Dr. Maya Haasz, an assistant professor at the University of Colorado School of Medicine, said that for the past few years, every child over age 10 who comes to the emergency room at Children’s Hospital Colorado, where she is an attending physician, is screened for suicide risk, using a questionnaire. “Somewhere between 5 and 10 percent of our patients presenting for nonmental health concerns screen positive,” she said — and this was true before the pandemic.