Beta-thalassemia - X-linked thrombocytopenia is a form of beta-thalassemia characterized by splenomegaly and petechiae, moderate thrombocytopenia, prolonged bleeding time due to platelet dysfunction, reticulocytosis and mild beta-thalassemia. The disease is beta-thalassemia-X-linked thrombocytopenia syndrome (MONDO_0010745, a Monarch Disease Ontology term). Also known as: X-linked thrombocytopenia with Beta-thalassemia, XLTT, thrombocytopenia with beta-thalassemia, X-linked, X-linked recessive.