Subtle Kidney Function Abnormalities May Signal Future Chronic Disease, New Study Finds
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A groundbreaking study reveals that even seemingly normal variations in kidney function can serve as early warning signs for chronic kidney disease, offering a pathway to preventative care through a newly developed web tool. Chronic kidney disease affects 10% to 15% of adults globally and is projected to be among the top five causes of years of life lost by 2040.
The Challenge of Late Diagnosis
For years, a major obstacle in combating chronic kidney disease has been late diagnosis. Until now, patients often receive a diagnosis only after significant kidney function – more than half – has already been lost. This delay severely limits treatment options and worsens patient outcomes.
A New Approach Inspired by Pediatrics
Researchers at the Karolinska Institute in Sweden have pioneered a new method for identifying individuals at risk. They constructed population distributions for the estimated glomerular filtration rate (eGFR), the standard measure of kidney function. This approach, as explained by a postdoctoral researcher at the Karolinska Institutet, is “inspired by growth and weight charts which are used in pediatrics, and which help doctors identify children at risk of obesity or insufficient growth.”
The team has made these eGFR distribution graphs available to healthcare professionals, alongside a web-based calculator developed by a PhD student, designed to compare a patient’s eGFR to population norms based on age and sex.
Massive Data Set Reveals Key Insights
The study, part of the larger SCREAM project, analyzed data from over 1.1 million adults in the Stockholm region of Sweden – representing approximately 80% of the population between 40 and 100 years old. Researchers examined nearly seven million eGFR tests performed between 2006 and 2021 to create age- and sex-specific distributions.
The analysis revealed a strong correlation between deviations from median eGFR and adverse health outcomes. Individuals with an eGFR falling below the 25th percentile for their age and sex demonstrated a significantly increased risk of developing kidney failure requiring dialysis or transplant. Furthermore, mortality rates exhibited a U-shaped relationship with eGFR percentiles, indicating that both extremely low and high values were associated with a higher risk of death.
A Call for Increased Awareness
Despite these advancements, the study highlights a critical gap in current healthcare practices. Researchers found that only about 25% of individuals with an eGFR below the 25th percentile underwent further testing for urinary albumin, a crucial indicator of early kidney damage. This suggests a significant lack of awareness among healthcare providers regarding the importance of proactive kidney health monitoring.
This research was supported by funding from the Swedish Research Council, the Swedish Cardiology and Lung Foundation, the Stockholm Region, and the Swedish Kidney Foundation, among others.
