homocystinuria hyperhomocysteinemia https://github.com/monarch-initiative/mondo/issues/3247 https://rarediseases.info.nih.gov/diseases/8230/homocysteinemia https://www.malacards.org/card/hyperhomocysteinemia NCIT:C84770 MEDGEN:108623 GARD:0008230 MESH:D020138 A serious metabolic condition caused by mutations in the MTHFR gene, medications, or nutritional deficiency. It results in increased levels of homocysteine in the blood. Patients with this condition are at an increased risk for recurrent blood clots formation and cardiovascular accidents. MONDO:0004743 UMLS:C0598608 SCTID:419503008 OMIM:603174 DOID:9279 homocysteinemia hyperhomocysteinemia