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Table 2 Degree of stenosis based on luminal area

From: DEep VEin Lesion OPtimisation (DEVELOP) trial: protocol for a randomised, assessor-blinded feasibility trial of iliac vein intervention for venous leg ulcers

Vein < 20% stenosis 20 to 49% stenosis 50 to 69% stenosis > 70% stenosis
Common iliac vein ≥ 161mm2 160 to 103 mm2 102 to 62 mm2 ≤ 61 mm2
External iliac vein ≥123mm2 122 to 79 mm2 78 to 48 mm2 ≤ 47 mm2
Common femoral vein ≥ 90 mm2 89 to 58 mm2 57 to 35 mm2 ≤ 34 mm2