Generally speaking, most CPA's would use the MACRS 7 years recovery period. If one examines the items that are provided by the IRS that are included for the 5 year and 10 year recovery method, I think you will come to the same conclusion, that Medical Equipment is best recovered over a 7 Year period! 5-year property includes:
*Light general purpose trucks.
*Typewriters, calculators, copiers, and duplicating equipment.
*Any semi-conductor manufacturing equipment.
*Any computer or peripheral equipment.
*Any section 1245 property used in connection with research and experimentation.
*Certain energy property specified in section 168(e)(3)(B)(vi).
*Appliances, carpets, furniture, etc., used in a rental real estate activity.
7-year property includes:
*Office furniture and equipment.
*Any motorsports entertainment complex (as defined in section 168(i)(15)) placed in service before January 1, 2008.
*Any property that does not have a class life and is not otherwise classified.
Source: "IRS Website" at Instructions for Form 4562 (2007)