Transplant Candidate Evaluation

Introduction

A transplant candidate is a patient with advanced chronic kidney disease (CKD) who is assessed for suitability to receive a kidney transplant as a form of kidney replacement therapy. Kidney transplantation offers improved survival, quality of life, and functional rehabilitation compared with long-term dialysis for appropriately selected patients.

All patients with CKD stage 4–5 should be informed, educated, and considered for kidney transplantation regardless of socioeconomic status, sex, or ethnicity. Early referral allows adequate time for assessment, preparation, donor evaluation, and planning for kidney replacement therapy.

Pre-emptive kidney transplantation, performed before the initiation of dialysis, is preferred when feasible. Referral for transplant assessment should ideally occur 6–12 months before anticipated initiation of kidney replacement therapy (RRT).

Active medical conditions should be identified and optimally controlled before transplantation to reduce complications and improve graft and patient outcomes.

Epidemiology

End-stage kidney disease is associated with substantial morbidity and mortality worldwide. Kidney transplantation remains the preferred kidney replacement therapy for suitable candidates because it provides better long-term outcomes compared with maintenance dialysis.

Access to transplantation varies globally and may be influenced by availability of transplant services, healthcare resources, donor availability, and socioeconomic factors. Early identification and referral of eligible patients improve access and transplant outcomes.

Indications for Kidney Transplant Assessment

Patients requiring transplant evaluation include:

• Chronic kidney disease stage 5.

• CKD stage 4 with progressive decline in kidney function.

• Patients approaching dialysis initiation.

• Patients suitable for pre-emptive kidney transplantation.

Common causes of kidney failure requiring transplantation include:

• Diabetic kidney disease.

• Hypertensive kidney disease.

• Chronic glomerular diseases.

• Polycystic kidney disease.

• Congenital kidney disorders.

• Chronic tubulointerstitial diseases.

Contraindications to Kidney-Only Transplantation

Some conditions require alternative approaches or correction before transplantation.

Kidney-only transplantation is generally not recommended in patients with:

• Multiple myeloma and AL amyloidosis.

• Decompensated liver cirrhosis.

• Severe irreversible obstructive or restrictive lung disease.

• Severe uncorrectable symptomatic cardiac disease.

• Progressive central neurodegenerative disease.

Each case should be assessed individually by a multidisciplinary transplant team.

Transplant Candidate Assessment

The evaluation aims to:

• Determine suitability for transplantation.

• Identify conditions requiring treatment before transplantation.

• Reduce perioperative risks.

• Assess ability to adhere to lifelong therapy.

• Optimize long-term transplant outcomes.

Psychosocial Assessment

Assessment should include:

• Understanding of transplantation process.

• Ability to adhere to immunosuppressive medications.

• Social support system.

• Mental health assessment.

• Financial and social barriers.

• Tobacco use assessment and avoidance counselling.

Patients should demonstrate commitment to lifelong follow-up and medication adherence.

Surgical Assessment

Surgical evaluation determines whether transplantation can be performed safely.

Assessment includes:

Obesity

• Evaluation of body mass index.

• Assessment of associated metabolic and surgical risks.

Anticoagulation

• Review of anticoagulant indication.

• Assessment of bleeding risk.

The need for anticoagulation is not an absolute contraindication but requires careful planning.

Vascular anatomy

Assessment of:

• Iliac vessels.

• Peripheral vascular disease.

• Anatomical suitability for kidney implantation.

Native kidney assessment

Particularly important in:

• Autosomal dominant polycystic kidney disease.

• Structural kidney abnormalities.

Urological assessment

Evaluation for:

• Urinary tract abnormalities.

• Previous urological disease.

• Suitability of urinary drainage.

Diabetes Screening

Diabetes assessment is essential because diabetes affects:

• Cardiovascular risk.

• Surgical outcomes.

• Long-term graft survival.

Assessment may include:

• Fasting blood glucose.

• HbA1c.

• Additional testing where indicated.

Cancer Screening

Cancer screening should continue before and after transplantation according to age and risk factors.

Assessment may include:

• Imaging studies.

