Q1. Can patients outside the recommended age range use BIA devices?
Charder's Body Composition Analyzers have a specified age range for measurement accuracy. For example, the recommended age range for best results is between 6 and 85 years old for the MA601 and MA801. This is not due to safety concerns - BIA is safe for all ages, and you can safely measure someone that is outside of the recommended age range with no problem!
Body Composition results need to be validated against gold standards to evaluate accuracy, and improve continuously algorithms. Research ethical boards are understandably averse to approving research that may involve radiation (in the case of DXA) and other risk factors for children, especially those under 6 years old. What's more, a 3-year old may be unable to even reach the hand electrodes, or stand on the device long enough to conduct measurements for data collection. As such, while children under 6 can use Charder'sdevices safely, it is hard to prove with empirical data that the same level of accuracy can be guaranteed for a 2-year old, compared to a 6-year old, or other results within the recommended age range.
The same applies to those over 85 years old - while there are no safety concerns, gathering sufficient measurement data for healthy adults over this age can be difficult, especially for the purposes of data validation, where enough males and females within an age bracket, of various different ethnicities are required. Charder expands the age range only after we have sufficient data, ensuring that we stand by the results provided by our devices.
Q2. Can BIA be used by users with stents?
Patients with embedded electronical medical devices (ex: pacemakers) are prohibited from using Bioelectrical Impedance Analysis (BIA) devices, because of the fear of the electrical current used for measurement affecting the embedded device.

Because stents are not powered by electricity, there is no potential safety risk caused by BIA measurement.

In general, there is the potential for slight measurement inaccuracy if the patient has significant amounts of metal embedded in their body, as metal is highly conductive, which may cause the device to misinterpret results. However, stents are not nearly large enough to make a noticeable difference like a large metal implant in your foot might.
Q3. Do more frequencies mean the device is more accurate?
Not necessarily. It is important for the device to have enough frequencies to calculate body composition results. Generally speaking, 250kHz is recognized to be necessary for reliable ICW:ECW calculations. But beyond that, impedance results might be measured but not used.
Q4. What is the difference between a multi-segmental vs a traditional BIA device?
Hand-to-hand BIA devices measure impedance passed between the arms, and the lower body is estimated based on the impedance measured in the upper body. Conversely, leg-to-leg devices measure impedance passed between the legs, and the upper body is estimated. For subjects with balanced upper and lower bodies, these traditional devices may provide reasonably accurate estimates for whole-body values. However, measurement accuracy is compromised if there is significant upper-lower imbalance (ex: due to top-heavy strength training). More importantly, multi-segment technology allows Charder devices to provide calculations for each segment separately, which is absolutely essential for advanced training and tracking.
Q5. How will results be affected by measurement after exercise?
Exercise can cause a temporary change in impedance, and thus may influence measurement results. Intensive exercise can increase blood circulation that may continue for an extended period of times, and we recommend avoiding measurements shortly after exercise.
Q6. Why does eating and drinking before measurement affect results?
Food and drink may cause temporary changes in weight and impedance. Drinking 1000cc of water will result in a 1kg weight gain. But has this water been absorbed to become part of the body (and thus able to affect impedance), or is it still stored in the stomach? Is undigested food just pure weight?

Temporary weight change will change interpretation of impedance and thus inaccurate results. In addition, it cannot be determined how food affects impedance during the digestion process. Although everyone digests food at a different rate, 2 hours is a general rule of thumb for a certain level of digestion, and thus helping subjects to avoid "measuring immediately after a meal".

To learn more, please view our video guide!
Q7. How can I buy a Charder device?

Charder devices are sold through approved distributors. Please contact us at [email protected], and we will put you in contact with your nearest Charder distributor.

Q8. How can I get in touch with customer service?

If you have questions or problems not covered by the FAQ, please contact us at: [email protected]
To speak with a customer service representative, please call: +886-4-2406-3766, between Monday ~ Friday (8:30 am – 5 pm) (GMT +8).

Q9. How can I tell if my scale needs to be recalibrated?

The best way to check if a scale needs calibration is to use a known weight to confirm if the scale returns the correct measurement. If the measurement is incorrect, please contact our local service provider for calibration services.

Q10. Why is the level of the device important? How do I check if it is level?

If a device is placed on uneven ground, measurement results may be less accurate. Applicable Charder Medical scales will have a bubble level indicator, making it easy for users to check if the scale is level. On certain devices, the scale will contain a level compensation mechanism instead.
If the surface is uneven, please adjust the feet of the device until the device is level, and make sure the scale is stable before use.

Q11. Printing/transferring measurement results

Some Charder Medical devices can output results using thermal printer and/or transfer to PC. Devices with print/transfer compatibility will be marked accordingly in their information page and user manual.

Q12. Can I use a different adapter with my device?

We strictly recommend using the adapter supplied with the device. If the adapter is broken or damaged, please contact our local service provider to purchase a replacement. Usage of another adapter is not covered under the warranty, and any subsequent damage will not be covered.