Hereditary Spherocytosis and Vascular Function

Inclusion Criteria: Healthy controls: * age ≥ 6 years old * written, informed and signed consent by the healthy volunteer, or by both parents or legal guardian if the healthy volunteer is a minor * Healthy volunteer affiliated to a social security scheme or assimilated * Healthy volunteer not subject to any legal protection measure Patients with hereditary spherocytosis: * age ≥ 6 years old * Patient with hereditary or non-splenectomized spherocytosis * Written, informed and signed consent by the patient, or by at least one of the two parents or legal guardian if the patient is a minor * Patient affiliated to a social security scheme or assimilated * Patient not subject to any legal protection measure Exclusion Criteria: Healthy controls: * Pregnant or lactating woman * Subjects with hereditary spherocytosis or other characterized condition by chronic hemolysis * Subjects with known pathology affecting the vascular system * Blood donation (less than a month old) * Not affiliated to a social security scheme * Patient participating in another interventional research protocol that may interfere with this protocol (according to the investigator's judgment). Patients with hereditary spherocytosis: * Patient who received a blood transfusion in the 3 months preceding * Pregnant or lactating woman * Any disease or condition other than hereditary spherocytosis, chronic or not, likely to induce chronic or acute intravascular hemolysis * Patient participating in another interventional research protocol that may interfere with this protocol (according to the investigator's judgment).