• Cystoscopy where indicated.

• Colonoscopy for candidates with increased colorectal cancer risk.

Important considerations:

• A previous cured malignancy does not automatically exclude transplantation.

• Waiting period depends on malignancy type, stage, treatment response, and recurrence risk.

Pulmonary Disease Assessment

Evaluation includes:

• Respiratory history.

• Physical examination.

• Pulmonary function assessment where indicated.

Severe irreversible pulmonary disease may increase transplant risk and requires specialist review.

Cardiovascular Disease Assessment

Cardiovascular disease is a major cause of morbidity and mortality after transplantation; therefore, cardiovascular evaluation is essential.

Assessment includes:

• Clinical history and examination.

• Electrocardiogram (ECG).

• Echocardiography.

Additional testing may include:

• Stress echocardiography.

• Dobutamine stress echocardiography in candidates:

  • Above 40 years of age.

  • With risk factors for myocardial ischaemic disease.

Significant cardiac disease should be optimized before transplantation.

Peripheral Arterial Disease Assessment

All candidates should undergo:

• History taking.

• Physical examination.

Additional vascular imaging may be required if disease is suspected.

A vascular surgeon consultation may be necessary before transplantation.

Neurological Disease Screening

Assessment includes:

• History of neurological disease.

• Previous stroke or transient ischaemic attack (TIA).

Considerations:

• Candidates should generally wait approximately 6 months after stroke or TIA before transplantation assessment.

Patients with high-risk autosomal dominant polycystic kidney disease may require screening for:

• Intracranial aneurysms.

Gastrointestinal and Liver Disease Assessment

History and examination should exclude active:

• Peptic ulcer disease.

• Diverticulitis.

• Pancreatitis.

• Cholelithiasis.

• Inflammatory bowel disease.

• Liver disease.

Further investigations should be performed when clinically indicated.

Patients with significant liver disease may require combined liver-kidney transplant assessment.

Haematological Assessment

Assessment includes:

• Screening for thrombophilia in high-risk individuals.

• Antiphospholipid antibody testing where indicated.

The requirement for anticoagulation therapy is not an absolute contraindication but requires individualized assessment.

Immunological Assessment

Immunological evaluation is essential to reduce rejection risk.

Assessment includes documentation of sensitizing events such as:

• Previous blood transfusions.

• Pregnancy.

• Miscarriage.

Investigations include:

• Human leukocyte antigen (HLA) antibody testing during transplant evaluation.

• Assessment of donor-recipient compatibility.

Infection Screening

Candidates should be screened for infections including:

• Hepatitis B virus.

• Hepatitis C virus.

• Human immunodeficiency virus (HIV).

• Cytomegalovirus (CMV).

Other infection screening should be performed according to clinical risk and transplant centre protocols.

Active infections should be treated before transplantation whenever possible.

Differential Diagnosis of Poor Transplant Candidacy

Conditions that may explain unsuitability or require further evaluation include:

1. Active malignancy

   • Increased risk due to immunosuppression after transplantation.

2. Severe cardiovascular disease

   • Increased perioperative and post-transplant mortality risk.

3. Advanced pulmonary disease

   • Increased respiratory complications.

4. Chronic uncontrolled infection

   • Risk of severe infection after immunosuppression.

5. Severe liver disease

   • May require combined organ transplantation.

6. Severe psychosocial barriers

   • Risk of poor adherence and graft failure.

7. Progressive neurological disease

   • May limit rehabilitation and long-term outcomes.

Referral

Patients with CKD stage 4–5 should be referred early to nephrology and transplant services for:

• Education about transplantation.

• Candidate assessment.

• Donor evaluation where applicable.

• Preparation for kidney replacement therapy.

Early referral improves the possibility of pre-emptive transplantation and better patient outcomes.

Prognosis

Successful kidney transplantation can provide:

• Improved survival.

• Better quality of life.

• Reduced dependence on dialysis.

• Improved social and occupational functioning.

Outcomes depend on:

• Patient selection.

• Control of comorbidities.

• Immunological compatibility.

• Adherence to treatment.

• Long-term follow-up.