The short explanation
There is no single rule for everyone, but many doctors repeat a bone density (DEXA) scan every two years or so for people on osteoporosis treatment. Some repeat it sooner if there are concerns, and others wait longer if the earlier scans were stable. The repeat scan helps show whether bone density is staying steady or improving, which suggests the treatment is helping. A stable result is often a good outcome, since the main aim of treatment is to prevent fractures rather than to make the numbers rise a lot.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- For best comparison, repeat scans should ideally be done on the same machine or at least in the same centre, since results can vary between machines.
- After some years of certain osteoporosis treatments, doctors review whether to continue, pause or change the medicine. Her scan results, any fractures and her overall risk help guide that decision, so the three-year mark is a good time to ask.
- Taking treatment regularly as advised, getting enough calcium and vitamin D, staying active and preventing falls all affect how well it works. If she has had trouble taking the medicine, tell the doctor rather than stopping it.
- Fall prevention at home, such as good lighting, removing loose mats and a grab bar in the bathroom, matters as much as the scan.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot say when her next scan should be or whether her treatment is working. That depends on her results and her doctor's judgement.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- When should she have her next bone density scan?
- Is her current treatment working, based on her scans?
- Should her treatment continue, pause or change after three years?
- Should her vitamin D and calcium levels be checked?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Emergency — call 112 now
- Call 112 or go to the nearest emergency department if she falls and cannot stand or has severe hip pain.
Get help the same day
- Get care the same day if she has new back pain after a minor strain or fall.
Raise it at a routine appointment
- Book a routine follow-up to review her treatment and plan the next scan.
Sources
The evidence this explanation is built on.
- Bone density MedlinePlus (US National Library of Medicine)
- Osteoporosis MedlinePlus (US National Library of Medicine)
- Osteoporosis NHS
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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