Living related kidney donors over 60 years old

The lack of available cadaveric organs for transplantation has resulted in an increased number of kidney transplants from living donors. During a period of 6 years, 149 kidney transplantations were performed from living related donors in our institute, 33.5% of whom were older than 60 years of age. In this study we examined the survival of patients and grafts as well as the graft function in 50 patients with transplants from donors over 60 years (mean age 65 years) as compared with those of 99 patients with transplants from donors younger than 60 years (mean age 47 years). There were no significant differences in the course of donor nephrectomy, postoperative complications, or remnant kidney function. However, delayed graft function occurred more frequently in recipients of transplants from older donors. Improvement in graft function was also slower in recipients of kidneys from older donors, with significant differences in serum creatinine levels observed during the first 12 months after transplantation. More frequent acute complications and more progressive chronic graft failure, irrespective of the causes, occurred during the 1st post-transplant year in recipients with grafts from older donors. Five-year patient survival (77% vs 92%) and kidney graft survival differed significantly for the same period with worse results for patients receiving grafts from older donors. It may be concluded that kidney grafts from donors older than 60 years — and especially those older than 70 years — may be used for living related kidney transplantation, but with precautions.     

Changing patterns in organ donation in Eurotransplant, 1990–1994

Abstract Organ transplantation has become the treatment of choice for patients with end-stage organ failure and has led to progressive increases in the size of waiting lists over the past decade. Unfortunately, from 1990 to 1994, the number of organ donors remained stable while the number of organs transplanted from these donors increased by only 10 %. In view of the severity of the current organ shortage, elderly individuals are increasingly being accepted as organ donors. The graft survival rate with kidneys from donors older than 55 years is 5 % lower than that with kidneys from younger donors at 1 year and 9 % lower at 3 years post-transplantation. Graft survival is also significantly lower with organs from donors who die from cerebrovascular accidents than it is with organs from donors whose cause of death is cerebral trauma. The number of patients waiting for a nonrenal donor organ has increased rapidly in the past 5 years, and an increasing number of donor kidneys are now being provided by multior-gan donors. The favorable graft survival rate with multiorgan donor kidneys, which is significantly better than that obtained with single organ donor kidneys, confirms their suitability for renal transplantation.     

Changing patterns in organ donation in Eurotransplant, 1990–1994

Organ transplantation has become the treatment of choice for patients with end-stage organ failure and has led to progressive increases in the size of waiting lists over the past decade. Unfortunately, from 1990 to 1994, the number of organ donors remained stable while the number of organs transplanted from these donors increased by only 10%. In view of the severity of the current organ shortage, elderly individuals are increasingly being accepted as organ donors. The graft survival rate with kidneys from donors older than 55 years is 5% lower than that with kidneys from younger donors at 1 year and 9% lower at 3 years post-transplantation. Graft survival is also significantly lower with organs from donors who die from cerebrovascular accidents than it is with organs from donors whose cause of death is cerebral trauma. The number of patients waiting for a nonrenal donor organ has increased rapidly in the past 5 years, and an increasing number of donor kidneys are now being provided by multiorgan donors. The favorable graft survival rate with multiorgan donor kidneys, which is significantly better than that obtained with single organ donor kidneys, confirms their suitability for renal transplantation.     

Intermediate outcomes of dual renal allografts: the University of Washington experience

