Concierge cardio-respiratory testing · London
VO₂ max test (cardiopulmonary exercise test), the gold standard of cardio-respiratory fitness and preoperative risk assessment.
A VO₂ max test (CPET) directly measures oxygen uptake, CO₂ output and ventilation during maximal exercise on a treadmill or bike — the gold standard of cardio-respiratory fitness, preoperative risk assessment, exertional dyspnoea workup and elite training prescription.
Key facts
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Definition
A VO₂ max test (CPET) directly measures oxygen uptake, CO₂ output and ventilation during maximal exercise.
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45–60 minute test
Consultation, spirometry, mask fitting, ramp exercise and structured recovery — end-to-end within an hour.
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Consultant-led
Conducted and reported by a consultant respiratory physician or sports cardiologist — not a generalist.
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Direct gas-exchange measurement
Breath-by-breath analysis of O₂ and CO₂ — the only test that measures cardio-respiratory fitness directly.
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Foundation of preoperative risk
The gold-standard input to major-surgery risk assessment, anaerobic threshold and post-op outcome prediction.
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Complements echo and lung function
Sits alongside resting echocardiography and spirometry — quantifies function under load, not at rest.
How the test is run
From consultation to report — what happens, in order.
Seven steps, run under one consultant. The whole appointment takes about an hour.
- 01
Before
Consultant consultation
Detailed history, medications, symptoms and goals — training prescription, dyspnoea workup or preoperative risk.
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Before
Baseline spirometry + ECG
Resting lung function and 12-lead ECG — both anchor the exercise data that follows.
- 03
On the day
Face mask fitted
A close-fitting mask connected to the metabolic cart — checked for leak, calibrated in front of you.
- 04
On the day
Ramp exercise protocol
Treadmill or upright bike, workload rising every minute — pace escalates until you reach true maximal effort.
- 05
On the day
Maximal effort achieved
Peak VO₂ recorded at symptom-limited maximum — RER, heart-rate and workload targets confirm a valid test.
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After
Post-test recovery monitoring
Continuous ECG and BP recorded through the recovery window — arrhythmia and ischaemic changes are captured here too.
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After
Structured report
A full CPET report — peak VO₂, anaerobic threshold, ventilatory efficiency and a concrete clinical impression.
What it shows
The measurements a CPET actually produces.
Every CPET report is built from the same core variables — read together, they separate cardiac, pulmonary and deconditioning limitations.
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Peak VO₂ (mL/kg/min)
The single best measure of cardio-respiratory fitness — benchmarked to age and sex-matched norms.
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Anaerobic threshold
The workload at which lactate accumulates — anchors both training zones and preoperative risk.
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Oxygen pulse (O₂/HR)
A surrogate for stroke volume during exercise — flat curves raise concern for cardiac limitation.
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Ventilatory efficiency (VE/VCO₂)
How efficiently you clear CO₂ — elevated slopes point to heart failure or pulmonary vascular disease.
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Breathing reserve
Headroom between peak ventilation and maximal voluntary ventilation — low reserve suggests pulmonary limitation.
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Heart rate reserve
Unused chronotropic capacity at peak — high reserve can point to cardiac deconditioning or beta-blockade.
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Chronotropic competence
Whether heart rate rises appropriately with workload — blunted responses have prognostic weight.
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Red flag: severe ischaemic ECG changes — urgent cardiology
Exercise-induced ST depression or VT stops the test — same-day cardiology review is arranged.
What we do with the results
A CPET result is only useful if it changes what happens next.
Every report ends with a concrete plan — training, rehab, prehabilitation or onward referral.
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Personalised training zones
Heart-rate and power zones set from your true anaerobic threshold — not a generic percentage of max HR.
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Cardiac rehabilitation prescription
Objective baseline VO₂ used to build a graded, safe rehab plan after MI, revascularisation or heart failure.
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Preoperative optimisation
Low anaerobic threshold triggers prehabilitation — targeted training before major abdominal, thoracic or vascular surgery.
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Weight loss + lifestyle
Repeat CPET quantifies real cardio-respiratory gain — the metric that matters more than the scale.
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Cardiology referral if ischaemia
Ischaemic changes, arrhythmia or abnormal O₂ pulse route straight to a consultant cardiologist.
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Respiratory follow-up if exertional dyspnoea
Ventilatory or gas-exchange limitation prompts CT, lung function testing and respiratory review.
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Elite training prescription
Endurance and team-sport athletes get zone-based programming, lactate steady-state and race-day pacing.
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MDT review
Complex results discussed with cardiology, respiratory and sports medicine — one coherent plan.
Red flags
When a CPET result becomes a same-day escalation.
The findings that halt the test or trigger urgent cardiology or respiratory review.
