The First Molecular Fitness Blood Test™

Introducing VO Health's flagship blood test of VO₂ Max.

Introducing VO Health's flagship blood test of VO₂ Max.

Test your VO₂ Max with a simple at-home blood test. Uncover how pathways like inflammation, fat metabolism and oxidative stress impact your performance and health goals.

Test your VO₂ Max with a simple at-home blood test. Uncover how pathways like inflammation, fat metabolism and oxidative stress impact your performance and health goals.

Test your VO₂ Max with a simple at-home blood test. Uncover how pathways like inflammation, fat metabolism and oxidative stress impact your performance and health goals.

Reserve a test kit

Secure a limited spot in the early launch

$

179

2027 price $399

Self-collection blood sample kit

Prepaid return shipping

Molecular lab analysis, report & insights

Results review with VO Health's scientists

On-demand support

Use code

HIGHSTEIN

at checkout

Have questions first? E-mail us at customersupport@vohealth.co

The Molecular Fitness Blood Test™ puts gold-standard VO₂ Max testing into a simple, at-home blood test. It goes beyond oxygen alone to estimate and map the unique molecular signatures of fitness from unique proteins in the blood. 

Why VO₂ Max?

VO₂ Max is the gold-standard of cardiorespiratory fitness, a crucial metric of endurance performance, and the best independent clinical predictor of all-cause mortality and chronic disease. Long considered a vital sign by the American Heart Association, this crucial metric is difficult, costly and time consuming to measure using traditional testing methods.

VO Health has been on a mission to take laboratory-grade VO₂ Max testing and make it easy and scalable for athletes, clinicians, coaches and health enthusiasts to do.

Dive Deeper: The Science of VO2 Max

How We Built the Test

Our Molecular Fitness Blood Test is Built on gold-standard lab measurement, deep proteomic profiling, and machine learning trained on thousands of human samples. Our dataset includes a wide range of individuals, ages 18-82, including Olympic rowers, triathletes, marathon runners and cyclists to individuals in their late 70s living with chronic diseases, and everybody in between.

The result: a Molecular VO₂ Max estimate, a unique Molecular Fitness Score, and 10 biological pathway scores that sit underneath your scores - scores such as inflammation, fat metabolism, oxygen transport, oxidative stress.

Dive Deeper: Read VO's Scientific Thesis

a bunch of beads that are in the shape of a snake

3,500+ gold-standard VO2 Max tests

VO's proprietary dataset spans ages 18–82 with VO2 Maxes from 13–77 ml/kg/min, from regular people to hybrid athletes and Olympians.

person riding a mountain bike

1,000 proteins measured per sample

Each blood sample is run through cutting-edge high-throughput proteomics technology that quantifies 1,000+ distinct proteins.

man in gray dress shirt holding black camera

50-protein algorithm

Our model selects the 50 most strongly associated with fitness to estimate VO2 Max and the underlying molecular pathways.

How It Works

We designed our test to be easy, fast and convenient. Once your blood test kit is ready to ship, it arrives at your home or location of choice, takes 5 minutes to complete and ship back to our lab.

WEEK 0

Self collection kit arrives

Collection kit ships to your home or location of choice

WEEK 1

5-minute self-collection. Prepaid return envelope shipped to VO Health's lab.

three clear beakers placed on tabletop

WEEK 2-5

Samples batched and shipped for analysis at our technology partner's laboratory.

financial newspaper with stock chart

WEEK 4-8

Full molecular fitness report delivered to your inbox.

person in blue long sleeve shirt using black Surface

WEEK 8+

Meet with VO Health's health and performance scientists to help you understand your results.

RETEST

Recommended every 1, 3, or 6 months.

WEEK 0

Self collection kit arrives

Collection kit ships to your home or location of choice

WEEK 1

5-minute self-collection. Prepaid return envelope shipped to VO Health's lab.

three clear beakers placed on tabletop

WEEK 2-5

Samples batched and shipped for analysis at our technology partner's laboratory.

financial newspaper with stock chart

WEEK 4-8

Full molecular fitness report delivered to your inbox.

person in blue long sleeve shirt using black Surface

WEEK 8+

Meet with VO Health's health and performance scientists to help you understand your results.

RETEST

Recommended every 1, 3, or 6 months.

