What is Total Body Water Percentage?
Total Body Water Percentage is the total amount of fluid in a person’s body expressed as a percentage of their total weight.
Approximately 50 –65% of the weight of a healthy person is water. Water plays a vital role in many of the body’s processes
and is found in every cell, tissue and organ. Maintaining a healthy total body water percentage will ensure the body
functions efficiently and will reduce the risk of developing associated health problems.
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FEATURES AND FUNCTIONS
PREPARATIONS BEFORE USE
Inserting the Batteries
Open the battery cover on the back of the measuring platform. Insert the
supplied AA-batteries as indicated.
Note:
Be sure that the polarity of the batteries is set properly. If the batteries are
incorrectly positioned the fluid may leak and damage floors. If you do not intend to use this
unit for a long period of time, it is advisable to remove the batteries before storage.
Please note that since the batteries were inserted at the factory, their energy
levels may have decreased.
Positioning the Monitor
Place the measuring platform on a hard, flat surface where there is minimal
vibration to ensure safe and accurate measurement.
Note: To avoid possible injury, do not step on the edge of the platform.
Handling Tips
This monitor is a precision instrument utilizing state-of-the-art technology.
To keep the unit in the best condition, follow these instructions carefully:
• Do not attempt to disassemble the measuring platform.
•Store the unit horizontally, and place it so that the buttons will not be
pressed accidentally.
• Avoid excessive impact or vibration to the unit.
• Place the unit in an area free from direct sunlight, heating equipment,
high humidity, or extreme temperature change.
• Never submerge in water. Use alcohol to clean the electrodes and glass
cleaner (applied to a cloth first) to keep them shiny; avoid soaps.
• Do not step on the platform when wet.
•Do not drop any objects onto the platform.
Open as shown.
Direction of the batteries.
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Measuring Platform
1. Display Screen
2. Set Button
3. Arrow (Select) Buttons
4. Ball-of-Foot Electrodes
5. Heel Electrodes
6. Personal Keys
7. Weight-Only Key
Accessories
8. AA-Size Batteries (4)
1.
2.
3.
4.
5.
6.
7.
8.
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How To Measure Total Body Water?
Deuterium Dilution Method is currently used as a typical method to measure a total body water percentage. This
instrument estimates the total body percentage by the analysis (Multiple Regression Analysis) based on the parameter
found by the BIA method.
A mutuality over 0.8 is obtained between this instrument and the “deuterium dilution method”.
Note: Deuterium Dilution Method is in terms of total body water based on the analysis of the dilution of orally ingested deuterium oxide in urine.
Healthy Total Body Water Percentage (%TBW)
The average total body water percentage ranges for a healthy adult are:
Female: 50 to 55%
Male : 60 to 65%
Note: The total body water percentage of a person with a high percentage of body fat may fall below the average healthy ranges.
Daily Rhythm of Total Body Water
Try to measure total body water percentage at the same time of day and under the same conditions. This increases the
accuracy of the readings. The best time is in the early evening, before the evening meal, when hydration levels are more
stable. Total body water percentage tends to be underestimated to a degree if measured immediately after getting out of
bed, not only because of dehydration but also because the fluid in the body will be stored centrally in the body’s trunk.
As the day progresses this fluid becomes more evenly distributed due to the effect of gravity.
On the contrary, it may be overestimated after exercise or taking a bath because of the movement of body water or a rise in
the body temperature despite actual dehydration.
Important Notes
• Take your measurements at the same time of day and under the same conditions.
• Measured results depend on the movement of water in the body and/or changes in body temperature. Factors
affecting total body water levels include sleep, physical activity, eating and drinking, illness and medications, bathing
patterns and urination.
• Take fluid immediately if you have any symptoms of dehydration, particularly after physical activity or bathing.
Symptoms include a dry mouth, headache, nausea, dizziness, skin dryness, a rise in temperature, loss of
concentration, etc. If symptoms persist, consult your doctor immediately.
• Elderly people are at increased risk of dehydration as they have less sensitivity to thirst and other rational symptoms.
• This instrument cannot be used to specifically determine an individual’s recommended total body water percentage.
Look for the long-term changes in total body water percentage and try to maintain a consistent, healthy total body
water percentage.
