Can you sell a used ultrasound machine on eBay?

Prescription onlyUsually not.

87% of the FDA's device records of this type are prescription-only, and eBay doesn't allow prescription devices.

eBay doesn't allow any medical device that requires a prescription. Whether a particular ultrasound machine does depends on how its maker registered it with the FDA, and that is printed on the device: look for "Rx only" or "Caution: Federal law restricts this device to sale by or on the order of a physician" on the label.

What the FDA's records say

FDA device type
System, imaging, pulsed echo, ultrasonic (product code IYO)
Device class
Class 2
Prescription-only
4,570 of 5,251 device records (87%)

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