WEEK 0

Self collection kit arrives

Collection kit ships to your home or location of choice

WEEK 1

three clear beakers placed on tabletop

WEEK 2-5

financial newspaper with stock chart

WEEK 4-8

person in blue long sleeve shirt using black Surface

WEEK 8+

RETEST

What You Receive: Molecular Fitness Report

Each test comes with a personalized report with an estimated VO₂ Max, the molecular pathways underneath the score, and interpretation support with VO Health’s PhD performance scientists.

Each test comes with a personalized report with an estimated VO₂ Max, the molecular pathways underneath the score, and interpretation support with VO Health’s PhD performance scientists.

1

Molecular VO₂ Max

A proteomic estimate of your VO₂ Max incorporating your unique molecular signature, along with age, sex, weight, and height, and how you compare to others of your age, sex.

1

Molecular VO₂ Max

A proteomic estimate of your VO₂ Max incorporating your unique molecular signature, along with age, sex, weight, and height, and how you compare to others of your age, sex.

2

Molecular Fitness Score & Pathways

Your unique fitness percentile derived from your blood proteome alone, and the 10 biological systems driving your fitness scores, including inflammation, oxidative stress, angiogenesis and more.

2

Molecular Fitness Score & Pathways

Your unique fitness percentile derived from your blood proteome alone, and the 10 biological systems driving your fitness scores, including inflammation, oxidative stress, angiogenesis and more.

3

Health & Performance Insights

Personal review with VO Health’s team to review your results and how to map them to your performance and health goals.

3

Health & Performance Insights

Personal review with VO Health’s team to review your results and how to map them to your performance and health goals.

YOUR MOLECULAR FITNESS FINGERPRINTSAMPLE
10 biological pathways, measured from ~50 proteins in your blood.
InflammationAngiogenesisHormonal SignalingFat MetabolismTissue RepairCarb MetabolismOxidative StressProtein MetabolismMuscle & VascularOxygen TransportInflammationAngiogenesisHormonalSignalingFatMetabolismTissueRepairCarbMetabolismOxidativeStressProteinMetabolismMuscle &VascularOxygenTransport
Your profilePopulation average
MOLECULAR VO₂ MAX
57.3mL / kg / min
MOLECULAR FITNESS SCORE
88th percentile
Illustrative results from a sample Molecular Fitness Report™.

Get Early Access

Reserve a test kit with a $1 deposit. Supplies are very limited in 2026, so we encourage you to reserve your kit to hold your place.

Reserve a test kit with a $1 deposit. Supplies are very limited in 2026, so we encourage you to reserve your kit to hold your place.

Have questions?

Get in touch

Reserve a test kit

Secure a limited spot in the early launch

$

179

2027 price $399

Self-collection blood sample kit

Prepaid return shipping

Molecular lab analysis, report & insights

Results review with VO Health's scientists

On-demand support

Use code

HIGHSTEIN

at checkout

You won't be charged the full amount until your kit is ready to be shipped. Orders will be processed in the order in which they are received.

Frequently asked questions

When will I receive my results?

During our early launch phase, results are delivered via email within 3–5 weeks of receiving your sample. We're actively optimizing our operations and expect to significantly reduce turnaround time in the coming months.

How does the self-collection blood testing device work?

We use a capillary self-collection device developed by Tasso. The device is designed for a comfortable, quick and painless experience. Most users report feeling little to nothing during collection. You can learn more about how it works: https://www.tassoinc.com/tassoplus-video

How does this test compare to other VO₂ Max measurements?

Our test is the most accurate blood-based measure of VO₂ Max that currently exists, explaining 90% of fitness from proteins in the blood. While grounded in gold-standard maximal VO₂ Max data, it measures fitness in a fundamentally new way, and we recommend that you treat it as its own unique lens rather than a direct comparison to a treadmill test or smartwatch.

How often should I retest?

We recommend testing at minimum 1–2 times per year Athletes training for an event are encouraged to track more frequently, every 1-2 months, to track changes in your fitness over time.

What if my score is different from my VO₂ Max exercise test and/or smartwatch estimate?

That's completely expected. This test measures proteins in your blood rather than cardiovascular output, so a direct comparison isn't the right frame. Think of it as a new dimension of fitness data, one that complements your other metrics rather than competing with them.

How often do you update your algorithms?

Our test is currently in its early launch phase, which means it is the first live version of our algorithms that have been released. We are actively updating and improving our algorithms as we receive and analyze new data and insights.

