A woman successfully gave birth to a child from an embryo that had been frozen 22 years ago. People are wondering: does such a long storage period really have no effect on the future child's health, and what is actually known about long-term storage of biological material?
Embryo cryopreservation is considered a safe method from a scientific standpoint, and the case of pregnancy after 22 years is a bright example of this, though not the only one. Long-term storage in liquid nitrogen at around −196 °C essentially "freezes" all biological processes: cells don't age, divide, or degrade under such conditions. So in theory, an embryo can be stored for decades without any change to its properties.
However, there are some nuances. The freezing and thawing procedures themselves are where the risks can occur. Ice crystal formation inside cells can damage their structure, which is why cryoprotectants (special substances) are used to minimize damage. The success of the procedure depends on equipment quality, specialist experience, and freezing technology - modern methods are much better than they were 20+ years ago. Statistics show that children born from long-stored embryos develop just as healthily as those from "fresh" ones, but long-term studies are still ongoing simply because this is a relatively new practice on a generational scale.
The main thing is to entrust the process to a reputable clinic with good experience. The length of storage time itself doesn't increase risks if conditions are perfect, but the quality of all the procedures involved matters much more 😊
The question is phrased as if 22 years is some kind of extreme case, but in reality cryopreservation works equally well after 5 years and after 20. The key is the conditions: at the right temperature (minus 196 degrees in liquid nitrogen) biological processes are basically frozen, cells don't age and don't degrade. This story actually proves the reliability of the technology rather than its riskiness.
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