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Updated: Jul 29, 2026

Cryopreservation of Preimplantation Embryos of Cattle, Sheep, and Goats
Published on: August 5, 2011
Meeting the challenge of unclaimed cryopreserved embryos
Kathryn J Go1, Phillip A Romanski2, Pietro Bortoletto3
1Center for Infertility and Reproductive Science, The Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
Abstract:
With the rise of efficient and highly effective embryo cryopreservation techniques, the modern in vitro fertilization laboratory has unintentionally become a long-term storage facility for embryos and gametes. One challenge posed by long-term storage is the issue of unclaimed, effectively abandoned, cryopreserved embryos whose owners cannot be identified or are unable to provide a dispositional decision. Given the nuanced nature of dealing with human tissue, no straightforward solutions for managing this novel scenario have prevailed. In this article, we discuss the problem faced by physicians, clinics, and patients alike when faced with unclaimed cryopreserved embryos. We also review strategies for proactive prevention and resolution of conflicts that may arise when making dispositional decisions.

