Argininosuccinic aciduria (ASA) is a disorder of urea cycle metabolism most commonly characterized by either a severe, neonatal-onset form that manifests with hyperammonemia accompanied with vomiting, hypothermia, lethargy and poor feeding in the first few days of life, or late-onset forms (any age outside the newborn period) that manifest with stress or infection-induced episodic hyperammonemia or, in some, behavioral abnormalities and/or learning disabilities. Patients often manifest liver dysfunction. The disease is argininosuccinic aciduria (MONDO_0008815, a Monarch Disease Ontology id). Also known as: ASA deficiency, ASL deficiency, argininosuccinase deficiency, argininosuccinatelyase deficiency, argininosuccinic acid lyase deficiency, argininosuccinic acidemia, arginosuccinase deficiency, deficiency of argininosuccinate lyase.