Bone density scans. Evidence to support widespread use not strong--yet.
Meyer
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CR
D000368:Aged; D015519:Bone Density / Q000502:physiology*; D003362:Cost-Benefit Analysis; D005260:Female; D006801:Humans; D008403:Mass Screening / Q000191:economics; D008875:Middle Aged; D008910:Minnesota; D015663:Osteoporosis, Postmenopausal / Q000191:economics / Q000517:prevention & control*; D012680:Sensitivity and Specificity