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Metabolic Testing

Have you wondered how many calories YOU burn each day? Measurement of your Resting Metabolic Rate (RMR) provides insight into your unique calorie requirements and allows you to more precisely plan for weight loss and maintenance.

The MedGem® is a handheld device that measures oxygen consumption through a simple breath test. Using oxygen consumption, the MedGem® calculates resting metabolic rate (RMR) which is the number of calories burned at rest. This accounts for approximately 75% of total metabolism. Total metabolism includes resting metabolic rate, lifestyle activities, and exercise. During the test you will be asked to wear a nose clip while you relax and breathe normally through the MedGem® mouthpiece. The test generally takes about 15 minutes.


After the test, a Registered Dietitian will meet with you to discuss your test results and your calorie needs to lose weight or to maintain your weight loss, depending on your goals.
To schedule an appointment: Call the UC Irvine Weight Management program at 949.824.8770.

Before your appointment:
Do not eat or drink anything other than water for at least four hours prior to your appointment.
Do not exercise for at least four hours prior to your appointment.
Do not use any nicotine of any kind within one hour of your appointment.

During your appointment: You will use a disposable mouthpiece and nose clip. You will breathe into the MedGem® device for 10-15 minutes. During this time the MedGem® will measure oxygen consumption and calculate resting metabolic rate (RMR).

UC Irvine Weight Management program patients:
Always consult  your physician before beginning any diet or exercise program. Some of the material used in this site is owned by Health Management Resources® Corporation (HMR®) of Boston, Massachusetts, and is used with its permission. Click on the Notices and Disclaimers link for more specific information about the relationship of HMR and this site and other important information. Notices and Disclaimers


UC Irvine Weight Management Program
19722 MacArthur Blvd
Irvine, CA 92612

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