Visceral fat on a DEXA scan: what the VAT number means
By The DexaExplained Team · Last verified
Educational body-composition information, not medical advice. Nothing here diagnoses, treats, or prevents any condition, and this site does not interpret bone-density results. Talk to your clinician about anything on a scan report that concerns you.
Of every number on a DEXA report, the visceral fat estimate — usually labeled VAT — is the one with the most health signal and the least explanation. Here's what it measures, where the thresholds people quote actually come from, and what the number can and can't tell you.
What VAT is
Visceral adipose tissue is fat stored inside the abdominal cavity, packed around the liver, intestines, and other organs — distinct from the subcutaneous fat under your skin. The distinction matters because the visceral depot is metabolically active and is the fat pattern most consistently associated with cardiometabolic risk in the research literature. Total body-fat percentage doesn't capture it: two people at 25% body fat can carry very different visceral loads, which is why the report breaks it out.
How DEXA gets the number
A DEXA scanner can't see depth directly — it images in projection. Modern software (GE Lunar's CoreScan, Hologic's visceral-fat module) estimates the visceral component in the android region by modeling the subcutaneous layer from the body outline and subtracting it. That sounds indirect, and it is — which is why it needed validation: the key study compared DEXA VAT against CT (the reference method) in 124 adults spanning BMI 18.5-40 and found agreement of r² ≈ 0.95, concluding DEXA measures abdominal VAT precisely in both sexes.
The thresholds, with their receipts
| VAT area | Common framing | Where it comes from |
|---|---|---|
| < 100 cm² | Typical | Below the elevated-risk cut-point |
| 100-160 cm² | Elevated | ≥100 cm² cut established on CT for obesity-related risk (Japan criteria, Circ J 2002) |
| > 160 cm² | High | DEXA vendor-reporting convention, not a single primary paper |
Two honest footnotes most sites skip:
- The 100 cm² threshold was derived on CT, then applied to DEXA because of the validated calibration above. That's reasonable — it's what the field does — but it's an applied threshold, not one derived on DEXA itself.
- The 160 cm² "high" line is a reporting convention. It aggregates from CT epidemiology and appears across vendor reports, but you won't find one seminal paper that owns it the way the Japan criteria own 100 cm². We label it accordingly in the interpreter.
Type your VAT number (with your body-fat %) into the interpreter and see which band it lands in, with the caveats attached.
Check my VAT number →Using the number well
- Match units before comparing. The thresholds above are areas (cm²). If your report gives grams or cm³, find the area line — the line-by-line guide shows where each vendor prints it.
- Trend beats snapshot. VAT responds well to the boring levers — the evidence-based rundown covers what actually moves it — and a falling trend across scans is a more trustworthy signal than any single reading.
- A high number is a conversation starter, not a verdict. These are population research thresholds. If your VAT sits in the elevated range, that's information worth bringing to a clinician alongside the rest of your health picture — it isn't a diagnosis, and this site won't pretend otherwise.
Waist circumference, tracked consistently, is the free between-scan proxy: it correlates with visceral fat well enough that the original 100 cm² work paired the cut-point with waist thresholds. A tape measure plus an annual scan covers most tracking needs — see how often to rescan.
Frequently asked questions
What is a good visceral fat score on a DEXA scan?
For the area measure, the widely used research threshold treats visceral fat below about 100 cm² as typical, with roughly 100-160 cm² described as elevated and above ~160 cm² conventionally labeled high on DEXA reports. These are population research thresholds derived on CT and applied to DEXA via a validated calibration — context, not a diagnosis.
Why does my report show visceral fat in grams instead of cm²?
Vendors report VAT as an area (cm²), a mass (g), and/or a volume (cm³) — three views of the same estimate. The research thresholds people quote are area-based, so use the cm² line when comparing against them; the units are not interchangeable.
Is DEXA's visceral fat estimate accurate?
It tracks CT — the reference method — closely at the population level: the validation study reported r² around 0.95 against CT in adults spanning normal weight to obese. Individual scans still carry error, so treat your VAT trend across scans as more informative than any single reading.
Can I have a normal body-fat percentage but high visceral fat?
Yes — that combination is exactly why the report breaks VAT out. Two people at the same total body-fat percentage can store it very differently, and the visceral depot is the one most associated with metabolic risk in the research literature.