Nov 20, 2013 — By a standard test most African-Americans have low levels of vitamin D. But most African-Americans also have strong bones. It turns out that the problem is with the test, which was looking for a form of D more common in Caucasians. The variation is a result of human evolution.
Oct 28, 2013 — The medical screening tests offered by churches and other nonprofits may sound like a great idea. But some of the tests, which are performed by for-profit companies, are not recommended by national organizations because they can lead to invasive testing and unnecessary treatment.
Sep 25, 2013 — Many older women get bone scans every two years to look for signs of osteoporosis. But for the vast majority of people, the repeat scans don't detect significant changes. New research suggests it may make sense to stop or slow down on the scans after people have had an initial test.
Jul 8, 2013 — There are tests for heart attacks and diabetes, but few for brain disorders. Researchers are trying to change that, but are finding the hunt for biomarkers for mental illness to be a tough slog. Tests on the market, like ones for Alzheimer's, are not conclusive.
Apr 25, 2013 — Problems at a Canadian factory have caused a shortage of tuberculosis tests in the U.S. Some hospitals and health departments around the country are deferring routing TB testing as a result.