What does Styku measure, and what data do clients receive after a scan?

A single ~35-second Styku scan produces a 3D body model plus a comprehensive set of measurements covering body shape, body composition, anthropometric ratios, health-risk indicators, and metabolic estimates. This article is the index to every metric Styku produces and where each one appears. Use the cross-links to drill into specific definitions, ranges, and interpretation guidance.

The 3D Body Model

The first output of every scan is a textured 3D model of the client's body, rotated freely in Styku Studio and viewable in the client's mobile app.

Green lines on the model are the digital tape measurements (circumferences). Clicking a line highlights it and displays the exact value.
The model is the visual reference operators use during consultations to point at fat distribution, posture, or progress between scans.

Body Composition Metrics

Styku reports the following body-composition values for every scan. These are calculated from the 3D scan data using either the Basic (BIA-comparable) or Phoenix (DEXA-validated) algorithm — your active model determines which value the report displays. See What are the Styku Basic and Phoenix body composition models, and which should I use? for the comparison.

Metric | What it is

**Body Fat Percentage (BFP)** | Percentage of total body weight that is fat tissue. The headline body-composition metric.

**Fat Mass** | Total weight of fat tissue (lbs / kg).

**Lean Mass** | Total weight of non-fat tissue (muscle, bone, organs, water).

**Bone Mass** | Bone tissue weight, reported as part of the body composition breakdown.

**Android Mass** | Fat stored in the upper body (abdominal/thoracic region). Higher cardiometabolic risk.

**Gynoid Mass** | Fat stored in the lower body (hips, thighs, buttocks). Lower cardiometabolic risk than android.

**Visceral Fat Area** | Estimated fat surrounding internal organs. Healthy target: under 100 cm².

**Subcutaneous Fat (android region)** | Fat just under the skin, measured in the stomach area.

**Appendicular Lean Soft Tissue Index (ALSTI)** | Sarcopenia indicator: arm + leg muscle mass adjusted for height². Targets: men ≥ 7.0, women ≥ 5.5.

**Body Composition Category** | Auto-assigned classification: Essential Fat, Athlete, Fit, Average, or At-Risk. Thresholds differ by Basic vs Phoenix model.

Body composition is validated against the DEXA Hologic gold standard with a correlation of 0.95+ with DEXA for fat mass (within 1–2% of DEXA reference values). See How does Styku estimate body composition, and how accurate is it?

For full definitions, healthy target ranges, and clinical interpretation, see:

What do the body composition metrics in a Styku scan mean? — per-metric definitions and target ranges
What body composition metrics appear on page 2 of the Styku Summary Scan Report? — page-2 report layout
Body Composition Metrics — Body Fat, Lean Mass, Weight, and Sarcopenia — risk category tables (male/female) and references
What are the body composition categories in the Styku scan report? — the 5 categories explained

Circumference Measurements

Styku captures 21 default circumferences from the 3D model — including waist, hips, chest, thighs, biceps, calves, neck, and more. Each measurement can be:

Reviewed individually by clicking the corresponding green line on the 3D model
Compared across scans using the digital tape tool
Customized — operators can add, hide, or relocate measurement bands per their workflow

See:

What are the 21 circumference measurements in the Styku summary report? — full list
How do I view, adjust, and customize circumference measurements in Styku Studio? — customization workflow
How accurate are Styku's circumference and length measurements? — accuracy benchmarks

Anthropometric and Ratio Metrics

Styku calculates standard anthropometric ratios used in clinical and fitness assessment:

Metric | What it is

**BMI** | Body Mass Index — weight relative to height² (kg/m²). Population-level health proxy.

**WHR** | Waist-to-Hip Ratio. Cardiometabolic risk indicator.

**WHtR** | Waist-to-Height Ratio. Often a stronger predictor of disease risk than BMI alone.

**TLVR** | Trunk-to-Limb Volume Ratio. A Styku-specific 3D-shape risk indicator.

See What are the anthropometric and ratio metrics in a Styku scan? and Styku anthropometric metrics: BMI, WHR, WHtR, and TLVR explained.

Shape, Surface Area, and Volume

Captured directly from the 3D body model:

Shape Score — composite score reflecting overall body shape distribution. See What is Shape Score and how is it calculated?
Body Surface Area — total external surface area in m².
Body Volume — total enclosed volume from the 3D scan.

See What are surface area and volume measurements in Styku and how should I interpret them?

