How Often Should You Have a Bone Density Scan? A UK Timing Guide

How often should you have a bone density scan?

For most people, a repeat bone density (DXA) scan is done no sooner than about every two years — and often less frequently than that. The Royal Osteoporosis Society states that patients will normally have a scan every two to five years, because bone density changes very slowly over time, and scans done too close together will not show any real change Royal Osteoporosis Society, 2026.

There is no single "right" interval that applies to everyone. The correct answer depends on two things: your baseline result (how strong or fragile your bones already are) and your fracture risk (your age, medical history, medications and other risk factors). Those two factors decide whether you sit at the frequent-monitoring end of the range or the very-occasional end — which is why the timing should be set with your doctor rather than by a fixed calendar rule.

Why can't you have a DXA scan every year?

Because a genuine change in bone density has to exceed the scanner's own test-to-test variation before it can be believed — and bone rarely changes that fast in a year. Every scanner has a small amount of measurement "noise": scan the same person twice and you won't get identical numbers. The size of change that clears this noise is called the least significant change, and only differences bigger than it can be treated as real rather than measurement error.

American Family Physician concluded that repeating DXA in less than two years is unlikely to be clinically useful, and warned that early re-tests can actively mislead through regression to the mean — where an unusually low or high first reading naturally drifts back towards average on the second scan, faking a "change" that never really happened American Family Physician, 2010. The Royal Osteoporosis Society makes the same point in plainer terms: bone density changes very slowly over time, so scans done too close together are unlikely to show a meaningful difference Royal Osteoporosis Society, 2025.

What do the guidelines say about repeat scan timing?

The specialist position is that repeat intervals must be individualised — there is no universal number. The International Society for Clinical Densitometry (ISCD) requires every scanning facility to calculate its own precision and least significant change rather than rely on the manufacturer's figure, and says repeat-testing intervals should be tailored to age, baseline bone density, treatment type and risk factors — with shorter intervals where rapid bone change is likely International Society for Clinical Densitometry (ISCD), 2023.

To give a sense of scale, the ISCD's minimum-precision least significant change figures are in the region of 5.3% at the lumbar spine, 5.0% at the total hip and 6.9% at the femoral neck International Society for Clinical Densitometry (ISCD), 2023. These are illustrative and facility-dependent, not a fixed threshold for your particular scan — but they show why a change has to be reasonably large before it counts. A percentage-point wobble over twelve months is exactly the kind of difference that can hide inside that margin. (If you want to understand what the numbers on your report actually mean, see our guide to DXA scan results and your T-score.)

Do you need scans more often on osteoporosis treatment or at high risk?

Often, yes — treated and higher-risk people are the group most likely to be re-scanned every one to two years. A 2025 review in Current Rheumatology Reports notes that repeat assessment every one to two years is recommended for people at moderate, high and very high fracture risk, and that an even shorter interval should be considered for those losing bone quickly — for example on glucocorticoids (steroids), aromatase inhibitors used in breast-cancer treatment, or androgen-deprivation therapy for prostate cancer Current Rheumatology Reports, 2025.

The logic is simply that faster bone change clears the least-significant-change threshold sooner, so a follow-up scan has something real to detect. The Royal Osteoporosis Society adds a practical caveat in the other direction: sometimes a repeat scan is not needed at all, where there are already clear signs — such as previous spinal fractures — that treatment should continue regardless of the number Royal Osteoporosis Society, 2025.

Your first scan was normal — how long until the next?

If you're low-risk and not on treatment, the next scan is usually a long way off. The Current Rheumatology Reports review notes that in stable, older, community-dwelling people, bone density stays fairly steady, so a repeat DXA within about three to seven years may add little value Current Rheumatology Reports, 2025. The US Preventive Services Task Force goes further, citing cohort data suggesting that repeating bone-density testing at four-to-eight-year intervals does not improve the prediction of who will fracture — while also acknowledging that the evidence on the single best screening interval remains limited US Preventive Services Task Force, 2025.

The important exception is a change in circumstances. If you start a medication that affects bone, go through menopause, break a bone, or develop a new risk factor, that can reset the clock and justify an earlier re-scan than your last normal result would otherwise imply.

Should you have an early baseline scan in your 40s or 50s?

A first "baseline" scan is not about diagnosing a problem — it's about creating a personal reference point to measure future change against. Formal screening guidelines are targeted at older and higher-risk groups: the US Preventive Services Task Force, for example, recommends screening women aged 65 and over, plus younger post-menopausal women at increased risk US Preventive Services Task Force, 2025. No guideline recommends routinely scanning every healthy adult in their 40s, and this article does not claim otherwise.

What an earlier baseline does offer is context. Every follow-up scan is only as useful as the reading it is compared against — and if your first-ever scan happens after bone loss is already advanced, you have no personal history to show how fast, or whether, things are changing. A baseline gives future scans something meaningful to be measured against. That is a proactive, personal-tracking rationale, distinct from any clinical screening recommendation — and a decision worth discussing with a professional rather than acting on alone. Our bone health assessment is built around exactly this idea of establishing a clear starting point.

Does a radiation-free REMS scan let you be re-measured more often?

A radiation-free scan removes the radiation-exposure limit on repeat measurement — but it does not change how slowly bone actually remodels. A 2025 review in Cureus describes REMS (Radiofrequency Echographic Multi Spectrometry) as a non-ionising, ultrasound-based alternative whose radiation-free nature allows for more frequent assessments, reports excellent measurement precision, and notes advantages in situations where radiation is a particular concern, such as pregnancy or paediatric use Cureus, 2025.

The nuance matters. "More frequent assessments become possible" is a statement about safety and access, not a clinical instruction to scan more often. If you take a repeat measurement before bone has had time to change by more than the least significant change, you still won't see a meaningful difference — whichever technology you use. Where radiation-free measurement genuinely helps is in making an early baseline and well-timed follow-ups easier and safer to obtain, without a cumulative radiation budget to weigh up. For a fuller comparison of the two methods, see REMS vs DEXA, or book a radiation-free bone health assessment to establish your own baseline.

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This article is part of our screening technology series. To understand the numbers on your report, read our guide to DXA scan results and your T-score.