[Guideline 'Diagnostics of small-vessel vasculitis'].

The multidisciplinary guideline 'Diagnostics of small-vessel vasculitis' gives recommendations for the diagnostics of small-vessel vasculitis, which is often associated with cutaneous manifestations. The aim of this guideline is to accelerate the diagnostic process to prevent or reduce irreversible organ damage. The clinical presentation of small-vessel vasculitis is variable and often atypical. The most common general symptoms are general malaise, unexplained fever, weight loss, fatigue, loss of appetite, and night sweats. If these symptoms are accompanied by one or more organ-specific symptoms, the probability of the diagnosis 'small-vessel vasculitis' is increased. When small-vessel vasculitis is suspected a comprehensive history should be taken and a physical examination focused on internal organs, joints, skin and nervous system should be performed. With additional laboratory investigations possible organ involvement can be demonstrated and the small-vessel vasculitis can be further classified. To make a definite diagnosis histological examination of an affected organ is necessary. Because of the possible involvement of multiple organ systems, multidisciplinary collaboration is essential in the diagnostic work-up.

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