{"code":"C222234","name":"Double Marker Test","terminology":"ncit","version":"26.09d","conceptStatus":"DEFAULT","leaf":true,"active":true,"synonyms":[{"name":"Double test","termType":"SY","type":"FULL_SYN","typeCode":"P90","source":"caDSR"},{"name":"Double Marker Test","termType":"PT","type":"FULL_SYN","typeCode":"P90","source":"NCI"},{"name":"Double Screen","termType":"SY","type":"FULL_SYN","typeCode":"P90","source":"NCI"},{"name":"Double Marker Test","type":"Preferred_Name","typeCode":"P108"}],"definitions":[{"definition":"A blood test done near the end of the first trimester of pregnancy to screen for common chromosomal defects. This test screens for blood levels of both free beta-human chorionic gonadotrophin (beta-hCG) and pregnancy-associated plasma protein A (PAPP-A) and can detect trisomies of chromosomes 21 (Down's syndrome), chromosome 18 (Edward's syndrome), and chromosome 13 (Patau's syndrome).","code":"P97","type":"DEFINITION","source":"NCI"}],"properties":[{"code":"P106","type":"Semantic_Type","value":"Laboratory Procedure"},{"code":"P207","type":"UMLS_CUI","value":"C0554818"}]}