Inclusion Criteria:  Patients with a diagnosis of sarcoidosis according to ATS / ERS / WASOG criteria.  Exclusion Criteria:  Treatment (corticosteroids, plaquenil, immunosuppressants) within the last 6 months Patients with diabetes. Patient with long-term or recent drug treatment (e.g. antibiotics) Patients with a urinary tract infection or urinary lithiasis at the time of collection. Renal failure