# Nearly half of patients referred for a kidney transplant drop out > Introduction: the invisible journey before the waiting list - Author: Maxime Marquette - Publisher: MadMax (https://mad-max.co) - Section: Investigation - Published: 2026-07-04 - Canonical URL: https://mad-max.co/en/article/pres-de-la-moitie-des-patients-referes-pour-une-greffe-renale-abandonnent ## Key takeaways - Only 19% of referred patients complete the evaluation and join the waiting list, and 10% ultimately receive a transplant. - Evaluation is demanding: it involves multiple appointments over months, while patients keep attending dialysis. Median times were two months to start evaluation and four more months to reach the waitlist. - Factors linked to lower progression include being unmarried, severe obesity, living in a rural area, and social vulnerability such as poverty, unstable housing, and limited transportation. - Reasons for non-progression included not meeting criteria (18%), personal choice (13%), being unreachable (12%), financial or insurance problems (7%), and death (4%). - The lead and senior authors argue that better logistical support, education, and follow-up could reduce attrition rather than simply filtering patients out. ## Introduction: the invisible journey before the waiting list ### A study that challenges common assumptions We often **imagine** that a patient referred for a **kidney transplant** enters an almost automatic, linear path toward the waiting list. A large study led by researchers at **NYU Langone Health** and the **NYU Grossman School of Medicine**, published online on **June 20, 2026** in the Journal of the American Society of Nephrology, shows that the **reality is far more fragmented** and far more discouraging. The study analyzed **720,348 patients** referred for a kidney transplant between **2014 and 2025**, drawing on data from the **Epic Cosmos** platform, which pools more than **300 million electronic medical records** from more than **1,850 hospitals**, or over a **third of American transplant centers**. ### The number that stands out the most The **central finding** of this research is as simple as it is troubling: **48% of referred patients** never even begin the evaluation process required to be considered for an organ donation. Only **19% of patients** complete that evaluation and secure a spot on the transplant waiting list. An even lower figure deserves highlighting: only **10% of referred patients** ultimately receive a transplant. These **numbers** are not about a handful of isolated cases. They involve nearly three-quarters of a million people tracked over more than a decade, making this, according to the researchers themselves, the **largest and most detailed study to date** on the breaking points along the kidney transplant journey in the United States. *I expected disappointing numbers digging into this story, but not to this extent. Nearly one out of every two referred patients dropping out before even starting the evaluation isn't a statistical footnote: it's a system losing half its people along the way.* ## What "evaluation" actually means ### A demanding, lengthy medical journey The **evaluation** for a kidney transplant is not a simple administrative formality. It is a **comprehensive medical workup** designed to assess a patient's overall health, including **blood tests**, **chest imaging**, **cancer screenings**, and various other exams. This **process** generally requires **multiple appointments** spread over several months. Throughout this **evaluation period**, patients must also keep showing up to their **regular dialysis sessions**, which in practice means juggling already physically demanding treatments with a series of additional exams. Only after **completing all** these requirements and receiving approval can a patient be added to the transplant waiting list. ### The concrete timelines revealed by the study According to the study's **detailed data**, the median time to begin evaluation, among patients who actually start it, is **two months after the initial referral**. The median time to then reach the waiting list, once evaluation begins, is **four additional months**. That means, at minimum, **several months of sustained effort** demanded of a patient already weakened by kidney failure. These **timelines**, combined with the physical toll of dialysis, help explain why so many patients drop out along the way, without this necessarily reflecting a medical rejection of their candidacy. *Asking someone on dialysis to juggle appointment after appointment for months, all while managing fatigue and anxiety, is an obstacle course that official statistics rarely present as such.