One Visit, a Complete Picture

The O2Max Metabolic & Respiratory Health Assessment looks at how efficiently your body uses oxygen, how well your lungs and heart work together, and how your body produces energy. You wear a mask connected to a portable metabolic analyzer that measures every breath, at rest and during a guided exercise test.

What’s included

VO2 max test: active metabolic testing on a treadmill or bike
Resting metabolic rate (RMR) test
Spirometry: breathing volume and flow measurements
Heart rate variability (HRV) with a chest-strap monitor
Breathing and CO₂ tolerance checks
A personal report and results review

What You’ll Learn

Dozens of data points, explained in plain language.

Aerobic fitness

Your VO2 max, one of the most widely used measures of cardiorespiratory fitness, plus how it compares with typical values for your age.

Metabolism

Your resting calorie burn, fat versus carbohydrate use at each intensity, your peak fat-burning zone and an estimated metabolic age.

Breathing

Breathing rate, depth and efficiency as effort rises, lung volume and flow, and how well you tolerate CO₂.

Recovery

Heart rate variability as a window into recovery and stress, to guide how hard to train and when to rest.

Who It’s For

Adults who want an objective baseline for their fitness and metabolism
Longevity-focused clients tracking VO2 max and metabolic age over time
Endurance athletes and team athletes looking for precise training zones
People starting a new fitness or weight-management routine who want a data-driven plan
Clinic and performance-center clients, through our partner network

How the Assessment Works

Book and complete your forms, including a pre-exercise health questionnaire.
Prepare: no food for 5 hours, no caffeine for 5 hours, no smoking for 4 hours, and no intense exercise longer than 1 hour in the 24 hours before your test.
Arrive 15 minutes early so you can relax before testing.
Resting test: you lie quietly for about 10 minutes while the analyzer measures your resting metabolism.
Active test: after a 3-minute warm-up, the intensity increases every minute until you choose to stop.
Review: we walk you through your results and what is limiting your fitness.
Plan and retest: you get training zones and a plan to follow for 8 to 12 weeks, then retest to measure progress.

How It Compares With Blood Work

Blood work shows what is circulating in your blood at a single moment. A metabolic and respiratory assessment shows how your heart, lungs and muscles actually perform when you are working. The two are complementary, not interchangeable.

Many people do both: blood work through their healthcare provider, and an O2Max assessment to understand their fitness and guide their training.

Finding testing near you…

Frequently Asked Questions

What is a metabolic health assessment?

It is a set of breath-based tests that measure how your body uses oxygen and produces energy, at rest and during exercise. At O2Max it includes a VO2 max test, a resting metabolic rate test, spirometry and heart rate variability.

How long does the assessment take?

Testing takes about 30 minutes, plus time to review your results. Plan for about an hour in total.

Do I need to be fit to take a VO2 max test?

No. The test adapts to your level and you decide when to stop. Beginners use it to set a starting point, and athletes use it to fine-tune training.

How often should I be reassessed?

Most people retest after 8 to 12 weeks of training, which is enough time to see changes in fitness and fuel use. Longevity clients often reassess every 3 to 6 months.

Where can I get assessed in the U.S.?

Assessments are available through O2Max partner clinics and onsite events. Use Find Testing Near You on this page to see partner clinics in your state and request an assessment. If there is no clinic in your state yet, leave your email and we will tell you when testing arrives.

Is this a medical exam?

No. The O2Max assessment is a fitness and wellness assessment, not a medical exam, and it does not diagnose any condition. The active test involves hard exercise, so everyone completes a health questionnaire first, and some people will need physician clearance. You are welcome to share your report with your healthcare provider.