AKT-0279
A 70-year-old woman presented with an ulcer over the left ankle, which had developed over the previous nine months. She had a history of right deep vein thrombosis (DVT) five years previously.
On examination she had a superficial slough-based ulcer, 6 cm in diameter, over the medial malleolus with no evidence of cellulitis.
What investigation is required prior to the application of compression bandaging?