Reply to Alberto Ferlin's Letter to the Editor, re: Taylor P. Kohn, Jaden R. Kohn, Ryan C. Owen, R. Matthew Coward. The Prevalence of Y-chromosome Microdeletions in Oligozoospermic Men: A Systematic Review, Meta-analysis of European, North American Studies. Eur Urol 2019, 76:626-36. Indication for Y Chromosome Microdeletion Analysis in Infertile Men Should Not be, Based Merely on Sperm Concentration: Shared Decision-Making and Reconsideration of Thresholds for Genetic Testing of Men with Severe Spermatogenic Failure.