An array CGH is indicated by a gynaecologist in one of the following cases: Abnormal ultrasound findings, e.g. organ malformation in combination with growth retardation or multiple malformations. Abnormal chromosomal findings that need to be further clarified. History of chromosomal abnormalities in the family. Family history of increased risk of developing abnormalities. Repeated miscarriages. We also perform array CGH if the prospective parents have a great need for reassurance and want very detailed information about the chromosomal picture of the foetus.