Health-Risk Metrics

Styku layers health-risk estimates on top of the raw composition and shape data:

Styku Health Score — composite health-risk indicator derived from BMI + waist circumference + trunk-to-leg volume ratio (distinct from Shape Score). See Styku Health Score — How It's Calculated and What It Means.
Chronic Disease Risk Estimates — risk categories for metabolic syndrome, type 2 diabetes, cardiovascular disease, and other conditions, derived from validated literature including Mayo Clinic reference data. See the health-risk section of the scan report for the full list.
Waist Risk Range — clinical waist-circumference thresholds (men > 40 in, women > 35 in indicate increased risk).
HealthPass Health Screen (where applicable) — additional health-screen output combining 3D scan data with optional blood-test panels. HealthPass health-risk prediction accuracy: 92% (distinct, independently validated metric — not benchmarked against DEXA, separate from the 0.95+ correlation body-composition figure).

See:

What is the Health Risks summary in the Styku scan report?
Where can I find Health Risk Mayo data metrics in Styku Studio V5?

Caloric and Metabolic Estimates

For fitness and weight-management workflows, Styku derives:

Basal Metabolic Rate (BMR) — calories needed at rest. See What is basal metabolic rate (BMR) in the Styku scan report and how is it calculated?
Total Daily Energy Expenditure (TDEE) — calorie need adjusted for activity level. See What is total caloric expenditure and how is it calculated in Styku?
Fat-Loss Calculator — estimates the calorie deficit required to reach a target body composition. See How do I use the Fat Loss Calculator in the Styku scan report?

Posture Metrics

Styku also produces posture indicators from the 3D model:

Shoulder Shift and Hip Shift — lateral asymmetry indicators. See How do I interpret shoulder shift and hip shift results?

Where Each Metric Appears

Location | What it shows

**Styku Studio — Dashboard** | High-level summary after a completed scan: 3D model, key body composition values, body-comp category. Starting point for the consultation.

**Styku Studio — Body Metrics tab** | Complete list of every measurement, ratio, and index from the scan, organized by category (circumferences, posture, volumes, regional). Each entry has a trends view (requires ≥ 2 scans). See *How do I use the Body Metrics tab to review all scan measurements?*

**PDF Summary Scan Report** | Multi-page client-facing report. Page 1: profile + headline body composition. Page 2: detailed body composition metrics (BFP, fat mass, lean mass, android/gynoid, visceral, subcutaneous). Subsequent pages: circumferences, health-risk summary, caloric goals, fat-loss calculator. Delivered via email and downloadable from the mobile app.

**Styku mobile app** | Client-facing view of their scans, including the 3D model, body composition, circumferences, trends, and the Shape module.

**Email delivery** | Clients receive a link to their full scan report after each scan.

Body Composition Models — Which Affects What

Body fat percentage, lean mass, and body composition categories all depend on which body-composition model is active for your account:

Basic Model — BIA-comparable algorithm. Category thresholds set lower to reflect BIA's known underestimation tendency in overweight/obese individuals.
Phoenix Model (DEXA-validated, default in Studio V5.56+) — algorithm validated against DEXA reference. Category thresholds reflect DEXA-comparable ranges.

The model only affects body-composition outputs — circumferences, shape, anthropometric ratios, BMR/TDEE, and posture metrics are model-independent.

See What are the Styku Basic and Phoenix body composition models, and which should I use?

Notes and Caveats

All body-composition values are estimates derived from algorithmic interpretation of the 3D scan. They are not a substitute for a clinical DEXA scan, but they reproduce DEXA values within 1–2% on average.
Some derived metrics (ALSTI, certain disease-risk categories) require the Advanced/Phoenix model.
For clients under 18, lean mass and certain composition metrics are intentionally suppressed (see Why is lean mass not available for patients under 18 years old?).
Manual body-fat entry from an external device (DEXA, InBody, etc.) is supported if you'd rather use your own measurement — see How do I enter my own body fat percentage from an external device instead of using Styku's measurement?

If a specific metric isn't showing up where you expect it, see Why am I not seeing certain body composition analyses or modules in Styku?

Applies to: All Styku configurations.

Related Resources

What do the body composition metrics in a Styku scan mean?
What are the body composition categories in the Styku scan report?
What body composition metrics appear on page 2 of the Styku Summary Scan Report?
What are the 21 circumference measurements in the Styku summary report?
What are the anthropometric and ratio metrics in a Styku scan?
Styku anthropometric metrics: BMI, WHR, WHtR, and TLVR explained
What are surface area and volume measurements in Styku and how should I interpret them?
What is Shape Score and how is it calculated?
Styku Health Score — How It's Calculated and What It Means
What is basal metabolic rate (BMR) in the Styku scan report and how is it calculated?
What is total caloric expenditure and how is it calculated in Styku?
How do I use the Body Metrics tab to review all scan measurements?
What are the Styku Basic and Phoenix body composition models, and which should I use?
How does Styku estimate body composition, and how accurate is it?
What is body composition?
Body Composition Metrics — Body Fat, Lean Mass, Weight, and Sarcopenia