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Inclusion Criteria

• Adult patients (age over 18 years),
• Patients with vasculitis, as defined in the Chapel Hill International Nomenclature as revised in 2012,
• Patients included at an active phase of the disease, either the initial flare or a relapse,
• Patients who have been informed and have signed the consent
• Pregnant and breastfeeding women may be included in the study,
• Affiliated to a social security system (beneficiary or entitled person).
• Affiliated to a social security system

Exclusion Criteria:

• Refusal of consent or inability to obtain consent,
• A patient who is insane or not entitled, for psychiatric reasons or intellectual impairment, to receive information about the protocol and to give informed consent,
• Patient under guardianship / curators
• Patient on state medical assistance (AME)
• Hemoglobin less than 7 g/dl at the time of sampling,
• Hemoglobin level less than 9 g/dl at the time of sampling if the patient has respiratory or cardiovascular disease,
• Patient weighs less than 18 kg.
• Parallel participation in an interventional protocol is permitted.