Joscelyn Benninghoff, 10, goes over the results of her cholesterol test with her mother Elizabeth Duruz (right) and Dr. Elaine Urbina at Cincinnati Children's Hospital in 2011. Al Behrman/AP hide caption

Mammograms are a key screening tool for breast cancer. But critics say they're not good enough. Salih Dastan/iStockphoto hide caption

Some of the money spent on annual mammograms might do more good if it went toward risk-based screening, a doctor says. iStockphoto hide caption

Insurers still charge copays for some contraceptives. Laura Garca/iStockphoto hide caption

Stacy Riggs of Fairfax, Va., is prepped for a screening for atrial fibrillation by Life Line Screening medical assistant Kennea Blake at Messiah United Methodist Church in Springfield, Va. Jenny Gold/Kaiser Health News hide caption

Some images of lung cancer are clear cut. But in many others, a nodule on the screen turns out not to be cancer at all. iStockphoto.com hide caption