Which ART cycle involves cryopreserving all oocytes or embryos with no transfer in that cycle?

Which ART cycle involves cryopreserving all oocytes or embryos with no transfer in that cycle?

• A. Fresh embryo transfer
• B. Frozen-thawed embryo transfer
• C. Frozen-thawed oocyte cycle
• D. Freeze-all cycle

Answer: (D)

The main idea here is a cycle dedicated entirely to freezing all viable oocytes or embryos, with no fresh transfer in that same cycle. This approach is known as a freeze-all cycle. By freezing everything, clinics can avoid transferring in the current cycle and instead plan a transfer in a later cycle when the uterus is optimally prepared, or to reduce risks like ovarian hyperstimulation syndrome. In contrast, a fresh embryo transfer happens in the same cycle, so there is a transfer during that cycle. A frozen-thawed embryo transfer involves transferring embryos that were previously frozen, but the cycle in which the freezing occurred was separate and there was no transfer then. A frozen-thawed oocyte cycle focuses on freezing eggs and later using them, with no immediate transfer in that retrieval cycle. Because the defining feature here is that no transfer occurs in the cycle in which all material is frozen, the correct term is freeze-all cycle.

The main idea here is a cycle dedicated entirely to freezing all viable oocytes or embryos, with no fresh transfer in that same cycle. This approach is known as a freeze-all cycle. By freezing everything, clinics can avoid transferring in the current cycle and instead plan a transfer in a later cycle when the uterus is optimally prepared, or to reduce risks like ovarian hyperstimulation syndrome.

In contrast, a fresh embryo transfer happens in the same cycle, so there is a transfer during that cycle. A frozen-thawed embryo transfer involves transferring embryos that were previously frozen, but the cycle in which the freezing occurred was separate and there was no transfer then. A frozen-thawed oocyte cycle focuses on freezing eggs and later using them, with no immediate transfer in that retrieval cycle. Because the defining feature here is that no transfer occurs in the cycle in which all material is frozen, the correct term is freeze-all cycle.