Diagnostics
Measure what matters, then build the right plan from real data.
At Prefusion Health, diagnostics aren’t a one-time snapshot; they’re the foundation for smarter training, better recovery, and long-term health. We use objective testing to reveal how your body is performing today, so we can personalize what you do next with precision.
Our Services
Start or level up your health journey with testing and analysis that turns data into clear next steps.

Am I losing fat or muscle?
DEXA Body
Composition
See fat vs. muscle (incl. visceral fat) and bone density for a smarter plan.

How much should I eat daily?
Resting Metabolic Rate Testing
Learn your true calorie needs so nutrition finally matches your metabolism.

What heart rate should I train at?
VO2 Max Fitness
Testing
Find your fat-burning heart-rate zones and improve a key longevity marker.
Test and re-test |
DEXA + RMR
Packs
These packs apply to
DEXA and RMR only, and you can mix any combination across 2, 3, 6, or 9 visits. For added flexibility,
the 6 and 9 Packs are
shareable
with one additional person.
2 Pack
Perfect for a clear start and first checkpoint.
3 Pack
Baseline, mid-point, retest for momentum.
6 Pack
Multiple cadence for consistent change.
9 Pack
Best value, keep motivation high all year.

HOW IT WORKS
- Establish Your Baseline
Complete your DEXA, VO2 Max, and/or RMR testing to capture objective performance and body composition data.
- Interpret The Results
We review your numbers and highlight what’s most important; including key constraints, risks, and opportunities.
- Build Your Next Steps
You leave with clear priorities: what to change first, what to track, and which Prefusion pathways fit your goals.
- Retest & Refine
Repeat testing over time to confirm progress and adjust your strategy based on real outcomes.
Why Our Testing Is Different
Our diagnostics don’t live in a PDF that gets forgotten. We connect your results to coaching, clinical oversight, and a clear action plan; so your data actually drives outcomes.
Real People. Real Progress.
Data-Driven Trust
Behind every result is a personalized plan built from real testing and medical insight. Our clients don’t just feel better; they understand why their progress is happening and how to sustain it long term.




How To Prepare For Your Upcoming Visit?
Test prep for DexaFit Body Scan
- For best scan results, we ask that you please FAST for 2 hours prior to your DexaFit Scan.
- Avoid exercise or other vigorous activity on the day of your scan and stay well-hydrated.
- Wear tights, sports bra, compression shorts or other athletic attire without any metal buttons, snaps, zippers or bra clasps. Also refrain from any clothing or undergarments that contain metallic imprinting inks or threads. Lastly, please wear socks.
- You’ll be asked to empty your pockets and remove metal items like watches, belts, glasses, and jewelry.
- Avoid taking any calcium supplements in the 24 hours prior to the scan. This includes multivitamins as well as antacids such as TUMS®.
- No gastrointestinal contrast, barium or other contrast mediums and radionuclides within 48 hours of your appointment.
- During the scan you will relax on an open-air DEXA scan table. The process is quick and uses minimal radiation, equivalent to about four bananas worth of exposure, or a few hours of natural background radiation. The DexaFit scan is a straightforward, non-invasive procedure designed for your comfort and convenience, providing valuable insights into your body composition.
- Please note that the Dexa scanner has a weight limit of 330 lbs.
Test Prep for VO2 Max Fitness Test
- You must FAST for at least 3 hours prior to the test; no food or beverages other than water.
- Avoid exercise or any other vigorous activity for at least 12 hours prior to testing.
- Get adequate sleep the night before
- Refrain from caffeine, tobacco or taking any supplements or stimulants (other than prescribed medications) on the day of your test.
- Avoid alcohol for at least 12 hours prior to testing.
- Wear workout clothes and athletic shoes (the test is done on a treadmill).
- During a VO2 Max test, you'll perform a graded exercise test on a treadmill, starting at low intensity and gradually increasing to your maximum effort. You'll be fitted with a mask that measures your oxygen consumption and CO2 output, providing data on your aerobic capacity. The test is designed to safely determine your fitness level under careful monitoring.
- Your VO2 Max is is a reflection of your aerobic power, and your body’s ability to keep performing under strenuous activity for longer periods of time. Calculating your VO2 Max is important for both athletes and non-athletes. Ultimately, knowing the maximum amount of oxygen you can take in is an important part of cardiorespiratory fitness.
Test Prep for RMR Metabolic Test
- You must FAST for at least 5 hours prior to the test; no food or beverages other than water. Note: It is important that you stay well hydrated with room temp water prior to your test.
- Avoid exercise, stressful situations and vigorous activity for at least 12 hours prior to testing.
- Get adequate sleep the night before (test is ideally performed in the morning)
- Refrain from caffeine, tobacco or taking any supplements or stimulants (other than prescribed medications) on the day of your test.
- Avoid alcohol for at least 12 hours prior to testing.
- Wear comfortable clothing. Note: casual and even business attire are also acceptable for this test as you will just be relaxing in a chair.
- Your RMR accounts for about 70% of your Total Daily Energy Expenditure (TDEE). Knowing it is essential for accurately gauging your daily calorie needs. This information is critical whether you're aiming to lose weight, build muscle, or maintain your current state. It's the foundational number on which your nutrition and fitness plans should be built.
Test Prep for Biological Analysis
- Fast for at least 8 hours prior to your appointment (water only).
- Avoid caffeine the morning of your draw.
- No exercise for at least 12 hours before testing.
- Hydrate well — drink plenty of water before your appointment.
- Resume normal eating immediately after your blood draw
- Take medications as prescribed unless instructed otherwise
- Our comprehensive bloodwork analysis is processed through your health insurance. If your insurance plan includes a copay or deductible, you will be responsible for any additional charges billed by the lab. Our fee is separate and applies for the testing along with the 30-minute consultations with a medical practitioner, which is not covered by insurance.
Ready to Measure Your Baseline?
Book diagnostics and get the clarity you need to optimize what comes next.
Frequently Asked Questions
Do I need all three tests?
Not necessarily. We’ll recommend the right combination based on your goals; fat loss, muscle gain, performance, or metabolic health.
How long does testing take?
Most appointments are efficient and structured. The exact time depends on which tests you choose.
How often should I retest?
If you’re actively working toward a goal, retesting every 90 days is a strong cadence for measurable progress.
Is VO2 Max only for athletes?
No. VO2 Max is one of the best indicators of cardiovascular fitness and is useful for anyone focused on health and longevity.
How is RMR different from online calorie calculators?
Online calculators estimate. RMR testing measures your actual metabolic output so you can set nutrition targets accurately.
Can diagnostics be used with other Prefusion programs?
Yes; diagnostics pair perfectly with GLP-1 plans, peptide therapy, hormone optimization, and performance coaching.


