Chicago ? No news isn’t necessarily good news for patients waiting for the results of medical tests. The first study of its kind finds doctors failed to inform patients of abnormal cancer screenings and other test results 1 out of 14 times.

The failure rate was higher at some doctors’ offices, as high as 26 percent at one office. Few medical practices had explicit methods for how to tell patients, leaving each doctor to come up with a system. In some offices, patients were told if they didn’t hear anything, they could assume their test results were normal.

The findings were published in Monday’s Archives of Internal Medicine.

Practices with electronic medical records systems did worse or no better than those with paper systems in the study of more than 5,000 patients.

Dr. Harvey Murff, a patient safety researcher at Vanderbilt University Medical Center who wasn’t involved in the study, said the researchers gave doctors “the benefit of the doubt” and still found a significant problem.

The researchers chose tests findings in which any doctor would agree patients should be informed. And they gave doctors a chance to explain when they found nothing in medical charts showing patients had been notified of bad test results.

The tests included cholesterol blood work, mammograms, Pap smears and screening tests for colon cancer.

Failing to inform patients can lead to malpractice lawsuits and increased medical costs, the researchers said.