94681 O2 uptk co2 outp % o2 xtrc
Also known as: oxygen extraction test, metabolic rate with gas analysis, VO2 with CO2 measurement
Oxygen uptake and carbon dioxide output testing including measurement of percentage of inspired oxygen extraction during rest or exercise.
In Plain Language
oxygen use measurement with gas analysis; breathing efficiency with oxygen extraction
Clinical Context
Used to assess metabolic rate and oxygen efficiency in patients with cardiopulmonary disease and for functional capacity evaluation.
RVU Breakdown
| Work RVU | 0.20 |
| Total RVU | 0.20 |
Est. Medicare Payment
National estimate based on 2026 CMS PFS Conversion Factor ($33.40). Actual payment varies by locality (GPCI adjustment).
Billing & Documentation
Medicine section codes cover a wide range of non-surgical services. Documentation should include the clinical indication, procedure details, interpretation (if applicable), and any patient-specific findings.
How This Code Compares
With a work RVU of 0.20, this code ranks in the 12th percentile among Medicine codes — 3.9x below the median (0.78). The highest wRVU in this category is 23.92.
Specialties
Frequently Asked Questions
What is CPT code 94681?
CPT 94681 (O2 uptk co2 outp % o2 xtrc) is a Medicine code. Oxygen uptake and carbon dioxide output testing including measurement of percentage of inspired oxygen extraction during rest or exercise.
Who uses CPT code 94681?
CPT 94681 is used by Pulmonology, Cardiology, Internal Medicine. Used to assess metabolic rate and oxygen efficiency in patients with cardiopulmonary disease and for functional capacity evaluation.
When is CPT 94681 used?
Used to assess metabolic rate and oxygen efficiency in patients with cardiopulmonary disease and for functional capacity evaluation.
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CPT® is a registered trademark of the American Medical Association. Data sourced from CMS Physician Fee Schedule RVU26A. Descriptions, synonyms, and clinical context are original content by RVU Edge.