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can be done by two ways,
1. cadaveric transplantation
2. from a relative with matched HLA
/HLA matched human being
In simple words, can be donated from a person whose blood and genetic factors match with the person who need it
The kidney is removed and implanted in the patients iliac region(lower abdomen) and the native kidney will be left behind.
But before going for this , a few tests will be done to make sure kidneys can sustain further as in blood tests, renal function tests, etc .
Wish you good health