PTA Physical Therapy Assistant

Answer: D - All of the above. Output frequency, effective radiating area, beam non-uniformity ratio are the labeling requirements recommended by the Food and Drug administration (FDA).

The FDA (Food and Drug Administration) is the federal agency responsible the safety, efficacy, and security of human and biological products, medical devices, the nation's food supply, and products that emit radiation etc. It regulates labeling on packaging.
It regulates liquid chemical sterilants and high-level disinfectants used on semi-critical and critical patient-care devices.
The FDA recommends output frequency, effective radiating area, beam non-uniformity ratio and the type of ultrasound should be indicated on the ultrasound machine.