10:06am Saturday 19 October 2019

Definition of acute kidney injury may misclassify patients

By Ziba Kashef

Dr. F. Perry Wilson

Their research, published in the Clinical Journal of the American Society of Nephrology, confirms the limitations of the consensus definition for a condition that affects hundreds of thousands of patients in the United States each year.

Currently, acute kidney injury is diagnosed when the serum creatinine concentration, which measures levels of a metabolism byproduct in the blood, rises. Small increases in SCr may indicate acute kidney injury — a sudden loss of kidney function — that requires early treatment, according to internationally accepted criteria. But, the researchers note, variations in the quality and frequency of lab tests can contribute to false-positive results and misdiagnosis of kidney disease.  

To assess the false-positive rate for acute kidney injury, assistant professor of nephrology Dr. F. Perry Wilson and his co-authors used clinical data from more than 2,000 patients to simulate SCr testing. Accounting for variations in labs and biology, they determined the proportion of patients who would be erroneously diagnosed. “The basic finding is that overall the false-positive rate is 8%, and in those patients with chronic kidney disease, the false-positive rate is 30.5%,” said Wilson.


The likelihood of false-positive acute kidney injury diagnoses increases with more frequent measurement, and when the true creatinine is higher.

 Contact Ziba Kashef ziba.kashef@yale.edu 203-436-9317

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