Does Fresh Transfer vs Frozen Transfer Matter in Women Over 40?

When undergoing IVF, patients often have a choice between a fresh embryo transfer and a frozen embryo transfer. But does the difference matter, especially for women over 40? 

A fresh embryo transfer takes place during the same IVF cycle in which the eggs are retrieved and fertilized. With a frozen embryo transfer, the embryo is frozen and transferred during a later cycle. While embryo freezing is an effective part of modern fertility treatment, freezing and thawing introduces an additional step and a small chance that an embryo may not survive the process. 

Age plays an important role in IVF success. As women get older, they generally produce fewer eggs and egg quality also declines. As a result, there may be fewer embryos available from an IVF cycle. When embryo numbers are limited, every embryo matters and losing even one during the freezing and thawing process can be more significant. 

Egg quality also affects embryo quality. As women age, the likelihood of chromosomal abnormalities in embryos increases which can reduce the number of embryos capable of developing into a pregnancy. 

While some fertility clinics routinely use a "freeze-all" approach, research has not shown that delaying every embryo transfer provides a universal advantage. At the same time, there are situations where freezing embryos and transferring them later may be medically appropriate. 

The right approach depends on several factors including age, embryo quantity and quality, hormone levels, previous IVF history, and whether genetic testing is being done. 

Both fresh and frozen embryo transfers can result in successful pregnancies. However, freezing an embryo does not automatically make it more likely to result in a pregnancy. For women over 40, the decision may be particularly important because there are often fewer eggs and embryos available. Discussing the benefits and considerations of each approach with a fertility specialist can help determine which strategy is most appropriate for your individualized treatment. 

If you're interested in learning more, listen to our newest The Egg Factor episode with Dr. Norbert Gleicher here.