PURPOSE: The increased survival advantage of renal transplantation with end stage renal disease combined with an increasing incidence of renal disease fuel an increasing disparity between supply and demand for transplantable kidneys. Despite efforts to increase cadaveric organ donation through education and publicity, the number of cadaveric kidneys transplanted has not increased and in the last year was surpassed by kidneys transplanted from living donors. In an effort to maximize cadaver organ donors use of kidneys from expanded criteria donors has been investigated. In select cases both donor kidneys have been transplanted into a single recipient, which is called dual renal transplant. We report on the 4-year dual renal transplant graft and patient outcomes and compare these to age matched single cadaver kidney transplants. MATERIALS AND METHODS: A retrospective review of 10 dual renal transplant recipients and 10 age matched single cadaver kidney recipients was performed. All patients underwent transplantation at our university between January 1996 and February 1998. Mean followup was 4.1 years (range 2.5 to 5.1) for the dual kidney recipients and 3.6 (0.0 to 5.5) years for the control group. RESULTS: Of the 10 dual renal transplant recipients 7 remain alive and 3 died of nontransplant related causes. Of the 10 single recipients 8 are alive, 1 died of postoperative complications and 1 died of nontransplant related causes. When censored for death with a functioning graft, 7 of 10 dual grafts are functioning at followup with a mean creatinine clearance of 39.4 ml. per minute (range 16.1 to 65.9) and mean serum creatinine of 2.0 mg./dl. (1.1 to 3.9). If not censored for death with a functioning graft, 50% of dual grafts are functioning. Of the 3 graft losses 2 were due to recurrent disease and 1 was attributed to chronic rejection. In the control group 8 of 10 grafts are functioning at current followup (regardless of censoring for death with a functioning graft) with a mean creatinine clearance of 48.7 ml. per minute (range 23.4 to 66.5) and mean serum creatinine of 1.6 mg./dl. (1.2 to 2.4). Of the 2 graft losses 1 resulted from postoperative complications and 1 was due to chronic rejection. CONCLUSIONS At the 4-year followup patients undergoing dual renal transplant have comparable graft function, incidence of graft loss and survival compared to the control group. However, because of our small sample size, differences in the 2 groups may be significant in a larger study. Additional studies need to be conducted to determine if this practice represents an acceptable use of kidneys from expanded criteria donors.     

Effect of donor age on the outcome of living-related kidney transplantation

The study compared the results of kidney transplantation from living-related donors older and younger than 60 years. The 273 kidney graft recipients were divided into group 1 (115 recipients of older grafts) and group 2 (158 recipients of younger grafts). The frequency of acute rejection (AR) episodes was similar in both groups but slow graft function occurred more frequently in group 1. The frequency of chronic renal allograft dysfunction in the first post-transplant year was significantly higher in group 1 than in group 2. Patient and graft survival was significantly worse in group 1. Risk factors for graft loss were the difference between donor and recipient age and AR. Donor age and graft function were risk factors for patient death. Although kidneys from older donors provide a statistically poorer transplant outcome, they are clinically acceptable, especially when waiting time is prolonged and access to dialysis limited.     

Old-for-Old Kidney Allocation Allows Successful Expansion of the Donor and Recipient Pool

Allocation of kidneys from donors older than 64 years to recipients older than 64 years was started in 1999 to improve use of older donor kidneys. Kidneys are allocated locally without HLA-matching to keep cold ischemia short. We compared survival and rejection rates in elderly patients allocated in the old-for-old program (ESP) to patients aged 60 years and older based on HLA-matching, expected ischemia and waiting time (ETKAS). The 69 ESP patients were older (67.9 +/- 2.5 vs. 63.9 +/- 2.9 years), had older donors (71.2 +/- 3.9 vs. 44.6 +/- 14.5 years) and more HLA-mismatches (4.2 +/- 1.2 vs. 1.6 +/- 1.7) than the 71 ETKAS patients, while ischemia was shorter (7.8 +/- 3.4 vs. 14.2 +/- 5.5 h). ESP and ETKAS had similar graft (1-year: 83.6% vs. 86.9%) and patient survival (85.2% vs. 89.5%). With the introduction of ESP, use of older recipients and donors rose from less than 2% to 16% and 11%, respectively. Incidence of acute rejections was significantly higher in the ESP group (1 year: 43.2% vs. 27.4%) and significantly correlated with the degree of HLA-matching. Introduction of old-for-old allocation allows successful expansion of the donor and recipient pool without affecting patient and graft survival. HLA-matching should not be ignored, as the risk of acute rejection in elderly patients is substantial.     

Kidneys from Deceased Donors: Maximizing the Value of a Scarce Resource

Donor age is a significant risk factor for graft loss after kidney transplantation. We investigated the question whether significant graft years were being lost through transplantation of younger donor kidneys into older recipients with potentially shorter lifespans than the organs they receive. We examined patient and graft survival for deceased donor kidney transplants performed in the United States between the years 1990 and 2002 by Kaplan-Meier plots. We categorized the distribution of deceased donor kidneys by donor and recipient age. Subsequently, we calculated the actual and projected graft survival of transplanted kidneys from younger donors with the patient survival of transplant recipients of varying ages. Over the study period, 16.4% (9250) transplants from donors aged 15-50 were transplanted to recipients over the age of 60. At the same time, 73.6% of donors above the age of 50 were allocated to recipients under the age of 60. The graft survival of grafts from younger donors significantly exceeded the patient survival of recipients over the age of 60. The overall projected improvement in graft survival, by excluding transplantation of younger kidneys to older recipients, was approximately 3 years per transplant. Avoiding the allocation of young donor kidneys to elderly recipients, could have significantly increased the overall graft life, by a total 27,500 graft years, between 1990 and 2002, with projected cost savings of about 1.5 billion dollars.     

