By Hendra Lukman 
A groundbreaking nationwide study has unveiled a sobering truth about the kidney transplant process in the United States: a significant majority of patients who are identified as needing a new kidney never even begin the rigorous evaluation required to be considered for a life-saving donor organ. The research, published online on June 20th in the Journal of the American Society of Nephrology, reveals that a staggering 48% of patients referred for a kidney transplant never initiate the evaluation. Even more alarmingly, fewer than one in five, or just 19%, successfully navigate this complex initial phase to secure a coveted spot on the national transplant waitlist.
This comprehensive analysis, the largest and most detailed of its kind to date, shines a critical spotlight on the often-overlooked pre-waitlist phase of kidney transplantation. While much public and research attention is typically directed toward patients once they have been placed on the waitlist, this study underscores a profound gap in understanding what transpires before that critical milestone and, more importantly, why so many individuals fall by the wayside.
Unveiling the Major Hurdles to Kidney Transplant Waitlisting
The study, spearheaded by a team of researchers at NYU Langone Health, meticulously analyzed data from an extensive cohort of 720,348 patients who were referred for kidney transplantation between 2014 and 2025. Utilizing the vast Epic Cosmos database, which encompasses over 300 million electronic health records from more than 1,850 hospitals, including a substantial portion of US transplant centers, the researchers were able to track patients through four distinct stages: referral, evaluation, waitlisting, and ultimately, transplant.
The findings paint a stark picture of profound disparities in who is able to advance through the transplant pathway. The research identified several key demographic and socioeconomic factors that significantly impede a patient’s progress. Individuals who were unmarried, struggled with severe obesity, or resided in rural communities were found to be statistically less likely to initiate or complete a transplant evaluation, and consequently, less likely to reach the waitlist.
The challenges were even more pronounced for certain vulnerable populations. Older adults, Spanish speakers, and individuals with lower incomes faced substantially greater obstacles in navigating the system. Furthermore, the geographical location of care and the type of transplant center also played a role. Patients receiving care at smaller transplant centers or those located in the Southern United States were observed to have a reduced likelihood of moving forward in the process.
"Our findings suggest that a substantial proportion of people who need a new kidney fall out of the process long before they reach the waitlist, let alone make it to the operating room," stated Dr. Conor Donnelly, the study’s lead author and a resident and PhD student in the Department of Surgery at NYU Grossman School of Medicine. "Which transplant center you go to, where you live, and even whether you are married all appear to influence your chances of moving forward to the waitlist for a new kidney."
The Complexities of the Transplant Evaluation Process
The arduous nature and inherent complexity of the transplant evaluation process itself are identified as significant contributors to the observed dropout rates. After an initial referral, patients are required to undergo an extensive medical assessment designed to ascertain their overall health and suitability for a major surgical procedure and lifelong immunosuppression. This typically involves a battery of tests, including comprehensive blood work, chest imaging, rigorous cancer screenings, and various other specialized examinations.
This multi-faceted evaluation often necessitates multiple appointments spread over several months, all while the patient continues to manage their ongoing dialysis treatments, which are themselves time-consuming and physically demanding. Only after successfully completing all these requirements and receiving the approval of the transplant team can a patient officially be added to the national transplant waitlist.
The study’s authors also pointed to potential limitations at smaller transplant centers. These facilities may possess fewer resources and a smaller volume of transplant opportunities, which could lead to a more stringent or selective approach when evaluating potential candidates. Additionally, the researchers noted that patients who are unmarried or have limited social support may encounter greater difficulties in arranging transportation to and from frequent appointments, or in securing the necessary assistance for pre- and post-operative care, thereby hindering their ability to progress.
The stark contrast in progression rates between urban and rural populations further supports this observation. Patients living in urban areas, where transplant centers are often more concentrated and accessible, generally demonstrated a higher likelihood of continuing through the evaluation process. This suggests that proximity and ease of access to specialized medical facilities play a crucial role in patient outcomes.
A Deep Dive into Kidney Transplant Dropout Rates
The research, presented at the prestigious American Transplant Congress, a joint annual meeting of the American Society of Transplantation and the American Society of Transplant Surgeons, represents a significant advancement in understanding the kidney transplant pathway. By employing advanced statistical modeling, the research team was able to meticulously evaluate how a multitude of factors, including age, sex, pre-existing medical conditions, geographic location, and importantly, social vulnerability, impacted a patient’s likelihood of advancing from one stage to the next.
Social vulnerability, as defined in the study, encompasses a broad spectrum of challenges related to an individual’s living conditions and their access to essential healthcare services. Factors such as poverty, unstable housing situations, and limited transportation options were all identified as potential impediments that can make the already intricate process of navigating complex medical systems even more arduous for patients.
