11 Myths About DEXA Scans and Bone Density Testing That Leave Menopausal Women Under- or Overtreated
The number of women who've been handed a printout with a T-score on it and sent home with nothing but a calcium supplement recommendation is staggering. Bone loss during perimenopause can be rapid and silent, and the testing window matters enormously — which is exactly why these myths deserve a direct, unflinching look.
Learn more about Rose →Myth: You only need a DEXA scan after menopause is complete
Bone density loss accelerates significantly in the two to three years before the final menstrual period — often before most women or their doctors are thinking about skeletal health. Waiting until postmenopause to get a baseline scan means the steepest part of the bone loss curve may already have passed undetected. Establishing a baseline in perimenopause gives far more actionable data, especially for women with additional risk factors like low body weight, smoking history, or early ovarian insufficiency.
Myth: A 'normal' T-score means bone health isn't a concern
A T-score in the normal range (-1.0 and above) does not mean bone loss isn't happening — it means bone density is currently within a population-based range relative to a young adult reference standard. A woman can be losing bone rapidly and still sit within 'normal' if her baseline was high. Serial DEXA scans, ideally compared over time, are far more informative than any single result read in isolation.
Myth: Osteopenia always requires medication
Osteopenia — a T-score between -1.0 and -2.5 — is not a disease and does not automatically warrant pharmaceutical treatment. The absolute fracture risk for a woman with osteopenia and no other risk factors is often low enough that lifestyle interventions, resistance training, and adequate nutrition are the more proportionate response. Overprescribing bisphosphonates to low-risk women with osteopenia is a documented clinical problem, and the FRAX fracture risk tool exists precisely to contextualise T-scores within a woman's full risk profile.
Myth: T-scores are the whole story when it comes to fracture risk
T-scores measure bone mineral density, but bone strength depends on density plus bone quality — including microarchitecture, collagen integrity, and bone turnover rate — none of which a standard DEXA scan captures. The FRAX algorithm, developed by the World Health Organization, incorporates age, prior fracture history, family history, smoking, alcohol use, and secondary causes of bone loss to generate a ten-year fracture probability that is meaningfully more predictive than T-score alone. A woman with a borderline T-score and several clinical risk factors may need treatment far more urgently than her number suggests.
Myth: DEXA scans are the same regardless of where you have them done
DEXA results are machine-specific and not directly interchangeable across different manufacturers or even different machines from the same manufacturer. A woman who has her follow-up scan at a different facility than her baseline may be comparing figures that cannot meaningfully be compared, potentially leading to a false conclusion that she has gained or lost more bone than she actually has. Wherever possible, follow-up scans should be done on the same machine as the baseline, and clinicians should be asked whether the facilities use the same reference databases.
Myth: Hip and spine scores always tell the same story
DEXA typically measures bone density at both the lumbar spine and the hip, and it is not uncommon for results at these two sites to diverge significantly. Spinal scores can be artificially elevated in older women due to osteophytes, aortic calcification, or degenerative disc disease, making the spine appear denser than it truly is. Relying on the 'better' of the two numbers without clinical context can lead to false reassurance, while the hip result — which more directly predicts hip fracture risk — may be telling a very different story.
Myth: Calcium supplements are sufficient to address low bone density found on DEXA
Calcium supplementation alone has a modest effect on bone density and limited evidence for fracture prevention, particularly in women who are not calcium-deficient to begin with. Bone remodelling during and after menopause is driven substantially by oestrogen withdrawal, and addressing that hormonal context — where appropriate — tends to have a far greater impact on bone outcomes than calcium supplementation. Vitamin D status, resistance-based exercise, and protein intake are all more actionable and evidence-supported levers than calcium tablets as a standalone intervention.
Myth: HRT doesn't significantly affect DEXA results
Menopausal hormone therapy has among the strongest evidence of any intervention for preserving bone density during and after the menopause transition. Multiple large randomised controlled trials, including the Women's Health Initiative, demonstrated that oestrogen-containing HRT significantly reduces vertebral and hip fracture risk — effects that are reflected in DEXA scans taken after sustained hormone use. Women on HRT who receive a DEXA scan without the treating clinician knowing they are on hormones may have their results interpreted without this critical context, affecting treatment decisions.
Myth: Once you start a bisphosphonate, you take it indefinitely
Bisphosphonates have a residual effect in bone tissue that persists after treatment stops, which is why treatment holidays are a recognised and guideline-endorsed strategy for many women after three to five years of therapy. Continuing bisphosphonates beyond the evidence-supported window without reassessment carries real risks, including the rare but serious complications of atypical femoral fracture and osteonecrosis of the jaw. Periodic reassessment with DEXA and clinical review is the appropriate approach, not indefinite prescribing.
Myth: Thin women are the only ones who need to worry about bone density
While low body weight is a genuine risk factor for osteoporosis, it is far from the only one — and its primacy in clinical and popular thinking causes other significant risk groups to be overlooked. Women with a history of amenorrhoea, those who have used long-term corticosteroids, women with coeliac disease or inflammatory bowel conditions, and those with a family history of hip fracture are all at elevated risk regardless of body size. A woman who is a healthy weight or even overweight can have seriously compromised bone density, particularly if she has had multiple pregnancies with prolonged breastfeeding and low calcium intake.
Myth: Exercise won't move the needle on a DEXA scan result
Resistance and impact-based exercise is one of the most evidence-supported non-pharmaceutical strategies for maintaining and modestly improving bone mineral density in perimenopausal and postmenopausal women. Progressive resistance training, jumping exercises, and weight-bearing activity stimulate bone remodelling through mechanical loading, with studies showing measurable improvements in DEXA scores at the hip and spine in women who follow structured programmes. The effect size is smaller than medication for women with established osteoporosis, but for those with osteopenia or normal bone density, exercise is a primary intervention with benefits that extend well beyond bone health.
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