Review

Volume 000, Number 000, May 2025, pages 000-000

Are Your Kidneys Ok? Detect Early to Protect Kidney Health

Timely treatment is the primary strategy to protect kidney health, prevent kidney disease progression and related complications, reduce cardiovascular disease risk and prevent premature kidney-related and cardiovascular mortality [1-3]. International population assessments show low awareness and low detection of kidney disease and substantial gaps in treatment [2]. People with kidney failure universally express the preference for having been diagnosed early in their disease trajectory to allow more time for educational, lifestyle and pharmacologic interventions [4]. Therefore, increasing knowledge and implementing sustainable solutions for early detection of kidney disease to protect kidney health are public health priorities [2, 3].

Chronic kidney disease (CKD) is prevalent, affecting 10% of the world’s population, or over 700 million people [5]. Almost 80% of the population with CKD reside in low-income countries (LICs) and lower middle-income countries (LMICs), with approximately 1/3 of the known affected population living in China and India alone [5, 6]. Prevalence of CKD increased by 33% between 1990 and 2017 [5]. Increasing prevalence of CKD is driven by population growth, aging and the obesity epidemic, resulting in higher prevalence of two major risk factors for CKD: type-2 diabetes (T2DM) and hypertension. In addition, risk factors for CKD beyond cardiometabolic conditions contribute to the rising burden of kidney disease, including social deprivation, pregnancy-related acute kidney injury (AKI), preterm birth and increasing environmental threats (infections, toxins, climate change, air pollution) [5, 7]. These threats disproportionately affect people in LICs and LMICs [8].

Undetected and untreated CKD is more likely to progress to kidney failure and cause premature morbidity and mortality. Globally, more people died in 2019 of cardiovascular disease (CVD) attributed to reduced kidney function (1.7 million people) than kidney disease alone (1.4 million) [5]. CKD is expected to rise to the 5th most common cause of years of life lost by 2040, surpassing type 2 diabetes, Alzheimer’s disease and road injuries [9]. The rising mortality of kidney disease is remarkable in contrast to other non-communicable diseases (NCDs) such as CVD, stroke and respiratory disease, which are projected to experience a decline in mortality [8]. Even in early stage CKD, multi-system morbidity decreases quality of life. In particular, mild cognitive impairment is associated with early stage CKD and it is possible that early CKD detection and treatment could slow cognitive decline and reduce the risk of dementia [10]. CKD in children has profound additional effects, threatening growth and cognitive development and with lifelong health and quality of life implications [11, 12]. The number of people on kidney failure replacement therapy (KFRT) - dialysis and transplantation - is anticipated to more than double to 5.4 million from 2010 to 2030 [13, 14]. KFRT, especially hemodialysis, is unavailable or unaffordable to many in LICs and LMICs, contributing to millions of deaths annually. LICs and LMICs comprise 48% of the global population but account for only 7% of the treated kidney failure population [15].

Testing people at high-risk for kidney disease (case-finding) limits potential harms and false-positive test results compared with general population screening that should only be considered in high-income countries (HICs). Limiting testing to those at increased risk of CKD would still capture a large proportion of the global population. Moreover, targeted case-finding in patients at high risk of CKD, is not optimally performed even in HICs. About 1 in 3 people worldwide have diabetes and/or hypertension. There is a bidirectional relationship between cardiovascular disease and CKD, with each increasing the risk of the other. The American Heart Association and European Society of Cardiology call for testing those with cardiovascular disease for CKD, as part of routine cardiovascular assessments [1, 16].

Other CKD risk factors include family history of kidney disease (e.g. APOL1-mediated kidney disease common in people of West African ancestry), prior AKI, pregnancy-related kidney disease (e.g. pre-eclampsia), malignancy, autoimmune disorders (systemic lupus erythematosus, vasculitis), individuals born with low birth weight or pre-term, obstructive uropathy, recurrent kidney stones, and congenital anomalies of the kidney and urinary tract (CAKUT) (Fig. 1) [3]. The social determinants of health strongly affect CKD risk, both for individuals and at a country level. In LICs and LMICs, heat stress for agricultural workers is thought to cause CKD of unknown etiology, an increasingly recognized major global cause of CKD [17]. In addition, envenomations, environmental toxins, traditional medicines and infections (viral hepatitis B or C, HIV, and parasites) deserve consideration as risk groups, especially in endemic areas [18, 19].

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Figure 1. Risk factors for chronic kidney disease (CKD).