* ## The weight of marital status and social support ### A factor you wouldn't expect in a medical file Among the **most surprising findings** of the study is the influence of **marital status** on the likelihood of progressing through the process. Patients who have never been married show a **reduced likelihood** of beginning evaluation, with a relative risk of **0.94** compared to married patients, according to the study's **precise published data**. This factor is partly explained by the process's **implicit logistics**: repeated appointments often require **transportation**, accompaniment, and logistical support that people with a **limited social or family network** find harder to sustain over several consecutive months. ### Why this factor deserves special attention **Dr. Conor Donnelly**, the study's **lead author** and a surgical resident-researcher at NYU Grossman School of Medicine, summed up this reality bluntly: **"The transplant center you go to, where you live, and even whether you're married or not, all seem to influence your chances of moving forward on the waiting list for a new kidney."** This **quote illustrates** just how much factors that at first glance have nothing to do with medicine, like marital status, can have a measurable impact on real access to a life-saving treatment. It is not a question of medical merit, but of logistical capacity to sustain a demanding process. *The fact that being single can statistically reduce your chances of getting a kidney transplant strikes me as one of the most unjust blind spots in this system, precisely because no one consciously chooses to be penalized for their marital status.* ## Severe obesity, a documented obstacle ### A factor that weighs heavily on the statistics The study **identifies** **severe obesity** as one of the most decisive factors behind a reduced likelihood of beginning evaluation, with a relative risk of just **0.70** compared to patients without this condition. This is one of the sharpest gaps among all the factors measured in this research. This **gap** is partly explained by legitimate surgical considerations: severe obesity can indeed complicate a transplant procedure and increase certain post-operative risks. But the **size of this gap** raises the question of whether the criteria applied are uniformly fair, or whether they sometimes exclude patients who, with proper support, could still benefit from a transplant. ### What this means for health policy **Dr. Allan B. Massie**, associate professor in the departments of surgery and population health at NYU and **senior co-author** of the study, said: **"These results demonstrate that finding ways to reduce barriers to both evaluation and waitlisting could help expand much-needed access to kidney transplantation."** He added: **"Providing patients with better education and support to help them navigate this complex and sometimes grueling process would be a good place to start."** This **statement** points to a concrete path forward: rather than simply excluding patients with elevated risk factors, some centers could invest more heavily in personalized support that helps these patients overcome the logistical and medical obstacles identified by the study. *What strikes me most is the nuance Dr. Massie brings: he's not saying the medical criteria are unfair, he's saying better support could change the outcome. That's a path of measured hope, not a promise of miracles.* ## Geography, a factor too often underestimated ### Rural areas particularly disadvantaged **Patients living** in **rural zip codes** also show a reduced likelihood of beginning evaluation, with a relative risk of **0.98**. While this **gap is more modest** than the one associated with severe obesity, it remains statistically significant across a sample of more than 720,000 patients, and it adds to other well-documented geographic barriers within the American health care system. According to the study, **patients living** in **urban areas** were generally more likely to progress through the process, in part because transplant centers tend to be more physically accessible there, reducing the logistical burden of the repeated travel required by the evaluation. ### The regional factor that surprises Another **striking finding** concerns institutional geography: **programs located in the southern United States** were overall less likely to advance their patients through the process, compared to other regions of the country. **Smaller transplant centers** also showed a reduced relative transplant rate, with a relative risk of **0.92**, likely due to more limited resources that make them more selective in evaluating candidates. These **regional and institutional gaps** mean, in practice, that two patients with a similar medical profile could have very different odds of getting a transplant, simply based on where they live and which medical center they were referred to. *The fact that something as arbitrary as a zip code can influence access to a vital organ reminds me that American medical geography remains deeply unequal, well beyond the specific issue of kidney transplants.