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Cardiolucent

Procedure

Resting Metabolic Rate (RMR) Testing

Precise measurement of how many calories you burn at rest

Resting metabolic rate (RMR) testing measures the number of calories your body burns at complete rest using indirect calorimetry — analysis of the oxygen you consume and carbon dioxide you produce through a comfortable mask. The result is a personalized baseline that anchors nutrition planning, weight management, and metabolic-health interventions far better than generic equations or fitness-watch estimates. Combined with body composition and lipid data, it gives Dr. Kedan a complete metabolic picture.

What's Included

  • Indirect calorimetry measurement of resting oxygen consumption
  • Calculation of resting metabolic rate in calories per day
  • Respiratory quotient (RQ) — substrate utilization at rest
  • Comparison with predicted values for your age, sex, and body composition
  • Integration with body composition (DXA) when available
  • Personalized caloric and macronutrient targets
  • Same-visit results review with Dr. Kedan

How It's Performed

The test is performed in the Beverly Hills office in a quiet, dimly lit room. You lie or recline comfortably and breathe normally through a soft mask or canopy for 15 to 20 minutes. The calorimeter analyzes your breath to calculate exactly how much energy your body is using at rest. Total appointment time is typically 30 to 45 minutes.

How to Prepare

  • Fast for 4 to 8 hours before the test (water is fine).
  • Avoid caffeine for 4 hours and nicotine for 2 hours.
  • Avoid strenuous exercise for 12 hours beforehand.
  • Take routine medications normally unless told otherwise.
  • Schedule the test for the morning when possible — RMR is most reproducible at the same time each day.

What to Expect After

There is no recovery — you resume all normal activity immediately. Dr. Kedan reviews your RMR, respiratory quotient, and comparison data the same day and translates the result into a specific nutrition and activity plan. Repeat testing in 3 to 6 months can confirm that interventions are shifting metabolism in the intended direction.

Indications

  • Weight loss or body recomposition planning
  • Metabolic syndrome or insulin resistance
  • Plateaued progress despite consistent diet and exercise
  • Disordered eating recovery requiring objective caloric targets
  • Athletes balancing performance and body composition
  • Patients on weight-affecting medications (GLP-1 agonists, steroids)
  • Baseline metabolic assessment in a comprehensive cardiometabolic evaluation

Common Questions

Frequently Asked Questions

What is resting metabolic rate testing?
It is a precise measurement of how many calories your body burns at complete rest, performed using indirect calorimetry — analysis of the oxygen you consume and carbon dioxide you produce through a comfortable mask. The result is anchored in your physiology, not an estimate from an equation.
Why is it more accurate than an online calculator?
Online calculators and fitness trackers use generic equations based on age, sex, height, and weight — they often miss the actual RMR by 10% to 20%, sometimes much more. Indirect calorimetry measures your real metabolic rate directly, factoring in lean mass, hormonal status, and individual variability.
How long does the test take?
About 30 to 45 minutes total, with the actual measurement portion taking 15 to 20 minutes.
How do I prepare?
Fast for 4 to 8 hours, avoid caffeine for 4 hours and nicotine for 2 hours, and skip strenuous exercise for 12 hours. Morning is the best time — RMR is most reproducible at the same time each day.
Is it uncomfortable?
No. You lie or recline comfortably and breathe normally through a soft mask or hood. There is no exertion, no needles, and no discomfort. Most patients describe the test as restful.
Are there any risks?
None. The test is entirely non-invasive and well tolerated by all ages.
What does the result look like?
Your RMR in calories per day, your respiratory quotient (which suggests whether your body is burning more carbohydrate or fat at rest), and a comparison against predicted values for your age, sex, and body composition. From this, Dr. Kedan derives personalized caloric and macronutrient targets.
Who interprets the results?
Dr. Kedan personally reviews every test and integrates the RMR with your body composition, lipid profile, and goals to build a coherent metabolic plan.
When will I get the results?
Immediately. The device produces a detailed report within minutes, and Dr. Kedan reviews it with you during the same visit.
How do I schedule one?
Call Cardiolucent at (310) 304-5555. RMR testing is performed in the Beverly Hills office, often as part of a comprehensive cardiometabolic evaluation.

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Medical Disclaimer

The information on this site is for general educational purposes only and is not medical advice, diagnosis, or treatment. Reading this site does not create a doctor–patient relationship. Always consult a qualified healthcare professional for personal guidance. If this is an emergency, call 911. Mentions of medications, devices, or procedures are informational and not endorsements. Full medical disclaimer.

†Some listed indications involve investigational/off-label use. Learn more.