The InBody Test provides a comprehensive view of body composition balance.
Body water, proteins, minerals, and body fat, which are the components of the human
body closely relate to the status of our health. Using the method of quantitative
analysis, these elements of body composition and body composition analysis provide
basic information required for assessing the status of the body.
The InBody utilizes the BIA method.
First used in the late 1960s, the bioelectrical impedance analysis (BIA) method
measures body water by obtaining the impedance index. The impedance index is obtained
by applying a small alternating current on the body, based on the principle that
the body contains water and that the level of electric resistivity, i.e., resistance,
changes according to the amount of water in the body.
In the late 1980s, the BIA method was a single-frequency whole-body impedance measurement
that yielded inaccurate results, and required the use of statistical variables for
correction of measurements. However, the Empirical data used in the formula were
highly specific and could not be applied universally, and in turn affected overall
The InBody technology overcomes limitations of early BIA.
Motivated through understanding the cause of BIA’s inaccuracy as a limitation in
technology, the solution for the limitation could be solved through technological
innovation. In 1996, Dr.Cha developed the InBody, “world’s first commercial BIA
body composition analyzer, capable of both direct measurement of body segments and
Today, the advancement to BIA technology brought out by the InBody with exceptional
precision and ease of use is widely recognized by experts worldwide. The InBody
is mentioned in hundreds of research papers published every year across various
fields such as nutrition, sports, and obesity.
1. Independent trunk measurement through Direct Segmental Measurement
Body water, proteins, minerals, and body fat that compose of the human body closely
relate to the status of our health. Using the method of quantitative analysis, these
elements of body composition and body composition analysis provide basic information
required for assessing the status of the health of the body.
However, the InBody accurately analyzes the total body composition by separately
measuring impedance of the body trunk (aka torso), which accounts for as much as
50% of total body weight and has different cross-sectional areas than the arms or
2. Accuracy through Multi-Frequency measurement
The InBody’s Multi-Frequency measurement method accurately measures intracellular
water and extracellular water by using multiple broadband frequencies in the range
The ability of the current to pass through cell membranes varies according to its
frequency. Accuracy of the earlier BIA method were not reliable, as it only used
a single frequency at 50kHz to distinguish between intracellular and extracellular
The InBody overcame the limitations of the early BIA, which relied only on a constant
proportional formula for deriving total body water. With introduction of water balance
category, The InBody is widely used in fields of nephrology and rehabilitation therapy.
3. 8-Point Tactile Electrode with Patent Thumb Electrode for ease of use
By taking the structural characteristics of the human body into consideration, the
InBody uses 2 current and voltage electrodes for each hand and foot, requiring the
user to grasp and step on to a total of 8 electrodes.
The design significantly improves ease of use for repeated tests, even when the
measuring posture is changed or when measurements are taken multiple times. The
measurement always starts and ends at the same points—the wrists and the ankles—ensuring
4. Accounting for special body types without using statistical variables
Statistical variables are factors used in a formula for calculating body composition,
such as gender, age, or body type.
They were used to compensate for the inaccuracy of the earlier BIA methods. However,
since the InBody uses direct impedance measurement, multiple frequencies, and 8- Point Electrode Tactile with Patent Thumb Electrode, body composition can be
derived accurately without having to use any statistical variables.
By detecting sensitive changes in body composition primarily through impedance measurement
the InBody has proven an unusually high level of precision, showing a high correlation with DEXA, a gold standard in body measurements. The InBody
is widely used clinically and in research where monitoring changes in body composition