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A major randomized trial comparing fresh versus frozen-thawed embryo transfer strategies in women at high risk of ovarian hyperstimulation syndrome showed that a freeze-all strategy substantially reduced the risk of moderate or severe OHSS. Subsequent studies have also demonstrated favorable pregnancy outcomes with frozen transfer in selected populations. The practical lesson is that delaying transfer can sometimes improve safety without sacrificing reproductive potential. For fertility specialists, the strategy is especially relevant for patients with high ovarian response, polycystic ovary syndrome or markedly elevated estradiol during stimulation. However, freeze-all is not automatically superior for every IVF patient, and cost, laboratory capability and patient preference matter. The approach also requires reliable vitrification and warming performance. The evidence supports individualized embryo-transfer timing as part of modern ovarian stimulation and ART planning.
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A major randomized trial comparing fresh versus frozen-thawed embryo transfer strategies in women at high risk of ovarian hyperstimulation syndrome showed that a freeze-all strategy substantially reduced the risk of moderate or severe OHSS. Subsequent studies have also demonstrated favorable pregnancy outcomes with frozen transfer in selected populations. The practical lesson is that delaying transfer can sometimes improve safety without sacrificing reproductive potential. For fertility specialists, the strategy is especially relevant for patients with high ovarian response, polycystic ovary syndrome or markedly elevated estradiol during stimulation. However, freeze-all is not automatically superior for every IVF patient, and cost, laboratory capability and patient preference matter. The approach also requires reliable vitrification and warming performance. The evidence supports individualized embryo-transfer timing as part of modern ovarian stimulation and ART planning.
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