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GTD Indications Diagnosis Carrier / Cascade Testing Prenatal GTD Samples Accepted Blood Amniocyte CVS GTD Test Methodology FISH GTD Methodology Notes Metaphase FISH GTD Notes Before requesting this test, please contact the lab for information regarding eligibility and availability of testing for your patient. Generic Test name (cms title) FISH: Saethre-Chotzen Syndrome GTD Test type Cytogenetic GTD Location Children's Hospital of Eastern Ontario GTD Gene/Platform/Region List TWIST1, 7p21.2 GTD Category Chromosomal Anomalies GTD Disease/Condition Saethre-Chotzen (Saethre-Chotzen Syndrome, Acrocephalosyndactyly Type III (ACS3), Chotzen syndrome, Blepharophimosis,epicanthus inversus, and ptosis 3)