A prospective study on size and function of paediatric kidneys (<10 years) transplanted to adults

BACKGROUND: There is increasing evidence that paediatric kidneys transplanted to adults have good graft function and satisfactory graft survival. The relationship between size increment and functional potential of paediatric kidneys following transplantation is not defined in detail. We therefore initiated a prospective single centre study, comprising detailed and repeated measurements of size and function of paediatric kidneys transplanted to adults. METHODS: Nineteen adults receiving a first kidney transplant from a paediatric donor (<10 years of age) were included in the study. All patients were followed for 12 months post-transplant. Increment in size and function of the transplanted kidneys were assessed by ultrasound, glomerular filtration rate (GFR) and effective renal plasma flow (ERPF). All tests were performed during the first week, post-transplant and subsequently repeated at 1, 3, 6 and 12 months. RESULTS: Kidney volume increased 2.6-fold at 12 months (P < 0.001). GFR and ERPF showed a slightly more moderate increase, 1.8-fold and 1.6-fold, respectively. Patient and graft survival at 1 year were 100% and serum creatinine was 91 micromol/l (66-169). CONCLUSION: The study indicates that paediatric kidneys for transplantation may be considered as excellent rather than being referred to as suboptimal for adult recipients, at least the first year after transplantation.     

Kidney Transplantation Using Elderly Non-Heart-Beating Donors: A Single-Center Experience

Although acceptable outcomes have been reported in both non-heart-beating (NHB) and elderly donors individually, the large pool of elderly NHB donors has not yet been fully utilized. In 1994, we expanded our transplant protocol to include NHB donors aged over 65 years and this study compares the clinical outcomes with regular NHB transplantations. Up to June 2005, 24 patients were transplanted at our center with kidneys from NHB donors aged 65 years or more, whereas 176 patients received grafts from conventional NHB donors during the same period. Grafts from older donors were associated with inferior glomerular filtration rates (29 vs. 44 mL/min after 1 year, p = 0.01) and graft survival (52% vs. 68% after 5 years, p = 0.19) compared to younger NHB donor grafts, although the difference in graft survival was not statistically significant. Exclusion of older NHB donor kidneys with severe vascular pathology resulted in similar graft survival of older and younger NHB donor kidneys. We conclude that the use of elderly NHB donors in order to expand the donor pool was associated with unacceptable clinical outcomes and cannot be justified without further refinement in their selection, for example, by histological assessment of pretransplant biopsies.     

Histological Assessment of Preimplantation Biopsies May Improve Selection of Kidneys from Old Donors After Cardiac Death

Kidneys from old donors after cardiac death (DCD) may increase the donor pool but the prognosis of these kidneys is unsatisfactory. To improve these results, we retrospectively evaluated the diagnostic utility of published selection algorithms for old donor kidneys. We studied all DCD kidney transplantations between January 1, 1994 and July 1, 2005 at our institution (n = 199). Selection algorithms were evaluated in the subset of kidney transplantations from donors aged 60 years or older (n = 52). For histological assessment of kidney biopsies, glomerulosclerosis, tubular atrophy, interstitial fibrosis and vascular narrowing were blindly scored. Functional kidney weight was calculated as renal mass multiplied by the fraction of nonsclerosed glomeruli. Graft function and survival of kidneys from DCD aged 60 years or older were inferior to those from younger DCD. Histological scores were associated with kidney function and graft survival of old DCD kidney transplantations. Functional kidney weight was associated with kidney function but not graft survival, while donor glomerular filtration rate (GFR), donor age and machine perfusion characteristics were associated with neither of the clinical outcomes of interest. We conclude that histological assessment of preimplantation biopsies may improve the selection of kidneys from old DCD and may therefore contribute to expansion of the donor pool.     

Long-term clinical outcome of paediatric kidneys transplanted to adults.

