Hi there,
Missed periods and its relation to osteoporosis are only in specific situations whereby the levels of Estrogen in your body is low, eg premature menopause.
There can be several reasons why you could be experiencing amenorrhea, and the best advice for you is to seek a doctor's opinion as soon as possible to find out what the underlying cause is.
The answer to your question will depend on many other factors such as your age, medical history, medications etc.
Bone mineral density test is usually recommended for surveillence for women who have menopaused or who have premature menopause/ovarian failure as well as other risk factors for osteoporosis.
Again, do see a doctor early to find out the reason behind your amenorrhea before doing a BMD.
Regards,
Dr Michelle Chia