Monarch Disease Ontology id MONDO_0010602 (hemophilia A) is the most common form of hemophilia characterized by spontaneous or prolonged hemorrhages due to factor VIII deficiency. Also known as: Subhemophilia, congenital factor VIII disorder, factor VIII deficiency, haemophilia a, X-linked recessive, haemophilia type A, haemophilia type a, hemophilia a, X-linked recessive, hemophilia type A.