Magnetic-activated cell sorting (MACS) MACS is a method for selecting live and functional sperm that aren’t apoptotic (dying). Synonyms: Magnetic-activated cell sorting, MACSRelated Articles: Evidence-based recommendations from ESHRE for 27 IVF add-onsHighlights from ESHRE’s 39th Annual Meeting (2023)Monthly IVF research roundup (July 2025)Italian fertility group issues 2025 guidance on 28 IVF add-onsHighlights from ASRM’s 81st annual meeting (2025)