BACKGROUND: We have earlier shown an increase in the size and excellent graft function of paediatric kidneys transplanted to adults up to 1 year following transplantation. This study was performed to assess the long-term outcome of these transplants. METHODS: From a primary cohort of 19 adults, receiving a first kidney transplant from a paediatric donor <10 years of age, 16 patients were available for a complete long-term follow-up, 5-9 years post-transplant. Of these, eight patients were transplanted with a donor of <5 years. All medical files and registry data of the cohort, from the time of transplantation to the follow-up time point, were recalled and events were registered. The patients' general condition, body weight, blood and urine tests, blood pressure (BP), use of antihypertensive agents and GFR were recorded. To explore the temporal increment in the size of paediatric donor kidneys transplanted to adults, the maximal cranio-caudal length of the kidneys from the time of transplantation to follow-up was established by ultrasound. Volumes (length x width x thickness x pi/6) of en bloc kidneys versus single paediatric kidneys and adult-to-adult transplants were compared. RESULTS: Long-term (7 years, median) patient and graft survival was 95% and 89%, respectively. Mean serum creatinine was 85 micromol/l (range, 32-131). The mean estimated GFR was 84 ml/min/1.73 m(2). The mean BP was 134/79 mmHg (range, 120-185/70-90). The number of antihypertensive agents used was not statistically different from the number used at 1 year post-transplant. None of the patients had significant proteinuria as a sign of hyperfiltration injury of the graft. There were no statistically significant increases in the maximal cranio-caudal length of the transplanted kidney(s) from 1 year post-transplant to follow-up; however, the en bloc kidneys tended to be larger than single paediatric grafts (240 ml and 204 ml) and adult-to-adult grafts (170 ml). CONCLUSION: Paediatric kidneys transplanted to adults should be considered as excellent for transplantation on a long-term basis.     

The “oldest and coldest” shipped living donor kidneys transplanted through kidney paired donation

To date, thousands of living donor kidneys have been shipped through kidney paired donation (KPD). To expand on this growing segment of living donor transplantation, we evaluated the effect of advanced age donation (“oldest kidneys”) and prolonged cold ischemia time (“coldest kidneys”) on graft function and survival using the National Kidney Registry database from February 2008 to May 2018. Donors were stratified by age at time of donation (<65 or ≥65 years) and kidneys were stratified by cold ischemia time (<16 or ≥16 hours). We evaluated delayed graft function and death‐censored graft failure (DCGF) for up to seven posttransplant years. Of the 2363 shipped living donor kidney transplants, 4.1% of donors were ≥65 years and 6.0% of transplanted kidneys had cold ischemia times ≥16 hours. Delayed graft function and DCGF occurred in 5.2% and 4.7% of cases. There were no significant associations between delayed graft function and donor age (P = .947) or cold ischemia (P = .532). Donor age and cold ischemia time were not predictive of delayed graft function (OR = 0.86,1.20; P = .8, .6) or DCGF (HR = 1.38,0.35, P = .5, .1). These findings may alleviate concerns surrounding the utilization of kidneys from older donors or those originating from distant transplant centers.     

Impact of warm ischemia time on outcomes for kidneys donated after cardiac death Post-KAS

Prolonged warm (WIT) and cold (CIT) ischemia times are often important considerations in the discard of DCD kidneys, but their impact on post-transplant outcomes in the post-KAS era is unclear. We examined the association of ischemia time on delayed graft function (DGF) and death-censored graft failure for DCD kidneys. The 2018 SRTR SAF was utilized to identify post-KAS DCD kidney transplants occurring from 2015 to 2018. Relative risk and Cox regression were used to calculate risk of delayed graft function and hazard of death-censored graft failure, respectively. We identified 4,680 kidneys from DCD donors transplanted from 2015 to 2018 with recorded WIT and CIT times. Median WIT was 21.0 minutes (IQR 14.0-28.0), and CIT was 18.5 hours (IQR 13.9-23.5). The overall incidence of DGF was 42.7%. In a univariable relative risk regression model, extended CIT (24-30 hours:RR 1.37, 95% CI 1.15-1.77; >30 hours:RR 1.47, 95% CI 1.22-1.77) and WIT (20-40 minutes:RR 1.10, 95% CI 1.03-1.17) were associated with increased risk of DGF. When included in a multivariable model, neither prolonged CIT nor WIT were significantly associated with death-censored graft failure. Prolonged WIT and CIT are associated with increased DGF but not death-censored graft failure in recipients of DCD kidney transplants in the post-KAS era. Extended ischemia alone should not be used as a basis for discard or non-utilization of these organs.     