Conceptually, there are three levels of CKD prevention. Primary prevention reduces the incidence of CKD by treating risk factors; secondary prevention reduces progression and complications in those with detected CKD; and, tertiary prevention improves outcomes in those with kidney failure by improving management, such as improved vaccination or optimal dialysis delivery [20]. Primary and secondary prevention strategies can utilize the eight golden rules for kidney health promotion; healthy diet, adequate hydration, physical activity, blood pressure monitoring and control, glycemic monitoring and control, avoidance of nicotine, avoidance of regular use of non-steroidal anti-inflammatory drugs and targeted testing for those with risk factors [21]. Five of these are identical to “Life’s Essential 8” rules for improving and maintaining cardiovascular health which also include healthy weight, adequate sleep and lipid management [22]. Early detection focuses on secondary CKD prevention that involves protecting kidney health and reducing cardiovascular risk.

Globally, early detection of CKD is rare, haphazard and even less likely to occur in LICs or LMICs. Currently, only three countries have a national program to actively test for CKD in at-risk populations and a further 17 countries actively test at-risk population during routine health encounters [23]. Even in HICs, albuminuria is not assessed in over half of people with T2DM and/or hypertension [24-26]. Startlingly, in those with documented reduced kidney function, a diagnosis of CKD is often missing. A study in HICs showed absence of CKD diagnosis among 62-96% of the population with laboratory evidence of CKD stage G3 [27].

We recommend that healthcare professionals perform the following tests for all risk groups to assess kidney health (Fig. 2):

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Figure 2. Conceptual framework of a chronic kidney disease (CKD) testing, risk stratification, and treatment program [30].

1. Blood pressure measurements as hypertension is the most prevalent risk factor for kidney disease worldwide [3, 28, 29].
2. Body mass index (BMI) since obesity is epidemiologically associated with CKD risk indirectly through T2DM and hypertension and as an independent risk factor. Visceral adiposity contributes to monocyte microinflammation and cardiometabolic kidney risk [3, 28, 29].
3. Testing for diabetes with glycosylated hemoglobin or fasting blood sugar or random glucose is part of kidney health assessment as T2DM is a common risk factor [3, 28, 29].
4. Evaluating kidney function by using serum creatinine to estimate GFR (eGFR), is recommended in all settings [3]. GFR should be estimated with a validated, race-free equation appropriate for the country or region and age group [3]. In general, the eGFR < 60 mL/min/1.73 m² is the threshold for CKD in adults and children, although a threshold of < 90 mL/min/1.73 m² can be flagged as “low” in children and adolescents over the age of 2 years [3]. A limitation of creatinine-based eGFR is that creatinine is also a marker of nutrition and muscle mass. Therefore, states of malnutrition and frailty overestimate kidney function [3, 30]. Thus, eGFR using the combination of serum creatinine and cystatin C is generally more accurate than either biomarker alone in most clinical contexts. However, the feasibility of cystatin C use is mainly limited to HICs because of assay availability and cost relative to creatinine [3, 30, 31].
5. Testing for kidney damage (albuminuria). In adults and children, a first morning sample is preferred for assessing albuminuria [3]. In adults, quantitative urinary albumin-creatinine ratio (uACR) is preferred as the most sensitive test [3]. Importantly, urinary albumin is in the process of being standardized analytically, which should ultimately facilitate worldwide uACR standardization [32]. In children, both protein-creatinine ratio (uPCR) and uACR should be tested in order to assess tubular proteinuria [3]. Semiquantitative albuminuria testing allows for flexibility for point of care or home-based testing [33]. Semiquantitative or qualitative screening tests should be positive in > 85% of individuals with quantitative uACR 30 mg/g or more to be useful [34]. In resource-constrained settings, urine protein dipstick testing may be used with a threshold of +2 proteinuria or greater to reduce false positive results for repeat confirmatory testing [35].

In specific populations, the following can be considered:

6. Testing for hematuria is notable as the forgotten risk factor in recent clinical practice guidelines. It is particularly important for those at risk for glomerular disease, particularly IgA nephropathy [36].
7. Baseline imaging in groups with signs or symptoms of structural abnormalities (e.g. pain and hematuria) to evaluate for kidney masses, cysts, stones, hydronephrosis or urinary retention is important. Antenatal ultrasound can detect hydronephrosis and other CAKUT.
8. With increasing availability of genetic testing, family cascade CKD testing is indicated when there is a known genetic risk of kidney disease [37].
9. In those who have an occupational risk of developing kidney disease, kidney testing should be offered as part of occupational health programs.
10. Those who donate kidneys should be included in a post-donation surveillance program to assess kidney health over the long-term [38].

