At what age (or is it more based on bodyweight, family history, or ???) is it recommended to start being screened for bone density? I'm 45 and slender, but I still menstruate regularly. I also run (not long distances -- 2 miles or so at a time) on the treadmill and trails a couple of times a week, mountain bike (irregularly lately), do long hikes on weekends, and lift weights a couple of times a week (nothing too intense and more upper body than low). My primary-care doc hasn't mentioned bone screening yet, and I didn't think to ask at my last yearly physical (August). Is this something I should have done fairly soon -- or not until I reach menopause or age 50 or ???

Thanks!!
Emily

P.S. Only broken bone I've ever had was pelvic fractures from a road cycling accident in April 2005. I hit the pavement at a pretty high speed right on my ilium, though, and no mention was ever made by my orthopedic surgeon that my bone density may have had anything to do with causing the fractures.