InBody 770S

When this test is useful

The 770S is a newer generation of professional standing analyser, combining muscle and fat assessment with detailed water results. Repeat visits can track individual regions alongside overall changes. The location needs to select a suitable report and explain what its values mean for the particular person. The S designation means more than a different appearance. The catalogue specifies a different measured frequency set, shorter test and lower minimum testing weight than the original 770 manual.

What the results tell you

Skeletal muscle, fat mass and body fat percentage put weight into context. Regional analysis adds distribution between the arms, legs and trunk. For rapid changes in lean mass, also compare water and testing conditions. An InGrip test is a separate source of information about muscle function.

The water report separates water inside and outside cells and their sum, TBW. ECW/TBW expresses the extracellular share. Follow the ratio alongside litres and the trend: a change in proportion need not mean the same change in total volume. Do not infer fluid needs or a diagnosis from the number alone.

Each limb and the trunk can have their own TBW, ICW, ECW and ECW/TBW. This helps assess whether a change concerns the whole body or a particular region. Interpretation is essential: electrode contact, preparation and the person’s condition are part of assessment, not just footnotes below a chart.

Whole-body and five regional phase angles are reported at 50 kHz. The water report also documents BIVA, a graphical display of the body’s electrical properties. Both support professional assessment but do not act as direct immunity tests or a health score for every cell.

The manufacturer’s list includes VFA, VFL, SMI, FFMI and FMI. Visceral fat area and level are different outputs; do not compare their numerical values directly. SMI describes muscle quantity in relation to height, while assessment of possible sarcopenia also needs strength testing and clinical context.

How the device measures

The 770S measures five regions at five frequencies, producing twenty-five impedance values. Phase angles are reported at 50 kHz. Z0 describes impedance at the zero-frequency limit, associated with extracellular water. It is not another frequency in the listed measurements and is not added to the five-frequency count.

Test procedure and preparation

For follow-up, keep a similar time and interval after meals. Maintain usual fluid intake, recover after exercise and use the restroom before testing. Stand quietly and ensure correct hand and bare-foot contact. BIA is not performed with an active implant. Discuss pregnancy and other relevant medical circumstances with the location beforehand.

Limitations and influences

Z0 does not make a clinical decision, and an additional parameter alone does not establish greater accuracy for every client. A 2 kg minimum does not imply newborn testing: specified age, height and standing procedure still apply. Blood pressure or grip on a combined report comes from a separate instrument. BIA itself does not measure them.

Choosing a device and service

The original 770 has six measured frequencies, while the 770S has five and separately described Z0. Compared with the 580, the 770S adds a 1 MHz frequency and a dedicated water report with further outputs. Both already have regional fluid ratios and phase angles. Ask about the report actually available and the purpose of follow-up; a model number alone does not answer those questions.

Specifications: InBody 770S

Recording time

≈ 30 s

Body weight range

2–270 kg

Height range

95–220 cm

Device weight

35.7 kg

Measurement frequencies

5, 50, 250, 500 kHz; 1 MHz

Contact electrodes

8

Measurement position

Standing

Operating temperature

10–40 °C

Compare models

Where to get tested

We have not documented testing on this device in this country yet. Other facilities may use it.

Frequently asked questions