11.1 Kidney Transplant I: Candidacy, Living Donors & the Early Post-Transplant Period

Why transplant belongs on the CSR exam

Kidney transplantation is the preferred kidney replacement therapy for eligible patients, and the CSR outline lists transplant as a treatment setting in Domain 2. The CDR reference list includes the KDIGO transplant-recipient guideline and State Operations Manual Appendix X, the survey guidance for transplant programs. A renal dietitian may meet a transplant patient at three points: in the dialysis unit before listing, on the transplant team, or in clinic years later when the graft is failing.

Regulatory duties before transplant

The dialysis facility's duties come from the ESRD Conditions for Coverage:

• The comprehensive assessment must evaluate suitability for transplant referral, using criteria developed by the prospective transplant center. If the patient is not referred, the reason must be documented (42 CFR 494.80(a)(10)).
• The plan of care must document the transplant plan, the patient's decision to decline referral, or the reason for non-referral (§494.90(a)(7)(ii)).
• The interdisciplinary team must track referral results, monitor wait-listed patients, and communicate with the transplant center at least annually and whenever candidate status changes (§494.90(c)).
• Waitlisting is also a quality measure. The PY 2028 ESRD Quality Incentive Program includes Percentage of Prevalent Patients Waitlisted (PPPW) as a clinical measure.

Transplant programs have their own Medicare conditions of participation. Under 42 CFR 482.94(e), a transplant program must make nutritional assessments and diet counseling, furnished by a qualified dietitian, available to all transplant patients and living donors. The regulation defines a qualified dietitian as someone who meets state practice requirements and is registered with CDR.

Nutrition issues in transplant candidacy

Each center sets its own listing criteria. Nutrition findings that commonly delay or block listing include:

• Obesity. Many programs set an upper BMI limit. KDIGO's candidate guidance favors assessing body composition and risk rather than excluding on BMI alone. Dietitians help with supervised weight loss; some candidates use GLP-1 receptor agonists or bariatric surgery. After bariatric surgery, watch for enteric hyperoxaluria and micronutrient deficiencies.
• Protein-energy wasting and frailty. Low muscle mass and frailty predict poor surgical outcomes. Build strength and nutrient reserves before surgery with MNT, supplements and exercise referral.
• Uncontrolled diabetes, adherence concerns and substance use are evaluated by the team, often with dietitian input on diet history and self-management.

Candidate education should prepare the patient for the diet change after transplant. Many restrictions (potassium, phosphorus, fluid) usually ease, while sodium control, weight management, glucose control and food safety become central.

Living donors

Living donors are evaluated for kidney health, blood pressure, glucose and weight. The dietitian may assess diet quality, counsel on reaching a healthy weight before donation, and after donation reinforce a heart-healthy pattern with moderate sodium, weight maintenance and avoidance of NSAIDs. A donor with one kidney has less reserve, so long-term blood pressure and weight control matter.

The early post-transplant period (about the first 6–8 weeks)

Surgery, high-dose corticosteroids and fluid and electrolyte shifts make the first weeks catabolic. Commonly cited targets (Academy and NKF transplant nutrition references) are:

KDOQI 2020 statement 6.3.3 says that for adults after transplant with hypophosphatemia, it is reasonable to prescribe a high-phosphorus intake (diet or supplements) to replete serum phosphate. The same guideline extends its energy statement (25–35 kcal/kg for stable patients), sodium limit (<2.3 g/day) and potassium individualization to transplant recipients.

Delayed graft function. If the new kidney does not work right away, the patient may need dialysis for days or weeks. Nutrition then follows dialysis-level protein needs and individualized fluid, potassium and phosphorus limits until urine output recovers.

Hyperglycemia after transplant

Corticosteroids and tacrolimus impair insulin secretion and action. Transient hyperglycemia is common right after surgery. The international consensus on post-transplant diabetes mellitus (PTDM) advises making the formal diagnosis only once the patient is stable on maintenance immunosuppression. Early on, the dietitian teaches consistent carbohydrate intake and works with the team on insulin plans.

Food safety

Immunosuppression raises the risk of foodborne illness (Listeria, Salmonella, Toxoplasma, norovirus). The federal food-safety guidance for transplant recipients advises:

• no raw or undercooked meat, poultry, eggs, fish or shellfish (including sushi and raw oysters);
• no unpasteurized milk, cheese or juice, and no soft cheeses made from unpasteurized milk;
• heating deli meats and hot dogs until steaming hot;
• no raw sprouts;
• careful washing of produce, prompt refrigeration and separate cutting boards for raw meat.

Teach these before discharge and repeat them at follow-up. The risk lasts as long as immunosuppression continues.

Drug–food interactions to teach at discharge

• Grapefruit, pomelo and Seville orange raise tacrolimus and cyclosporine levels. St. John's wort lowers them.
• Tacrolimus should be taken the same way relative to meals every day, because food changes its absorption.
• Mycophenolate commonly causes nausea and diarrhea, which can drive weight loss and electrolyte losses.

Coverage notes that affect nutrition care

Medicare Part B covers medical nutrition therapy for 36 months after a kidney transplant (42 CFR 410.130). For people entitled to Medicare only because of kidney failure, Medicare ends 36 months after a successful transplant. Since 2023, the Part B immunosuppressive drug benefit (Part B-ID) lets eligible people keep immunosuppressant coverage after that date.