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A diagnosis of gangrene is based on a combination of physical examination, medical history and tests.

Your doctor will want to find out whether you have any long-term health conditions, or if you've recently experienced any injuries that could have caused the condition.

They'll also examine the affected area to check for any obvious signs of gangrene, such as a foul odour or discolouration of the skin.

A number of tests and investigations can be carried out to confirm the diagnosis of gangrene. These include:

As gangrene is a potentially serious condition, treatment is usually started before the results of any tests become available.