Fat Mass vs. Lean Mass
The core split, estimated from the scan: how much of your weight is body fat versus muscle, bone, and organ tissue. Tracked over time, it helps show whether a diet is reducing fat or also costing you muscle.
Body Composition Testing
in San Diego
$150 · Bodystat QuadScan 4000 Assessment + 9-Point Movement Screen
Multi-frequency bioimpedance analysis that gives you what a scale can't: a clear, repeatable read on how much of your weight is fat, an estimate of your lean mass, and how both are changing. Every OmniFit program starts here — and if you continue into training, the $150 is credited toward your first cycle.
The $150 Performance Assessment is booked after your consultation.
OmniFit Performance provides body composition testing in San Diego using the Bodystat QuadScan 4000, a multi-frequency bioimpedance device, at the studio inside Teqneeq FHC — 10772 Thornmint Rd, 4S Ranch, San Diego 92127. The QuadScan 4000 reads the body at four frequencies — 5, 50, 100 and 200 kHz — which is what allows it to separate intracellular from extracellular water rather than estimate total body water from a single reading. The $150 Performance Assessment reports fat mass, lean mass, body cell mass, fat-free and fat mass indices, intracellular and extracellular water, phase angle and segmental analysis, and includes a 9-point movement screen. Results are interpreted by a NASM-certified corrective exercise specialist, and the fee is credited toward your first program, Reset cycle or 5-pack. Follow-up rescans every 4–8 weeks track whether weight change is coming from fat or muscle — including for clients on GLP-1 medications.
The Bodystat QuadScan 4000 holds CE certification as a Class IIa medical device under MDD 93/42/EEC and has FDA clearance. OmniFit Performance uses it to measure body composition. It is not used to diagnose, treat or assess any medical condition, and OmniFit is not a medical provider.
What the Scan Measures
Data a Bathroom Scale Will Never Give You
The scale reports one number and hides everything that matters. Two people can weigh exactly the same and have completely different bodies — and two "identical" weigh-ins can hide muscle loss behind a shift in water. Reading at four frequencies, the QuadScan 4000 measures the fluid compartments separately, so a change in weight can be attributed to fat, to lean tissue or to fluid instead of inferred from the total.
Hydration & Fluid Balance
Total body water plus the ratio of fluid inside versus outside your cells (ICW/ECW). Helps explain day-to-day weight swings; read as a trend alongside how you feel and recover.
Phase Angle
A value calculated from the device's bioelectrical impedance readings. We track it over time as added context, never on its own as a measure of health or readiness to train. Tracked at every rescan.
FFMI & Trend Data
Fat-Free Mass Index puts your muscularity in context of your height — a far better benchmark than BMI. Every rescan builds your trend line, which is where the real answers live.
Sample Scan Report
What the Scan Report Looks Like
Every scan produces a Bodystat report like this one: the raw impedance at each of the four frequencies, the fluid compartments, lean and fat mass against reference ranges, and the indices we track from scan to scan. We walk through every line of it with you at the assessment.
A real QuadScan 4000 report from an OmniFit assessment, shared with the client's permission. Name, age, test date and device details have been removed. Tap a page to view it full size.
How It Compares
Bodystat vs. DEXA vs. Gym Scales
Bodystat QuadScan 4000
DEXA Scan
Gym InBody Kiosk
Smart Scale
Grade of device
Multi-frequency BIA (four frequencies)
Clinical imaging
Consumer BIA
Consumer BIA
Measurement frequencies
4 — 5/50/100/200 kHz
N/A — X-ray imaging
Varies by model (2–3 on common gym models)
Single
Hydration & cellular data
✓ ICW/ECW + phase angle
✗ Not measured
◐ Partial
✗ Estimated
Radiation
None
Low-dose X-ray
None
None
Expert interpretation included
✓ Every scan
Varies by provider
Varies by provider
App only
Tied to a training program
✓ Drives programming
✗ Standalone
✗ Standalone
✗ Standalone
Typical cost in San Diego
$150 (credited toward your first cycle)
$100–200
$0–50
$30–200 device
DEXA remains the research gold standard for a single snapshot of fat and lean mass. It does not read fluid compartments, which is the measurement a four-frequency device adds: intracellular and extracellular water, and the phase angle derived from them. The rest is consistency and context — the same calibrated device, the same protocol, interpreted by the same coach who writes your program. Trend accuracy beats snapshot precision when the goal is changing your body, not photographing it.
On a GLP-1 Medication?
Is Your Weight Loss Fat — or Muscle?
Rapid weight loss on GLP-1 medications like semaglutide and tirzepatide can take a significant amount of lean mass with it — and the scale can't tell you it's happening. Repeated body composition estimates can flag it. OmniFit tracks estimated fat mass and lean mass separately at every rescan, so you and your prescriber know whether the weight coming off is the weight you wanted to lose — and your training and protein targets adjust to protect the muscle you have.
Baseline Before or During
Whether you're about to start a GLP-1 or months in, the first scan gives you a clear, repeatable read on where your lean mass stands today — the estimate everything else is compared against.
Lean Mass Protection
Rescans every 4–8 weeks help flag lean-mass loss early. If lean mass is dropping, resistance training frequency and protein intake adjust immediately — before the loss compounds.
Data You Can Share With Your Doctor
Fat-versus-lean trend data you can bring to your physician if you choose, alongside the scale trend.
The Appointment
What the $150 Assessment Includes
Bodystat Scan
A painless, non-invasive bioimpedance measurement taken lying down — electrodes on hand and foot, results in minutes. No radiation, no claustrophobic equipment.
