When is bone density screening necessary?

65 years aprox. Any woman c fam history and risk factors for osteoporosis below 65 y o all women above 65 yo and older postmenopausal women c hx of fractures women with med conditions associated c osteoporosis.
Multiple reasons. Post menopause early menopause use of high dose steroids for> 3 months for any reason cushings disease strong family history of osteoporosis unexplained fracture with minor trauma.