New guidelines suggesting that all children be screened for high cholesterol, depression and HIV are based on research showing rising numbers of kids with those problems, explains Upstate pediatrician Beth Nelsen, MD. Ages vary for the screenings -- from 9 to 11 for cholesterol, and from 16 to 19 for HIV – which are updated  annually by the American Academy of Pediatrics. Many tests, including for anemia and heart failure, have already been added by pediatricians during checkups, Nelsen said.