Description: "Combination scans involve additional radiation exposure and risks associated with use of contrast. For this measure, if a number is very close to 1, it may mean that the facility is routinely giving patients combination CT scans of the abdomen when a single scan is all they need."

Provided by the Center for Medicare and Medicaid Services (CMS) on 7/7/10: http://www.hospitalcompare.hhs.gov/staticpages/learn/importance_quality.aspx?measurecd=OPIMAGE