People with prediabetes and undiagnosed diabetes may already be suffering kidney damage, claims a new study.
According to the study appearing in an upcoming issue of the Clinical Journal of the American Society Nephrology (CJASN), millions of Americans may have chronic kidney disease (CKD) and not know it.
Advertisement"Our research indicates that much of the CKD burden in the United States is in persons with prediabetes and undiagnosed diabetes, who are not being screened for CKD," comments Laura C. Plantinga, ScM (University of California, San Francisco). The researchers believe that broader screening may be needed to detect patients with these two "relatively silent yet harmful diseases."
In a study funded by the Centers for Disease Control and Prevention, Plantinga and colleagues analyzed a nationally representative sample of about 8,200 Americans from the National Health and Nutrition Examination Survey. Standard laboratory tests were used to assess the rate of CKD, focusing on people with undiagnosed diabetes or prediabetes (sometimes called "borderline" diabetes).
Based on lab tests, 42 percent of subjects with undiagnosed diabetes had CKD-similar to the 40 percent rate in those with diagnosed diabetes. "Only a small percentage of participants were aware of the diagnosis of CKD," says Plantinga.
In addition, CKD was present in nearly 18 percent of subjects with prediabetes. Among participants without diabetes or prediabetes, the rate of CKD was about 11 percent.
"Based on these results, there may be a substantial number of individuals in the United States-up to 13 million-who have undiagnosed diabetes or prediabetes and who already have signs of kidney damage and/or reduced kidney function," says Plantinga. Such patients would be at high risk for worsening kidney disease and diabetes, and for the poor outcomes associated with both conditions-including cardiovascular disease and death.
Diabetes is the most important risk factor for kidney disease, but the new results suggest that harmful effects on the kidneys may be occurring even before diabetes is diagnosed. "Persons at risk for diabetes and their health care providers should be aware that earlier screening for both diabetes and kidney disease may be warranted," says Plantinga. "Earlier screening would allow for appropriate, timely medical care to prevent further progression and poor outcomes."
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