Body fat scales that use bioimpedance analysis (BIA) send a low-level electrical current through the body to estimate body composition. Because this current may potentially interfere with an ICD or pacemaker, manufacturers of cardiac devices have traditionally advised caution with these scales.
A small study did suggest that BIA may be safe in patients with ICDs, with no interference detected during real-time monitoring. However, the evidence base is limited and current guidance remains cautious. The safest approach is to use a standard weighing scale that measures weight only, with no bioimpedance function. These are widely available and carry no risk to your device.
If you specifically need body composition analysis for medical or fitness reasons, discuss it with your cardiologist before using a BIA device. For a more detailed review of the evidence, see our FAQ on bioimpedance analysis and ICDs.