Is your test covered by insurance?

Our test is not a clinical diagnostic test and is not covered by insurance. However this test may be eligible to for FSA/HSA Coverage through Burst. Visit getburst.com/go/vo-health to learn more. This test and report is intended to assist you in maintaining and encouraging a healthy lifestyle, and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The physiological values contained in this report are not provided for medical or clinical purposes. Consult a qualified healthcare provider before making any health-related decisions.

When will I receive my results?

During our early launch phase, results are delivered via email within 3–5 weeks of receiving your sample. We're actively optimizing our operations and expect to significantly reduce turnaround time in the coming months.

How does the self-collection blood testing device work?

We use a capillary self-collection device developed by Tasso. The device is designed for a comfortable, quick and painless experience. Most users report feeling little to nothing during collection. You can learn more about how it works: https://www.tassoinc.com/tassoplus-video

How does this test compare to other VO₂ Max measurements?

Our test is the most accurate blood-based measure of VO₂ Max that currently exists, explaining 90% of fitness from proteins in the blood. While grounded in gold-standard maximal VO₂ Max data, it measures fitness in a fundamentally new way, and we recommend that you treat it as its own unique lens rather than a direct comparison to a treadmill test or smartwatch.

How often should I retest?

We recommend testing at minimum 1–2 times per year Athletes training for an event are encouraged to track more frequently, every 1-2 months, to track changes in your fitness over time.

What if my score is different from my VO₂ Max exercise test and/or smartwatch estimate?

That's completely expected. This test measures proteins in your blood rather than cardiovascular output, so a direct comparison isn't the right frame. Think of it as a new dimension of fitness data, one that complements your other metrics rather than competing with them.

How often do you update your algorithms?

Our test is currently in its early launch phase, which means it is the first live version of our algorithms that have been released. We are actively updating and improving our algorithms as we receive and analyze new data and insights.

Is your test covered by insurance?

Our test is not a clinical diagnostic test and is not covered by insurance. However this test may be eligible to for FSA/HSA Coverage through Burst. Visit getburst.com/go/vo-health to learn more. This test and report is intended to assist you in maintaining and encouraging a healthy lifestyle, and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The physiological values contained in this report are not provided for medical or clinical purposes. Consult a qualified healthcare provider before making any health-related decisions.

When will I receive my results?

During our early launch phase, results are delivered via email within 3–5 weeks of receiving your sample. We're actively optimizing our operations and expect to significantly reduce turnaround time in the coming months.

How does the self-collection blood testing device work?

We use a capillary self-collection device developed by Tasso. The device is designed for a comfortable, quick and painless experience. Most users report feeling little to nothing during collection. You can learn more about how it works: https://www.tassoinc.com/tassoplus-video

How does this test compare to other VO₂ Max measurements?

Our test is the most accurate blood-based measure of VO₂ Max that currently exists, explaining 90% of fitness from proteins in the blood. While grounded in gold-standard maximal VO₂ Max data, it measures fitness in a fundamentally new way, and we recommend that you treat it as its own unique lens rather than a direct comparison to a treadmill test or smartwatch.

How often should I retest?

We recommend testing at minimum 1–2 times per year Athletes training for an event are encouraged to track more frequently, every 1-2 months, to track changes in your fitness over time.

What if my score is different from my VO₂ Max exercise test and/or smartwatch estimate?

That's completely expected. This test measures proteins in your blood rather than cardiovascular output, so a direct comparison isn't the right frame. Think of it as a new dimension of fitness data, one that complements your other metrics rather than competing with them.

How often do you update your algorithms?

Our test is currently in its early launch phase, which means it is the first live version of our algorithms that have been released. We are actively updating and improving our algorithms as we receive and analyze new data and insights.

Is your test covered by insurance?

Our test is not a clinical diagnostic test and is not covered by insurance. However this test may be eligible to for FSA/HSA Coverage through Burst. Visit getburst.com/go/vo-health to learn more. This test and report is intended to assist you in maintaining and encouraging a healthy lifestyle, and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The physiological values contained in this report are not provided for medical or clinical purposes. Consult a qualified healthcare provider before making any health-related decisions.

This test and report is intended to assist you in maintaining and encouraging a healthy lifestyle, and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The physiological values contained in this report are not provided for medical or clinical purposes. Consult a qualified healthcare provider before making any health-related decisions.