Bioelectrical Impedance Analysis (BIA)

BIA access body composition is quick and non-invasive. It can measure and track changes in the amounts of body fluids, fat, and lean body mass, which includes your muscles and organs. The BIA distinguishes where the water is located in your body - either intracellular or extracellular. Functionally the BIA assesses how much of your body is acting as functioning cells (called the body cell mass or "BCM" on the report), transport tissue (extracellular mass or "ECM" on the report) or storage cells (fat). During the test your Body Mass Index (BMI), Basal Metabolic Rate (BMR), Daily Energy Expenditure (DDE) and Phase Angel will be measured and calculated.

How the test is done


Bioelectrical Impedance is measured when a very small electrical signal carried by water and fluids is passed through the body. Impedance is greatest in fat tissue, which contains only 10-20% water, while fat-free mass, which contains 70-75% water, allows the signal to pass much more easily. By using the impedance measurements along with a person's height and weight, and body type (gender, age, fitness level), it is possible to calculate the percentage of body fat, fat-free mass, hydration level, and other body composition values.

The test is done with the RJL System Quantum, which is a pioneer in the field and recognized as the gold standard.

How to prepare yourself for RJL Quantum BIA


Before the test:

What to expect during the test:

Who shouldn't have BIA?



BIA: "Biological material is conductive and constantly changing. Bioelectrical impedance analysis (BIA) can measure the electrical conductive properties of living things, and illustrate their changes over time." - Rudy J. Liedtke