Which three frequencies are listed for diathermy?

Which three frequencies are listed for diathermy?

• A. 13.56, 27.17, 40.68
• B. 13.56, 20.00, 60.00
• C. 10.00, 20.00, 30.00
• D. 15.00, 25.00, 35.00

Answer: (A)

Shortwave diathermy uses three standard RF frequencies that are commonly allocated for medical devices in the ISM bands to safely heat tissue. The trio typically listed is 13.56, 27.12, and 40.68 MHz. The option showing 13.56, 27.17, and 40.68 MHz matches this set, with 27.17 MHz reflecting a minor rounding or labeling variation you might see in practice (the intended frequency is around 27.12 MHz). The other choices list frequencies that are not the established diathermy bands, so they don’t fit the standard shortwave diathermy frequencies.

Shortwave diathermy uses three standard RF frequencies that are commonly allocated for medical devices in the ISM bands to safely heat tissue. The trio typically listed is 13.56, 27.12, and 40.68 MHz. The option showing 13.56, 27.17, and 40.68 MHz matches this set, with 27.17 MHz reflecting a minor rounding or labeling variation you might see in practice (the intended frequency is around 27.12 MHz). The other choices list frequencies that are not the established diathermy bands, so they don’t fit the standard shortwave diathermy frequencies.