9-Point Movement Screen
Overhead squat assessment, posture documentation, and joint range-of-motion testing — mapping the compensations and restrictions your body has developed.
Results, Interpreted
Your numbers explained in plain language by a NASM-certified specialist — what they mean, what's normal, and what to prioritize first.
A Concrete Plan
Program recommendations built from your data. The $150 is credited toward your first program, Reset cycle or 5-pack. If not, you keep the data and the plan.
Common Questions
Body Composition Testing FAQ
How much does body composition testing cost in San Diego at OmniFit?
The Performance Assessment is $150 and includes a Bodystat QuadScan 4000 scan reading at four frequencies — fat mass, lean mass, body cell mass, intracellular and extracellular water, phase angle and segmental analysis — a 9-point movement screen, and expert interpretation of your results. The $150 is credited toward your first program, Reset cycle or 5-pack. There are no activation fees.
What is the Bodystat QuadScan 4000?
The Bodystat QuadScan 4000 is a multi-frequency bioelectrical impedance analysis (BIA) device that measures body composition by passing a safe, imperceptible electrical signal through the body. Reading at four frequencies — 5, 50, 100 and 200 kHz — it reads impedance and phase angle directly and separates intracellular from extracellular water; fat mass, lean mass, body cell mass and total body water are estimates calculated from those readings, which multi-frequency analysis makes more robust than a single-frequency reading. It's the same class of device used in clinical and research settings, not a consumer gym kiosk.
How is this different from a DEXA scan?
DEXA uses low-dose X-ray imaging and is the research gold standard for a single-snapshot measurement, typically costing $100–200 per scan in San Diego. The Bodystat uses bioimpedance — no radiation — and reads at four frequencies, which is how it measures the intracellular and extracellular water compartments and phase angle that DEXA does not report at all. The bigger difference is context: OmniFit scans are interpreted by the coach who writes your program and repeated every 4–8 weeks on the same calibrated device, so your trend line drives real programming decisions rather than sitting in a PDF.
I'm on a GLP-1 medication. Why does body composition testing matter?
Rapid weight loss on GLP-1 medications can include significant lean mass loss, and a scale can't distinguish fat from muscle. Regular body composition testing gives you a clear, repeatable read on what kind of weight you're losing, so resistance training and protein intake can be adjusted to protect muscle — and gives you trend data to share with your prescriber. This is one of the most common reasons clients book the assessment.
How should I prepare for the scan?
For the most accurate reading: avoid eating for 2–3 hours beforehand, skip alcohol for 24 hours, avoid intense exercise immediately before, and arrive normally hydrated. Consistency matters more than perfection — we schedule your rescans under similar conditions so your trend data stays clean.
How often should I rescan?
Every 4–8 weeks, depending on your goal. Body composition changes too slowly for weekly scans to mean anything, and quarterly gaps miss course-correction windows. Active OmniFit clients rescan as a built-in checkpoint — it's the accountability layer of the program, not an add-on.
Where does the assessment take place?
At the OmniFit studio inside Teqneeq FHC, a members-only functional health and performance lab at 10772 Thornmint Rd, San Diego, CA 92127, in 4S Ranch. In-home assessments are also available throughout North County and coastal San Diego — including Rancho Santa Fe, Carmel Valley, Del Mar, Encinitas, Carlsbad, and La Jolla. No travel fee in Carmel Valley, Santaluz, Fairbanks Ranch, Rancho Bernardo, 4S Ranch or Poway; elsewhere in our in-home service area a travel fee applies, confirmed before you book.
Do I have to sign up for training to get tested?
No. The $150 assessment is available as a standalone service — you leave with your full results, expert interpretation, and a concrete plan either way. The fee is credited toward your first program, Reset cycle or 5-pack.
Use Cases
What People Come to Coaching For
Coaching is rarely the goal on its own. These are the situations it usually attaches to.
Long-Term Transformation
You want a body that holds up for years rather than a twelve-week push that unravels. The work is built to be repeatable: a plan you can still follow in month nine, progressions tied to what your body tolerates, and a coach who adjusts the plan rather than restarting it.
Fat Loss Without Crash Protocols
Aggressive plans usually fail on the joints or the schedule before they fail on willpower. Training your body tolerates is what makes consistency possible, and nutrition is coached alongside it with individualized macros rather than a template handed over on day one.
Desk-Worker Posture and Mobility
Long sitting hours, stiffness that arrives before the workday ends, and the sense of moving worse than you used to. Programming targets the specific patterns desk work creates, with corrective work built into every session rather than bolted on as a warm-up.
Data-Driven Hybrid Coaching
You travel, your calendar moves, and you want the work to continue anyway. In-person sessions combine with app-delivered programming, the Travel Protocol covers the weeks you're on the road, and the same benchmarks are tracked either way so nothing is guessed between visits.
Know Your Numbers. Then Change Them.
One appointment gives you the baseline most people train for years without: a clear, repeatable read on what your body is made of, how it moves, and what to do about it.
Book Your Consultation Bodystat scan + 9-point movement screen + expert interpretation · Fee credited toward your first cycle 4.98 average across 190+ reviews
NASM Elite Trainer · NASM CPT, CES, PES, BCS, CNC · ACE CES · Precision Nutrition Level 2 Certified Master Coach
Teqneeq FHC · 10772 Thornmint Rd · 4S Ranch, San Diego 92127
In-Home Testing Across North County