What is BIA and how does it work?
Bioelectrical impedance analysis (BIA) is a body composition test that works by sending a small electrical signal through the body, enabling the amount of body water to be measured.  From this, fat and lean mass are determined. The more body water a subject has, the more quickly the current is transmitted through the body.  The more fat mass, the slower the current.

BIA is the most commonly used body composition method in the scientific literature.

The test involves having a subject lie comfortably in bed.  Two electrodes are affixed to the back of the subject’s right hand, and two to the top of the right foot.  A weak electrical current (less than that in a dying 9 volt battery) is sent between electrodes.  The current is imperceptible. 

Testing conditions
In preparation, the subject should not have exercised, been in a sauna or consumed alcohol for the 12 hours prior to the test.  We ask that subjects empty their bladders before the test.

Fasting is not required.

How long does a BIA test take?
A BIA test takes less than 5 minutes.

Who makes the BIA instrument?
The lab houses a Quantum X Bioelectrical Body Composition Analyzer, manufactured by RJL Systems (www.rjlsystems.com) in Michigan.