"These results demonstrate that finding ways to reduce barriers to both evaluation and waitlisting could help expand much-needed access to kidney transplantation," emphasized Dr. Allan B. Massie, a study co-senior author and associate professor in the Departments of Surgery and Population Health at NYU Grossman School of Medicine. "Providing patients with better education and support to help them navigate the complex and sometimes grueling process would be a good start."
Echoing this sentiment, Dr. Michal A. Mankowski, another co-senior author and assistant professor in the Department of Surgery at NYU Grossman School of Medicine, stated, "Our findings highlight the need to better support patients in progressing from referral to the waitlist, where many possibly eligible individuals are not ultimately listed." Dr. Mankowski indicated that future research will adopt a similar analytical approach to other types of organ transplantation, acknowledging that the journey to the waitlist can vary significantly across different organ systems.
The study’s extensive scope and rigorous methodology provide a robust foundation for future interventions aimed at improving equity and access within the kidney transplant system. The implications of these findings are far-reaching, suggesting a critical need for systemic changes that address the multifaceted barriers faced by patients.
Broader Impact and Implications: Towards Equitable Access
The implications of this landmark study extend beyond the immediate realm of kidney transplantation. The identification of specific demographic and socioeconomic factors that hinder progress underscores a systemic issue of inequity in healthcare access. The findings serve as a potent call to action for policymakers, healthcare providers, and transplant centers to re-evaluate current protocols and develop targeted strategies to support vulnerable patient populations.
One of the most significant takeaways is the clear evidence that social determinants of health play a pivotal role in transplant candidacy. Poverty, lack of reliable transportation, language barriers, and unstable housing are not merely social issues; they are directly linked to a patient’s ability to access and complete essential medical evaluations. This necessitates a more holistic approach to patient care, one that integrates social support services directly into the transplant evaluation process.
The study’s emphasis on the variation between transplant centers also suggests a need for standardization and resource allocation. While smaller centers may face inherent limitations, ensuring that all patients, regardless of their geographic location or the size of their treatment facility, have access to comparable levels of support and information is crucial. This could involve developing regional collaboration models, enhancing telehealth capabilities for consultations, or providing mobile evaluation units for rural communities.
Furthermore, the research highlights the importance of patient education and advocacy. The complexity of the transplant evaluation process can be overwhelming, particularly for individuals who may have limited health literacy or are navigating multiple systemic challenges. Enhanced patient navigation programs, culturally sensitive educational materials, and dedicated patient advocates could significantly improve engagement and adherence to the evaluation requirements.
The disparities observed in the study, particularly concerning race and ethnicity (implied by the mention of Spanish speakers facing greater challenges), also point to the need for culturally competent care. Transplant teams must be equipped to address the unique needs and concerns of diverse patient populations, fostering trust and open communication throughout the process.
The chronological aspect of the study, tracking patients from 2014 to 2025, provides a longitudinal perspective on these persistent challenges. While efforts have been made over the years to improve transplant access, this research indicates that significant obstacles remain, demanding renewed and intensified focus.
The financial implications of delayed or missed transplants are also considerable. The long-term costs associated with managing end-stage renal disease through dialysis are substantial. By facilitating more successful transitions to transplantation, the healthcare system could potentially achieve long-term cost savings while simultaneously improving patient quality of life and longevity.
In conclusion, this comprehensive study offers invaluable insights into the critical pre-waitlist phase of kidney transplantation. It unequivocally demonstrates that the path to a new kidney is fraught with systemic barriers that disproportionately affect vulnerable populations. Addressing these challenges requires a multi-pronged approach, encompassing policy changes, enhanced patient support, improved resource allocation for transplant centers, and a renewed commitment to health equity. The ultimate goal must be to ensure that every individual who could benefit from a kidney transplant has a fair and equitable opportunity to undergo evaluation and be placed on the waitlist, bringing the promise of a longer, healthier life within reach.
The research team included numerous NYU Langone collaborators: Suhani Patel, MPH; Syed Ali Husain, MD, MPH; Sommer E. Gentry, PhD; Bonnie E. Lonze, MD, PhD; Sunjae Bae, MD, PhD; Babak J. Orandi, MD, PhD; Mara A. McAdams DeMarco, PhD; and Dorry L. Segev, MD, PhD. Additional collaborators were Rachel Patzer, PhD, MPH, of Indiana University and David Axelrod, MD, of University Hospitals. Dr. Orandi has disclosed an advisory board role with Boehringer Ingelheim, with NYU Langone managing this relationship per its policies. The study was funded by NYU Langone Health.