Screening for CKD fits with many of the World Health Organization’s Wilson-Jungner principles. Early stage CKD is asymptomatic and effective treatments, including lifestyle modification, interdisciplinary care and pharmacologic interventions are established [2, 3, 30, 35]. WHO essential medicines that improve CKD outcomes should be widely available, including ACE inhibitors, angiotensin receptor blockers, statins and sodium glucose co-transporter-2 inhibitors (SGLT2i) [2, 39]. SGLT2i alone are estimated to decrease the risk of CKD progression by 37% in people with and without diabetes [40]. For a 50-year-old person with albuminuria and non-diabetic CKD, this could extend their future period of healthy kidney function from 9.6 to 17 years [41]. These essential medicines reduce progression to more advanced CKD stages and limit cardiovascular hospitalization to provide short-term cost-effectiveness, especially for LICs. Where available and affordable the range of new paradigm-shifting medications to slow CKD progression also includes glucagon-like peptide-1 receptor antagonists, non-steroidal mineralocorticoid receptor antagonists, endothelin receptor antagonists and specific disease-modifying drugs (e.g. complement-inhibitors) that herald an exciting new era for nephrology.

Considering the significant healthcare costs associated with CKD, particularly hospitalization and kidney failure, effective preventive measures offer clear economic benefits for both high- and low-income countries. CKD confers enormous costs to the individual, their families, healthcare systems and governments worldwide. In the United States, CKD costs Medicare over US$ 85 billion annually [13]. In many high- and middle-income countries, 2-4% of the health budget is spent on kidney failure care alone. In Europe, healthcare costs associated with CKD are higher than those associated with cancer or diabetes [42]. Reducing the burden of kidney care worldwide will also have profound environmental effects, as it will save water and plastic waste, especially associated with dialysis [43]. On an individual level, CKD costs are frequently catastrophic, particularly in LICs and LMICs, where the individual largely bears the burden of payment. Only 13% of LICs and 19% of LMICs cover the costs of KFRT for adults [15]. CKD causes 188 million people in low and lower-middle-income countries annually to be faced with catastrophic healthcare expenditures [44].

The most widely cited and studied incremental cost effectiveness ratio (ICER) threshold to assess screening is US$ < 50,000 per quality-adjusted life year (QALY) [45]. If the prevalence of CKD is high, a population-wide screening strategy should be considered in HIC [33, 46]. For example, in the United States, a recent Markov simulation model of population-wide screening for CKD, which included appropriate SGLT2i treatment added to standard of care ACE inhibitors or angiotensin receptor blockers for adults age 35 to 75 years old with albuminuria, concluded that screening to identify CKD would be cost-effective [46]. In addition, an analysis of a home-based general population semiquantitative albuminuria screening in Holland was also found to be cost effective [33]. Case finding to detect CKD in higher risk groups rather than mass or general population screening will reduce costs and other harms whilst increasing the true positive rate of the screening tests [3, 35, 45]. An alternate ICER threshold proposed by WHO is < 1-3 times the ratio of the gross domestic product per capita income per QALY can be used to assess case finding approaches in LIC and LMIC [45]. The recommended tests for detecting kidney disease are low-cost and minimally invasive, facilitating their administration across diverse settings. Basic testing of eGFR and urinary ACR are widely available and using urine dipstick testing where quantitative proteinuria testing is unavailable or unaffordable will drastically reduce testing costs [31].

If coupled with effective intervention, early identification of people with kidney disease will benefit the individual, the health care system, governments and the economy [44]. Health and quality of life benefits for the individual would lead to improved productivity, especially in the young with more working years ahead, and to developmental/educational improvements in children and young adults. Individuals would face less catastrophic health expenses, governments and healthcare systems will save money not only on CKD care, but also on cardiovascular disease costs, and economies will benefit from more worker participation. This is especially crucial for lower-income countries, where the greatest burden of CKD exists and is cruelly coupled with the lowest ability for governments and individuals to afford kidney care.

Structural barriers to widespread identification and treatment of people with CKD include cost, reliability of testing and lack of health information systems to track CKD burden. These are underpinned by a lack of relevant government and healthcare policy, low healthcare professional knowledge and implementation, poor general population perceived kidney disease risk and low patient CKD awareness. Solutions for implementing effective interventions include tying CKD identification to existing screening programs, educating the public and primary care professionals and leveraging non-governmental organization (NGO) joint advocacy programs to focus health policy agendas on kidney disease. Any solutions must balance the potential benefits and harms of screening and case-finding programs. Ethical implications for consideration include the availability of resources (such as health care workers and medicines), the affordability of testing and treatment, false positives or negatives and anxiety for patients and their families [47].

