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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: Steroid Sulfatase Deficiency GTD Test type Cytogenetic GTD Location Children's Hospital of Eastern Ontario GTD Gene/Platform/Region List STS, Xp11.31 GTD Category Chromosomal Anomalies GTD Disease/Condition Steroid Sulfatase Deficiency (X-Linked Ichthyosis, Steroid Sulfatase Deficiency (SSD), Steroid sulfatase deficiency disease (SSDD), Placental steroid sulfatase deficiency)