June 22, 2026 · Human reproduction (Oxford, England) · DOI: 10.1093/humrep/deag098

A large retrospective study on 1PN embryo transfer supports the need for updated harmonized best practice guidelines

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The authors aimed to investigate whether the genetic and clinical outcomes of monopronuclear blastocysts (MPBs) differ between standard insemination and intracytoplasmic sperm injection (ICSI) cycles, and how these differences might affect risk stratification and clinical decision-making. They found that IVF-derived MPBs had significantly lower rates of uniparental inheritance compared to ICSI-derived MPBs, with comparable clinical outcomes to 2PN blastocysts when euploid biparental embryos were transferred. These results suggest a need for updated guidelines on the management of MPBs, particularly emphasizing a risk-stratified approach based on the fertilization method used.

Nicole O McPherson, Clare Ussher, Sandra Holden, Natalie Hesketh, Andrew Murray, Alice Lee, Diana Bui, Maria V Traversa, Steve Grkovic, Rebecca Dickson, Mark Bowman, Anthony Marren, Dean E Morbeck

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