Final answer:
The maximum current used in galvanic treatments should remain well below the sensation threshold of 1 mA to avoid unpleasant sensations or harm to the body, as currents above this level can become unsafe.
Step-by-step explanation:
In galvanic treatments, the maximum amount of current used should not exceed thresholds that could harm the body. From the information provided, it is clear that while very small currents are generally harmless, current above 5 mA can lead to unpleasant sensations and shocks, while currents in the range of 5-30 mA can stimulate sustained muscular contractions. Importantly, currents of approximately 0.06 A (or 60 mA) can be potentially fatal. Therefore, in the context of galvanic treatments which involve passing current through the body, a conservative upper limit well below these levels should be adhered to in order to be safe.
Given the sensitivity and potential for harm, it is often recommended that the current should not exceed the sensation threshold, which is around 1 mA. It would be wise to remain below this level for a comfortable and safe treatment, ensuring that the current does not approach a level that could be unpleasant or harmful to the client. Therefore, the current should be limited to well below 1 mA for a galvanic treatment.