* ## Social vulnerability, a revealing composite factor ### Poverty, unstable housing, and limited transportation The study **highlights** the role of **social vulnerability** as a whole, a factor that reflects challenges tied to living conditions and access to care. Among the examples cited by the researchers are **poverty**, **unstable housing**, and **limited transportation options**, three realities that, combined, can make simply showing up to repeated medical appointments over several months extremely difficult. **Lower-income patients**, older individuals, and **Spanish-speaking patients** also face heightened challenges according to the study's data, painting a picture in which socioeconomic and language-based inequalities layer on top of the purely medical obstacles already documented. ### Why so many patients are removed from the process Among patients who never progress to evaluation at centers that documented the reasons for this non-progression, **18%** simply did not meet the criteria or were not deemed candidates, **13%** made the personal decision not to continue, **12%** simply could not be reached by their medical team, **7%** faced financial or insurance complications, and **4%** died before being able to progress further. This **last figure**, though the smallest in proportion, is a reminder of the human urgency behind these statistics: every additional month of delay in an already lengthy process represents a real risk for patients whose health can deteriorate quickly while waiting for a transplant. *Seeing that 12% of patients are simply "unreachable" troubles me in particular. It's neither a medical rejection nor a personal choice: it's a communication breakdown that could, in theory, be fixed with better follow-up systems.* ## What researchers propose as concrete solutions ### Better support rather than simple filtering **Dr. Michal A. Mankowski**, assistant professor in the department of surgery at NYU and also a senior co-author of the study, summed up the central issue: **"Our results highlight the need to better support patients as they move from referral to waitlisting, where many potentially eligible people are ultimately never listed."** This statement reframes the debate: the problem is not purely medical, it is also **organizational and human**. The researchers suggest that targeted interventions, such as stronger logistical support for socially isolated patients, or education programs tailored to the language barriers identified, could reduce a significant share of this attrition without requiring a complete overhaul of the current system. ### A presentation before the scientific community These findings were presented at the **American Transplant Congress**, held in **Boston from June 20 to 24, 2026**, an annual conference jointly organized by the American Society of Transplantation and the American Society of Transplant Surgeons. This presentation before expert peers reinforces the scientific credibility of the conclusions, which underwent peer review before publication in a recognized journal in the field. It is worth noting, in the interest of transparency, that some researchers involved in this study disclosed ties to the pharmaceutical industry, notably **Dr. Babak J. Orandi**, who served on an advisory board for the company Boehringer Ingelheim. These ties are publicly disclosed and managed according to NYU Langone Health's internal policies. *I'd rather mention these pharmaceutical industry ties than stay silent about them. This doesn't discredit the study, but transparency about potential conflicts of interest is part of honest science journalism.* ## The financial barrier and insurance complications ### A factor too often minimized in public debate Among patients removed from the process at centers documenting their reasons, **7% of cases** are directly attributable to **financial or insurance complications**. This figure, while a minority compared to medical criteria, reveals a well-known American reality: even a medically justified process can fail simply because a patient lacks the means or coverage needed to keep going. The cumulative cost of the required exams, repeated travel, and sometimes lost income from missing work to attend evaluation appointments can represent a real obstacle for lower-income patients, particularly those who already combine several of the vulnerability factors identified by the study. ### What this reveals about the limits of the current system The American health care system, with its fragmented insurance structure, adds a layer of complexity that other countries with universal health care systems don't necessarily face to the same degree. A patient referred for a kidney transplant should, in theory, never drop out of the process purely for financial reasons, but this study's data suggests that is exactly what happens for a measurable share of the population studied. This financial dimension of the problem extends well beyond the strictly medical realm, and it is a reminder that improving access to kidney transplantation likely cannot be limited to clinical reforms alone: it will also require addressing the structural economic barriers affecting the most vulnerable patients. *The fact that a patient could drop out of a life-saving evaluation for purely financial reasons, in the richest country in the world, remains for me one of the hardest injustices in this story to accept.