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📏 Relative Fat Mass (RFM)

UseWhen to use: adiposity counseling when BMI alone misclassifies.

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StrataHigher RFM approximates higher DXA %fat; sex-specific teaching bands apply.

LimitsWhen not to use: pregnancy / tense ascites distorting waist. · Pitfall: mixed units. · Not a sole anti-obesity Rx order.

SourceRelative Fat Mass (Woolcott & Bergman) anthropometric equation

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.

Methodology · worked example, guidelines & full notes
Clinical takeaway

Height/waist ratio.

When to use

When to use: adiposity counseling when BMI alone misclassifies.

How it works

RFM = 64 − 20×(height/waist) + 12×sex (female=1).

Key points

  • Height/waist ratio.
  • Sex offset +12.
  • Next: metabolic labs / waist protocol.

References

  • Relative Fat Mass (Woolcott & Bergman) anthropometric equation

Worked calculation

The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.

SexMale (0)
Height170 cm
Waist circumference90 cm

→RFM26.2%

  • Height/waist：1.889
  • Cue：Men: RFM ≥26 — higher adiposity teaching band
SexFemale (+12)
Height170 cm
Waist circumference90 cm

→RFM38.2%

  • Height/waist：1.889
  • Cue：Women: RFM ≥35 — higher adiposity teaching band
Verification & sources · governance
FAQ

Frequently asked questions

Does Relative Fat Mass (RFM) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Relative Fat Mass (RFM) calculated in practice? Can you show a worked example?
Inputs: Sex Male (0), Height 170 cm, Waist circumference 90 cm → Result: RFM 26.2 %（Height/waist: 1.889, Cue: Men: RFM ≥26 — higher adiposity teaching band） Inputs: Sex Female (+12), Height 170 cm, Waist circumference 90 cm → Result: RFM 38.2 %（Height/waist: 1.889, Cue: Women: RFM ≥35 — higher adiposity teaching band）
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