If you are suffering from kidney disease, your situation might get to the point where you and your doctor decide that it is time to seek a kidney transplant operation. At that time, finding a kidney transplant donor will take on utmost importance. 
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You probably already know that finding a donor is not as simple as many people think. Beyond that, a good friend or someone is willing to offer one of their kidneys for you will be the next best thing. Collectively, all these people are considered to be a living donor.
There are also cases where people have died from an accident. They may have previously agreed to donate their organs after their death. Act of kindness and charity is of the highest order as a donor kidney transplant will now be able to keep other people alive.
Before any operation can be started, there are some tests that need to be done. There are many components of the blood and usually, the individual components are not exactly from donor to recipient. One key to a successful operation is to have a perfect match between the many components as possible.
The more matches, the better the chances for a successful operation. Finally, the cross-match test involves mixing the donor blood with the blood of the recipient.
A negative result means that compatible blood while a positive result means that the recipient's blood contains antibodies that will fight cells from the donor … not good.
After a kidney transplant operation has been successfully made, the patient should be supervised by a physician very carefully.