PerkinElmer Diagnostics 1 article published in JoVE Genetics A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene Huilin Wang*1, Xiaofan Zhu*2,3, Baoheng Gui*3,4, Wan Chee Cheung2, Mengmeng Shi2,3, Zhenjun Yang2,3, Ka Yin Kwok2, Ricky Lim5, Sanna Pietilä5, Yuanfang Zhu6,7, Kwong Wai Choy2,3 1Central Laboratory, Bao'an Maternity and Child Health Hospital, Jinan University, 2Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, 3Shenzhen Research Institute, The Chinese University of Hong Kong, 4Department of Genetics and Metabolism, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, 5PerkinElmer Diagnostics, 6Department of Obstetrics and Gynecology, Bao'an Maternity and Child Health Hospital, Jinan University, 7Maternal-Fetal Medicine Institute, Bao'an Maternity and Child Health Hospital, Jinan University An accurate and robust polymerase chain reaction-based assay for quantifying cytosine-guanine-guanine trinucleotide repeats in the Fragile X mental retardation-1 gene facilitates molecular diagnosis and screening of Fragile X syndrome and Fragile X-related disorders with shorter turn-around time and investment in equipment.