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Nadirah Damseh,1 Nada Quercia,1,2 Nisreen Rumman,3 Sharon D Dell,4 Raymond H Kim5 1Division of Clinical and Metabolic Genetics, 2Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada; 3Pediatric Department, Makassed Hospital, Jerusalem, Palestine; 4Division of Respiratory Medicine, Department of Pediatrics, Child Health Evaluative Sciences, Hospital for Sick Children, 5Fred A Litwin Family Centre in Genetic Medicine, University Health Network and Mount Sinai Hospital, Department of Medicine, University of Toronto, Toronto, ON, Canada Abstract: Primary ciliary dyskinesia is a genetically heterogeneous disorder of motile cilia that is predominantly inherited in an autosomal-recessive fashion. It is associated with abnormal ciliary structure and/or function leading to chronic upper and lower respiratory tract infections, male infertility, and situs inversus. The estimated prevalence of primary ciliary dyskinesia is approximately one in 10,000–40,000 live births. Diagnosis depends on clinical presentation, nasal nitric oxide, high-speed video-microscopy analysis, transmission electron microscopy, genetic testing, and immunofluorescence. Here, we review its clinical features, diagnostic methods, molecular basis, and available therapies. Keywords: genetic testing, Kartagener’s syndrome, primary ciliary dyskinesia