Viapath Analytics 1 article published in JoVE Biology Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants Joo Wook Ahn1, Michael Coldwell2, Susan Bint2, Caroline Mackie Ogilvie1 1Cytogenetics Department, Guy's & St Thomas' NHS Foundation Trust, 2Cytogenetics Department, Viapath Analytics Array CGH for the detection of genomic copy number variants has replaced G-banded karyotype analysis. This paper describes the technology and its application in a diagnostic service laboratory.