Basal Metabolic Rate (BMR) testing gives information regarding a person's metabolism.  The BMR test calculates the number of calories required to keep your body functioning at rest.  The results gives patients a calorie amount for weight loss and a calorie range for maintaining weight. 

Your BMR can be used to help you gain, lose, or maintain your weight. By knowing how many calories you burn, you can know how many to consume. To put it simply:

Is your goal to maintain your weight? Consume the same number of calories that you burn.

Is your goal to gain weight? Consume more calories than you burn.

Is your goal to lose weight? Consume fewer calories than you burn.