Improved Outcomes of Renal Transplantation from Cardiac Death Donors: A 30-Year Single Center Experience

Outcomes of renal transplantation from donation after cardiac death (DCD) donors over 30 years were analyzed. Between 1975 and 2004, 256 renal transplantations from DCD donors were performed. The recipients were divided into four groups according to a time period as follows: 1975-1979 (Group 1; n = 18), 1980-1989 (Group 2; n = 81), 1990-1999 (Group 3; n = 84) and 2000-2004 (Group 4; n = 73). Of the 256 transplanted kidneys from DCD donors, 38 (15%) functioned immediately after transplantation. The incidence of delayed graft function (DGF) was 72%. Warm ischemic time and total ischemic time were 7.4 +/- 9.4 min and 11.9 +/- 5.6 h, respectively. The overall graft survival rates at 1, 5 and 10 years were 80%, 72% and 53%, respectively. Graft survival rates in each group have continually improved over time (5-year graft survival; 23% vs. 64% vs. 74% vs. 91%, respectively). However, there was no significant difference in graft survival rates between the groups of patients who survived with a functioning graft for more than 1 year. A multivariate Cox regression analysis showed acute rejection and donor age to be independently associated with graft outcome. DCD donors are a valuable source of kidneys for transplantation with promising long-term outcomes.     

Pulsatile Perfusion Reduces the Incidence of Delayed Graft Function in Expanded Criteria Donor Kidney Transplantation

The use of expanded criteria donors (ECD) has been proposed to help combat the discrepancy between organ availability and need. ECD kidneys are associated with delayed graft function (DGF) and worse long-term survival. The aim of this study is to evaluate the impact of pulsatile perfusion (PP) on DGF and graft survival in transplanted ECD kidneys. From January 2000 to December 2003, 4618 ECD kidney-alone transplants were reported to the United Network for Organ Sharing. PP was performed on 912 renal allografts. The prognostic factors of DGF were analyzed using multivariate logistic regression analysis. Risk factors for reduced allograft viability were greater in donors and recipients of PP kidneys. Three-year graft survival of ECD kidneys preserved with PP was similar to cold storage (CS) kidneys. The incidence of DGF in PP kidneys was significantly lower than CS kidneys (26% vs. 36%, p < 0.001). Despite having a greater number of risk factors for reduced graft viability, the ECD-PP kidneys had similar graft survival compared to ECD-CS kidneys. The use of PP, by decreasing the incidence of DGF, may possibly lead to lower overall costs and increased utilization of donor kidneys.     

Lack of impact of donor age on patient survival for renal transplant recipients ≥60years

There has been an increase in the number of older patients on the transplant waiting list and acceptance of older donor kidneys. Although kidneys from older donors have been associated with poorer graft outcomes, whether there is a differential impact of donor age on outcomes in older recipients remains unclear. The aim of this study was to evaluate the effect of donor age on graft and patient survival in renal transplant (RT) recipients ≥60years. Using the Australia and New Zealand Dialysis and Transplant Registry, outcomes of 1,037 RT recipients ≥60years between 1995 and 2009 were analyzed. Donor age groups were categorized into 0-20, >20-40, >40-60, and >60years. Compared with recipients receiving donor kidneys >60years, those receiving donor kidneys >20-40years had lower risk of acute rejection (odds ratio 0.46, 95% CI 0.27, 0.79; P<0.01) and death-censored graft failure (HR 0.37, 95% CI 0.19, 0.72; P<0.01). There was no association between donor age groups and death. With a corresponding growth in the availability of older donor kidneys and the observed lack of association between donor age and patient survival in RT recipients ≥60years, preferential allocation of older donor kidneys to RT recipients ≥60years may not disadvantage the life expectancy of these patients.     

