify a CLTI patient as being unsuitable for revascularization without review of adequate-quality imaging studies and clinical evaluation by a qualified vascular specialist.	Good practice statement