* ## Conclusion: measured hope, not a promised miracle ### What this study changes concretely, and what it does not yet change This research offers no **miracle treatment** and no immediate solution to the chronic shortage of organs available for transplantation. Instead, it offers a **precise map**, unprecedented in scale, of the exact points where the current system loses patients who could potentially benefit from a kidney transplant. This is an important scientific contribution, but it has not yet been translated into concrete health policy at the national level. Nothing in the available data guarantees that American transplant centers will quickly adopt the researchers' recommendations. Implementing stronger support programs requires human and financial resources that not every center, particularly smaller ones, necessarily has. ### Why this statistical transparency remains valuable regardless Simply quantifying precisely where and why patients drop out, with numbers as robust as those drawn from 720,348 medical records, already represents a significant step toward guiding future targeted interventions. This transparency allows transplant centers, insurers, and public health decision-makers to identify exactly where to focus improvement efforts. For patients currently waiting for a kidney transplant, this study offers no immediate solution to their personal situation. But it represents a concrete step toward a potentially fairer system, provided its findings genuinely translate into changes in practice in the years ahead. *I'm closing this piece with measured hope, never a promised miracle. This study cures no one, but it finally puts precise numbers on a problem many patients and families were already living through, without ever being able to name it this clearly.* **By Maxime Marquette, columnist** ## Columnist's transparency note ### Editorial stance I am not a journalist but a **columnist and analyst**. My expertise lies in observing and analysing the geopolitical, economic and strategic dynamics that shape our world. My work is to take political strategies apart, to understand global economic movements, to put the decisions of international actors in context and to offer analytical perspectives on the changes that are redefining our societies. I do not claim the cold objectivity of traditional journalism, which stops at reporting facts. **I claim analytical clarity**, rigorous interpretation and a deep understanding of the complex issues that concern us all. My role is to give meaning to the facts, to place them in their historical and strategic context, and to offer a critical reading of events. ### Method and sources This text keeps the basic distinction between **verified facts and interpretive analysis**. The rule never changes: a factual claim is published only when a verifiable source supports it, and the sources this article actually used are listed under **Sources**, never here. **Primary source families** used by the publication, when the story has them: official statements from governments and international institutions, public statements by political leaders, reports from intergovernmental organisations, dispatches from recognised international news agencies. **Secondary source families**: specialised publications, internationally recognised news media, analyses from established research institutions, reports from industry organisations. When an article cites statistical, economic or geopolitical data, it comes from the institutions that produce it (intergovernmental organisations, central banks, national statistics offices), and the exact institution is named under **Sources**. ### Nature of the analysis The analyses, interpretations and perspectives in the analytical sections of this article are a **critical, contextual synthesis** based on the information available, the trends observed and the expert comments cited in the sources consulted. My role is to interpret these facts, to set them in the context of today's geopolitical and economic dynamics, and to give them a coherent meaning within the larger story of the changes shaping our time. These analyses reflect expertise built through continuous observation of international affairs and an understanding of the strategic mechanisms that drive global actors. This article describes a documented state of affairs on its publication date, not a prediction: later developments may shift its outlook. No update is promised in advance; when an article is corrected or completed, the change is dated in the text. ## Sources ### Primary sources - [ScienceDaily — Nearly half of patients awaiting a kidney transplant never begin the process, July 2026](https://www.sciencedaily.com/releases/2026/06/260623014006.htm) - [Clinical Briefing Report — Many patients referred for a kidney transplant do not even begin evaluation, July 2, 2026](https://clinicalbriefingreport.com/physicians-briefing/atc-many-referred-for-kidney-transplant-do-not-even-initiate-evaluation) - [ScienceDaily — Public health section](https://www.sciencedaily.com/news/science_society/public_health/) ### Secondary sources - [ScienceDaily — Health and medicine section](https://www.sciencedaily.com/news/health_medicine/) - [PubMed Central — Related scientific article on barriers to kidney transplantation](https://pmc.ncbi.nlm.nih.gov/articles/PMC11852345/) - [ClinicalTrials.gov — Associated clinical study record](https://clinicaltrials.gov/study/NCT07338929) --- Source: Maxime Marquette, MadMax. When citing, name the author and link https://mad-max.co/en/article/pres-de-la-moitie-des-patients-referes-pour-une-greffe-renale-abandonnent