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Severe ST depression on exercise
Ischaemic ECG changes at low workload — stops the test and triggers same-day cardiology review.
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Exercise-induced VT
Sustained ventricular tachycardia on the treadmill — an emergency finding requiring immediate cardiology input.
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Chronotropic incompetence with syncope
Blunted HR rise with pre-syncopal symptoms — device or electrophysiology assessment usually follows.
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Severe pulmonary hypertension
Very low VO₂, elevated VE/VCO₂ and desaturation — pulmonary vascular workup needed urgently.
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Peak VO₂ < 14 mL/kg/min
A prognostically severe result — advanced heart failure and transplant assessment thresholds.
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Post-COVID exertional intolerance
Disproportionate deconditioning with normal resting tests — CPET is the objective anchor for long-COVID assessment.
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Unexplained exertional oxygen desaturation
Falling SpO₂ on exercise despite a normal resting test — points to interstitial or pulmonary vascular disease.
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Suspected exercise-induced asthma
Ventilatory limitation with wheeze on recovery — bronchodilator challenge and respiratory follow-up.
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Cardiac amyloidosis on CPET
A restrictive haemodynamic pattern on exercise — imaging and specialist cardiology assessment triggered.
Sources
Guideline bodies behind this guide.
Reviewed against joint AHA/ESC, BTS, ATS and ERS guidance on cardiopulmonary exercise testing.
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American Heart Association / European Society of Cardiology. Joint scientific statement on cardiopulmonary exercise testing.
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British Thoracic Society. Guidelines and clinical resources on cardiopulmonary exercise testing.
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American Thoracic Society. Statement on cardiopulmonary exercise testing.
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European Respiratory Society. Recommendations on the clinical use of cardiopulmonary exercise testing.
Reviewed by Pulse Atlas Editorial Board, . Published 2026-07-30; last modified 2026-07-30; next review 2027-07-30. Reading time ~5 minutes.
Frequently asked
Everything patients ask about VO₂ max testing.
Quick answers on what CPET measures, how long it takes, and why it’s the gold standard for preoperative risk.
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What is a VO₂ max test?
A cardiopulmonary exercise test (CPET) that directly measures oxygen uptake, carbon dioxide output and ventilation during maximal exercise on a treadmill or upright bike. It is the gold-standard objective measure of cardio-respiratory fitness.
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How long does the test take?
End-to-end, about 45–60 minutes: consultation, baseline spirometry and ECG, mask fitting, an incremental ramp exercise protocol lasting 8–12 minutes, and a monitored recovery period.
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Do I need to be fit to have a VO₂ max test?
No. CPET is used across the full spectrum — from preoperative patients with heart failure to elite endurance athletes. The protocol is scaled to your capacity.
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Why is CPET the gold standard for preoperative risk?
Peak VO₂ and anaerobic threshold predict post-operative morbidity and mortality after major surgery better than any resting test — and they identify patients who benefit from prehabilitation.
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What should I bring?
Comfortable exercise clothing and trainers. Bring an up-to-date medication list, any recent echocardiogram or lung function report, and details of your goals — training, symptom workup, or surgery.
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Is a VO₂ max test safe?
CPET is very safe when performed in a properly equipped setting with a consultant present. Serious complications are rare — continuous ECG, BP and SpO₂ monitoring pick up problems early, and the test is stopped at the first sign of concern.
Related tests
Looking for a different test?
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Cardiac stress testing
Exercise ECG for ischaemia and rhythm — the resting cousin of CPET.
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Lung function test
Resting spirometry, lung volumes and diffusion capacity.
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Heart health screening
Full cardiac work-up — bloods, BP, ECG and imaging.
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All tests
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In practice, in London
Booking vo2 max test privately in London — what actually happens
With vo2 max test, the London question is usually about report turnaround and the radiologist reading it — not whether the scan is available. Waiting lists on the NHS for vo2 max test vary widely by borough and by how the GP letter reads. Privately in London, we can normally offer a slot inside the same week, sometimes within 48 hours if there’s a cancellation. The difference isn’t clinical quality — the consultants are frequently the same faces you’d see on the NHS — it’s the calendar.
A private vo2 max test pathway in London usually looks like this: an initial consultation, any diagnostics booked at a nearby facility (most within Zone 1 or 2), and a written report sent to you and your GP within a few days. The consultants we work with hold NHS posts alongside their private lists, which keeps the standards consistent across both settings. For vo2 max test specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.
Honesty about expectations is part of the job. A private vo2 max test appointment in London won’t change the underlying medicine — the guidelines, the consultants, and the equipment are largely the same as on the NHS. What it changes is speed, continuity, and the amount of time you get to actually talk through the findings. Everyone we route to is GMC-registered and works within CQC-regulated facilities.
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