What are Kidney Transplant Tests?

What are Kidney Transplant Tests?

Each organ of the body has to do its unique duties so that the body functions normally. When kidneys are not functioning normally, a harmful level of the waste materials, minerals, and fluids accumulate inside the body, which is very dangerous and causes many problems. To prevent consequences, the person should undergo either dialysis sessions or a kidney transplant surgery.

A kidney transplant is a surgical procedure that replaces a dysfunctional kidney with a healthy donated one. The main function of a kidney is to filter and remove waste materials, fluids, or minerals from the blood by producing urine. End-stage renal disease occurs when kidneys lose their ability to filter blood by 90 percent.

There are two major types of renal transplants: deceased donor and living donor kidney transplants. Before having a renal transplant, you should take many steps in order to get ready for the surgery. You need to be evaluated physically and psychologically and if you were qualified, you have to undergo special blood tests to detect your blood and tissue type in order to find a match.


Why Kidney Transplant is done?

 End-stage renal disease (ESRD) occurs when the kidneys have lost around 90% of their ability. Mal-functioning kidneys can increase the dangerous level of waste materials in the body leading to high blood pressure and kidney failure. People who suffer from end-stage renal disease need to remove the waste fluids out of their bodies via either a dialysis machine or a kidney transplant.

Considering the needed time and the cost of treatments, a kidney transplant seems to be a better option for the majority of the patients. Although choosing the suitable type of treatment will be determined by the specialist doctor depending on the patient’s age and general health. If your physical health cannot tolerate the surgery, you may be recommended to undergo dialysis treatment.

Types of Kidney Transplant


When it comes to renal transplant surgery, two sources can be used for getting donor kidneys. You can receive a kidney from a person who has recently passed away or from somebody who is still alive. Donor kidneys can come from an alive person because we can survive with only one healthy kidney. If you want to get a donated kidney from a deceased person, your name needs to be registered on the national waiting list.

Waiting Time for a Deceased Donor Kidney

On average, you need to wait for 3 to 5 years before a renal transplant from a deceased donor. In different cases, this time could be lessened or extended. The waiting time depends on where you live, the availability of a matching kidney in your area, the time you have been under dialysis, your age, and many other factors. When a deceased donor kidney becomes available, the transplant center will contact you to attend the hospital for blood tests. The renal transplant could be canceled if there were problems with the donated organ or your test results. If so, you need to try not to get discouraged because you might get another one anytime soon.

Waiting Time for a Deceased Donor Kidney

Waiting Time for a Living Kidney Donor

When you have a living donor who is compatible, you can have your renal transplant as soon as possible. Both donor and recipient need to be ready for this operation, though. You have to keep your mind open for any uncontrolled conditions such as a health problem that keep you or your donor from undergoing the transplantation. If you do not have a living donor, you may need to wait on the list for some years. It is a good idea to have your name registered on the waiting list for a deceased kidney while you are looking for a living donor at the same time. That way, you can receive the first donor kidney that is available.

Required Tests before Kidney Transplant

Required Tests before Kidney Transplant


Before a kidney transplant, you need certain tests to see if you are qualified to receive a kidney. In addition, you should do the tests in order to find a donor matching you the most.




The transplant team should have a full health evaluation on you to decide if you are ready to have a transplant. You will need to undergo several tests and exams, to make sure you are physically ready for this operation. You also require having a mental evaluation by social workers to ensure you are not only physically ready but also mentally eligible to receive a donor kidney and follow the directions you receive from the transplant team. They also get some information about your financial status and your health insurance to plan the best care for you. The transplant team assesses you in the following regards:

  • Whether you are healthy enough to tolerate the surgery and undergoing lifelong medication
  • If you take medications that would interfere with transplant success
  • Whether you are willing to take medications as it was prescribed

The evaluation process may take several days and include a physical exam, X-ray, MRI, and CT scan images, blood tests, psychological evaluation, or any other essential test that is ordered by your doctor. Each transplant center has its own criteria; therefore, you may apply to another center if you are not accepted as an eligible candidate in the previous center.


Blood Typing Test


Blood typing is the first blood test that needs to be done to determine if you and your donor have compatible blood. There are four basic blood types: A, B, O, and AB. It is preferred that the recipient and the donor have matched or compatible blood types. Rh factor (+, -) is not important in blood typing. O blood group is known as the universal donor because it is compatible with all the other blood types. AB is the universal recipient because it can receive from all the other blood types.

  • Donors with blood type A are matched with recipients having blood types A and AB
  • Donors with blood type B are matched with recipients having blood types B and AB
  • Donors with blood type AB are only matched with recipients having blood types AB
  • Donors with blood type O are matched with recipients having blood types A, B, O, and AB

When your blood type is similar to the new kidney’s blood, there is a lower risk that your immune system fights the new organ. A renal transplant with incompatible blood types is also possible; however, to reduce the risk of kidney rejection, it needs additional medical treatment before and after the transplant. This kind of transplant is known as an ABO-incompatible kidney transplant.

When the blood types are not compatible, you may also consider participating in a paired exchange program that lets you receive a kidney from another donor who is not matched with their intended recipient. For getting more information about your options, you can talk with your transplant coordinator.

Human Leukocyte Antigen (HLA) or Tissue Typing


After blood typing, the next step is tissue typing which is called human leukocyte antigen (HLA) typing. Tissues of Each person’s body are different from another person (except for identical twins). Antigens are found on body cells, mostly on white blood tests. The better the tissues are matched, the more successful the kidney transplant would be. The chance of tissue matching would be at least 50 percent between parents and their offspring. This chance for siblings is between zero to 100 percent, but for unrelated people, there is less chance for tissue matching. The best condition is when 12 out of 12 antigen markers match. If the results of tissue typing show a good match, the risk of kidney rejection is lower.



Crossmatch tests should be done multiple times, even within 48 hours before a kidney transplant. In this test, a small sample of the recipient blood is combined with a sample of the donor’s blood in the laboratory. This test shows whether your blood antibodies will react against specific antigens in the donor’s blood. If the crossmatch test shows a positive result, it means you have antibodies against the donor’s blood and you are not eligible to receive a kidney from that donor. If the transplant takes place under this condition, it will lead to immediate kidney rejection. If the crossmatch result is negative, it means your blood does not have antibodies reacting against the donor’s blood; therefore, you are compatible and eligible to receive a kidney from this donor.

Immunology and Serology


Immunology involves studies on the body’s immune system, its functions, components, types, and disorders. Serology refers to the study of antibodies existing in body fluids and blood. It often studies the blood serum to detect any transmissible diseases such as human immunodeficiency virus (HIV), COVID-19 infection, and hepatitis. Because transmissible diseases in the donor kidney can infect the recipient’s body, a serology test should be carried out before a renal transplant. The other tests that you may need to take according to your doctor opinion are:

  • Prostate exam for men
  • Mammogram and Pap smear for women
  • Heart and lung tests
  • Kidney and liver tests
  • Colon exam (colonoscopy)

Other factors


To find the most compatible donor kidney, your transplant team may consider additional factors including finding a donor who has a matching age or a kidney with similar size. Your doctor may order other tests to evaluate the risk of infection exposures.

If you would like to get more information about renal transplant procedure and its required tests, you may contact us through provided numbers and our online form.

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