REMS Scan Explained: What It Is, Cost and Where to Get One

What is a REMS scan?

A REMS scan — Radiofrequency Echographic Multi Spectrometry — is a non-ionising, radiation-free ultrasound scan of the lumbar spine and the top of the thigh bone (the proximal femur, at the hip). Unlike a conventional ultrasound image, REMS keeps the raw, unfiltered "radiofrequency" signals that bounce back from bone and analyses them directly. Diagnostics (Basel), 2023

Those raw signals are compared against reference spectral models — matched to your sex, age, the site being scanned and your BMI — to estimate bone mineral density and produce a T-score and Z-score, the same scores you would recognise from a bone density report. Diagnostics (Basel), 2023 A 2025 systematic review describes REMS as a portable, radiation-free tool that yields BMD, T-scores, Z-scores and an additional Fragility Score. Diagnostics (Basel), 2025

The extra ingredient is that Fragility Score (FS) — a parameter that reflects bone quality and microarchitecture independently of density. Diagnostics (Basel), 2023 More on what it means below.

How is a REMS scan different from a DEXA scan?

The headline difference is radiation: a DEXA (DXA) scan uses a very low dose of X-rays, while a REMS scan uses ultrasound and involves none. DEXA is the standard scan the NHS uses to diagnose osteoporosis; its radiation dose is very small — roughly equivalent to about three days of ordinary background exposure — and a T-score of −2.5 or below indicates osteoporosis. Royal Osteoporosis Society, 2024

Because REMS uses no ionising radiation and the equipment is portable, it can be brought to non-clinical venues and, in principle, repeated more freely. Reviews note it has been studied for radiation-sensitive groups and even bedside use. Diagnostics (Basel), 2025

There is one more practical difference. In people whose spines are affected by osteoarthritis or other changes, a lumbar DEXA reading can be pushed falsely high by those artefacts. In one osteoarthritis/vertebral-fracture population, REMS classified 35.1% of patients as osteoporotic against just 9.3% by DXA — a gap the review attributes to DXA being confounded, rather than to REMS being generally "better". Diagnostics (Basel), 2025 For a fuller side-by-side, see our REMS vs DEXA scan comparison.

What does the research show about how well REMS agrees with DEXA?

Studies generally report strong agreement between REMS and DEXA at the spine and hip — though the figures are context-dependent and vary between populations. An early large Italian study found diagnostic concordance with DXA of around 88.8% at the lumbar spine and 88.2% at the femoral neck, with a wider European multicentre study reporting about 86%. Diagnostics (Basel), 2023

Correlations tend to be high: reviews report REMS-versus-DXA correlation coefficients frequently above 0.90 for BMD and T-scores at the lumbar spine and femoral neck, with sensitivity and specificity often exceeding 90%. Cureus, 2025 Agreement also holds up when the two methods are used to triage fracture risk: in one study, 92% of patients received concordant NOGG classifications for major osteoporotic fracture risk from REMS and DXA, and 87% for hip fracture risk, with no statistically significant difference in FRAX-based assessment between the two. Archives of Endocrinology and Metabolism, 2025

On reproducibility, the 2025 review reports a REMS precision (RMS-CV) of about 0.38% at the lumbar spine, set against a DXA literature average of roughly 2.02% — a favourable comparison, though it is drawn from the review's own reporting rather than a single head-to-head trial. Diagnostics (Basel), 2025

What is the Fragility Score, and why does it matter?

The Fragility Score is REMS's measure of bone quality — the percentage of scanned bone segments whose ultrasound signals more closely resemble a "fractured" bone model than a "non-fractured" one. It gives a fracture-risk estimate that is independent of bone mineral density, which matters because two people with the same T-score can have very differently structured bone. Aging Clinical and Experimental Research, 2023

In a 5-year prospective study of 1,989 people, the Fragility Score predicted incident fragility fractures and outperformed both REMS and DXA T-scores — for example, an AUC of around 0.81 for the lumbar spine in women, versus 0.71 for the REMS T-score and 0.68 for the DXA T-score. Aging Clinical and Experimental Research, 2023 A separate review likewise found the Fragility Score had a superior ability to predict incident osteoporotic fractures compared with either REMS or DXA T-scores. Cureus, 2025

In short, density tells you how much bone you have; the Fragility Score is an attempt to describe how strong it is.

Is a REMS scan recommended for diagnosing osteoporosis in the UK?

No — not for diagnosis. The UK's National Osteoporosis Guideline Group (NOGG 2024) is unambiguous: "The use of quantitative ultrasound, IBEX bone health, and Radiofrequency Echographic Multi Spectrometry are not recommended for the diagnosis of osteoporosis (Strong recommendation)." National Osteoporosis Guideline Group (NOGG), 2024 NOGG also notes that non-absorptiometric techniques, including quantitative ultrasound, have been less well validated than DXA. National Osteoporosis Guideline Group (NOGG), 2024

In practice that means a formal diagnosis of osteoporosis in the UK is made by a doctor, usually using DXA, where a T-score of −2.5 or below is the diagnostic threshold. Royal Osteoporosis Society, 2024

Screen My Bones offers REMS as a radiation-free way to check on your bone health outside that formal diagnostic pathway — a screening and monitoring option, not a diagnosis. That positioning is our own; it is not a guideline endorsement of REMS. If a scan flags a concern, the right next step is a conversation with your GP, who can arrange DXA where appropriate.

Who is a REMS scan best suited to?

REMS tends to suit people who want a radiation-free snapshot of their bone health, or who need repeated checks over time. Because there is no ionising radiation, reviews highlight its study in radiation-sensitive groups and its portability for use outside a hospital setting. Diagnostics (Basel), 2025 That makes it a practical fit for:

• People who want a proactive baseline rather than waiting for symptoms.
• Anyone monitoring change over time — for example alongside menopause or a period of weight loss — where repeat scans are useful.
• People whose lumbar DEXA may be distorted by osteoarthritis or spinal changes, where an ultrasound-based reading can add context. Diagnostics (Basel), 2025

It is less suited to anyone who specifically needs a formal osteoporosis diagnosis or is already in a treatment pathway — that remains DEXA territory. You can read more about what's involved on our bone health assessment and REMS bone density scan pages.

Where can you get a REMS scan in the UK, and what does it cost?

Screen My Bones runs REMS scans at mobile "assessment day" pop-up events across the UK, rather than from a single fixed clinic. REMS is generally offered privately rather than as an NHS diagnostic test, and prices vary by provider and venue — so the most reliable way to see current availability and cost is the booking page itself.

You can check upcoming assessment days and book a slot to find the nearest date and location. Bring any previous bone scan results if you have them, so your report can be read in context.

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This article is part of our screening technology series. For a direct head-to-head, see our REMS vs DEXA scan comparison.