The use of elderly living donors in renal transplantation

The safety and the results of using living donors above the age of 60 years were studied. In 235 consecutive donors the complications were not different in elderly (n=70) compared to younger donors. Graft survival and function were studied in 232 consecutive 1-HLA-haplotype mismatched grafts. Graft survival at 1 year was equivalent (87% vs. 92%), but after 2–6 years graft survival was inferior in recipients of older grafts (n=62). The recipients of older grafts were 10 years older, and patient death with functioning graft was a more frequent cause of graft loss. Up to 4 years serum creatinine levels were significantly higher, but stable, in recipients of older grafts; at 5 years the difference was not significant. It is concluded that the use of elderly living donors is safe. Taking recipient age into consideration, graft survival is not different in the two groups. Graft function in older grafts is some what inferior, but stable.     

Kidney transplantation outcomes from expanded criteria donors,standard criteria donors or living donors older than 60 years

Objectives: To evaluate outcomes in kidney allograft recipients from donors with expanded criteria (ECD) versus standard criteria (SCD) or living donors (LD) >60 years. Methods: We studied all patients who received a kidney between 2005 and 2011, focusing in recipients of kidneys from deceased ECD, SCD and LD >60 years. ECD was any deceased donor >60 years or >50 years with two of the following: hypertension (HTN), stroke as the cause of death, or serum creatinine >1.5?mg/dL. We recorded characteristics of the transplant procedure, patient, graft survival and renal function 1 year after transplantation and at the end of follow-up. Results: Six-hundred and five patients were transplanted between 2005 and 2011 in our department. There were 142 (25.1%) transplantations from ECD, 192 (33.98%) from SCD and 96 (16.99%) from LDs older than 60 years. In a mean follow-up time of 36.4 months, graft survival rates were similar for all groups. Calculated GFR was found statistically different between the ECD and SCD groups, but still satisfactory at first year, and at end of follow-up time. Comparison of the patients, who received transplants from ECD, even older than 70 years, and those from LD >60 years revealed equivalent renal function in short and long term. Conclusions: Utilization of marginal kidneys effectively doubled our deceased transplant volume in the period 2005–2011. Patients’ and graft survival were shown similar at the end of follow-up for all groups. Renal outcomes were shown equivalent between the ECD and LD >60 years groups, and although significantly lower between the ECD and the SCD group, were still very satisfactory.     

Outcomes of Adult Dual Kidney Transplants by KDRI in the United States

UNOS guidelines provide inadequate discriminatory criteria for kidneys that should be transplanted as single (SKT) versus dual (DKT). We evaluated the utility of the kidney donor risk index (KDRI) to define kidneys with better outcomes when transplanted as dual. Using SRTR data from 1995 to 2010 of de novo KTX recipients of adult deceased‐donor kidneys, we examined outcomes of SKT and DKT stratified by KDRI group ≤1.4 (n = 49 294), 1.41–1.8 (n = 15 674), 1.81–2.2 (n = 6523) and >2.2 (n = 2791). DKT of kidneys with KDRI >2.2 was associated with significantly better overall graft survival [adjusted hazard ratio (aHR) 0.83, 95% confidence interval (CI) 0.72–0.96] compared to single kidneys with KDRI >2.2. DKT was associated with significantly decreased odds of delayed graft function (top 2 KDRI categories) and significantly decreased odds of 1‐year serum creatinine level >2 mg/dL (top 3 KDRI categories). Among SKT and DKT from KDRI >2.2 there were 16.1 and 13.9 graft losses per 100 patient follow‐up years, respectively. KDRI >2.2 is a useful discriminatory cut‐off for the determination of graft survival benefit with the use of DKT; however, the benefit of increased graft years was less than half of single kidneys from donors in the same KDRI range.     

Transplantation of kidneys from pediatric cadaver donors to adult recipients

Pediatric donors (less than 12 years old) are a potentially important source of kidneys for adult recipients. Previous reports of decreased graft survival and increased complication rates have made surgeons wary of using such kidneys. In 64 kidneys from younger donors transplanted to adult recipients the delayed graft function rate (41 versus 42%), and 2 and 3-year graft survival rates (67 versus 72% and 61 versus 65%, respectively) were similar to those seen with kidneys from adult donors. Kidneys from donors 24 months old or less experienced an 80% rate of graft loss at 1 year. When these kidneys are excluded the 1-year graft survival rate was similar to kidneys from older and younger donors (70 versus 77%). Mean serum creatinine at 1 year was similar in both groups (155 +/- 21 versus 151 +/- 10). Pediatric kidneys except those obtained from donors 2 years old or less are suitable for adult recipients. However, kidneys from very young donors may be more appropriate to pediatric recipients.