There aren’t many organs that could be taken from a living donor: kidney being one, and a partial liver transplant being the other.
To remove a kidney from a donor requires actual surgery into the abdominal cavity or the retroperitoneal cavity. There are a lot of potentially very important structures a surgeon will have to avoid and identify in order to get sufficient space to get the kidney out with all the attached vessels and structures.
On the other hand putting a kidney in does not require entering the belly: a transplanted kidney is placed near the groin. There are certainly important things that have to be identified but not to the same degree of danger as organ removal.
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