Screening and case-finding programs require workforce capacity, health information systems, reliable testing equipment and equitable access to medical care, medicines, vaccines and medical technologies. Primary care is at the front lines of the battle to protect kidney health, particularly in low and lower middle-income countries. The tiny nephrology workforce, with a median global prevalence of 11.8 nephrologists per million population and an 80-fold difference between LICs and HICs, is inadequate to detect and manage the vast majority of CKD [23]. As for other chronic diseases, primary care clinicians and other frontline health workers are foundational to early detection of CKD [48]. Testing must be affordable, simple and practical, with point-of-care creatinine testing and urine dipsticks useful in resource-limited settings [31]. Educational efforts directed at primary care clinicians are key to integrating CKD detection into routine care, despite constrained time and resources [49-51]. Automated clinical decision support could leverage electronic health records to identify people with CKD or at high-risk of CKD and recommend appropriate actions to clinicians (Fig. 2).

Currently, few countries have CKD registries, limiting our ability to highlight the disease burden to governments. Knowledge of CKD burden assists in prioritizing kidney health needs, which should then progressively expand to encompass the full spectrum of kidney care [52]. A global survey revealed only a quarter of the countries (41/162) had a nation specific CKD strategy and fewer than a third (48/162) recognized CKD as a public health priority [23]. WHO’s recognition of CKD as a major driver of NCD mortality would be impactful in increasing awareness, improving local surveillance and monitoring to implement clinical practice guidelines and improving resource allocation [2].

Programs for the early detection of CKD will require extensive coordination and engagement of stakeholders, including governments, health systems and insurers. International and national kidney organizations, such as the International Society of Nephrology (ISN), already advocate to the WHO and individual governments for the prioritization of kidney disease. We must continue this work, collaborating to streamline early detection program planning and implementation. Connection to existing community interventions (e.g. cardiovascular disease prevention) in LMICs and HICs can decrease cost and maximize efficiencies by integrating into existing programs. Such programs will need to be adapted to the local context and can be held in a variety of settings, such as individual healthcare practices, hospitals, as well as regional or national healthcare facilities or as outreaches in rural communities. Depending on local regulations and resources, screening and case-finding can also take place outside of medical settings such as town halls, churches or markets. Volunteers in the community can also assist with community-based screening and case-finding efforts.

In conjunction with reorienting the clinical practice of health care professionals to a greater focus on timely detection of CKD, we must focus on general population perceived risk education and health promotion activities, as well as education programs aimed at patient awareness and empowerment. General population awareness of kidney disease is poor, with 9 out of 10 people with CKD unaware they are affected [53]. Coverage of kidney disease is missing from the mainstream conversation, with an analysis of lay press showing kidney disease was 11-times under-represented in discussed compared to the actual cause of death [54]. A number of national and international organizations have developed public-facing quizzes on risk of kidney disease, supported by a regional study that showed socially vulnerable patients with hypertension do not understand their kidney risks [21, 55-57]. Online and direct education for healthcare professionals can improve consumer health literacy. Patient activation, engagement, and shared decision-making are downstream impacts of awareness. Awareness education is nuanced for CKD, including detection and risk stratification to inform and empower rather than frighten regarding the timing and extent of interventions (Supplementary Material 1, wjnu.elmerpub.com) [4, 27, 57]. Getting the balance right will optimize self-efficacy and patient, family and caregiver engagement.

We call on all healthcare professionals to check the kidney health of their patients at risk of kidney disease. In tandem, we must work with public health organizations to improve the general population’s perceived risk of kidney disease and empower people at risk to seek kidney health checks. To ensure this change can be delivered, we must work with healthcare systems, governments and the WHO to prioritize kidney disease and create effective and efficient early detection programs for kidney disease. Only then will the paradigm-shifting benefits of lifestyle change and pharmacologic treatments translate to better kidney and overall health for people all around the world.

Suppl 1. Person perspectives on CKD awareness, detection and treatment from the literature.

Acknowledgments

We thank Valerie A. Luyckx, Marcello Tonelli, Ifeoma Ulasi, Vivekanand Jha, Marina Wainstein, Siddiq Anwar, Daniel O’Hara, Elliot K. Tannor, Jorge Cerda, Elena Cervantes, and Maria Carlota Gonzalez Bedat for their invaluable feedback on this paper.

Financial Disclosure

None to declare.

Conflict of Interest

All the authors declared no competing interests.

Author Contributions

All authors contributed to the writing and the revision of this paper.

Data Availability

The authors declare that data supporting the findings of this study are available within the article supplementary files.

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