Williams Syndrome FISH Analysis


Related Gene(s): CLIP2, ELN, GTF2I, GTF2IRD1, LIMK1

Williams syndrome (chromosome location 7q11.23) FISH (fluorescence in situ hybridization) is offered for diagnosis of individuals with clinical features of Williams syndrome, including intellectual disability, unique personality characteristics, cardiovascular disease, and connective tissue abnormalities. The detection rate of FISH analysis for this disorder is approximately 99%.

Specimen Requirements


  • Amniotic fluid: Minimum total specimen size 15 mL
  • Chorionic villi: Minimum total specimen size 4 mg



  • Whole blood: Minimum 5-10 mL in sodium heparin tube (green top)

Ordering Information


  • Ship at room temperature
  • Ship to:
    62 Southfield Ave, Stamford, CT 06902
    Phone: 800-298-6470 / Fax: 646-859-6870


Turnaround Time

  • Prenatal: 6-10 days
  • Postnatal: 6-10 days


Prenatal Test Requisition, including carrier screening and Noninvasive Prenatal Select
General Test Requisition
Chromosomal Microarray Information Sheet