Relationship Between Biological Phenotype, Clinical Severity of Sickle Cell Disease, and Blood Coagulation

Inclusion Criteria: * Aged 8 years or older * Under clinical follow-up for a diagnosis of sickle cell disease, specifically genotypes S/S, S/beta0, or S/C * Patient covered by a social security or equivalent health insurance plan * Collection of the non-opposition for adults * Information of the minor and collection of the non-opposition from both parents Exclusion Criteria: * Patient who has undergone a transfusion or therapeutic phlebotomy within the 3 months prior to inclusion * Patient participating in another interventional research protocol that may interfere with the present protocol (at the investigator\'s discretion) * Patient under guardianship, curatorship, or legal protection * Patient subject to a legal protection measure * Person admitted to a health or social care institution for purposes other than research