I have over 30 years in Field Service on Medical Equipment
Since many OEM's have incorporated electronic connectivity, i.e., intranet/internet, we have had to become certified with a minimum of either A= or Network+. Better yet is to be CCNA, MSCE.
The problem I face is unfortunately my age and the specific skills you learn along your career path do become VERY job specific.
I would recomend consistantly updating and expanding your skills with business management and marketing as well.
This has been an excellent career for me with no regrets.
Remember this, if you work for an OEM, original equipment manufacturer, you will be very narrowly focused on that product group, in my case invasive cardiology.
If you have a weak stomach, best not to become involved in an area where you will be going in and out of surgical suites.
A good start is getting a degree in Biomedical Equipment (BMET) as a generalist eventually getting your CBET (certification) and then exploring options in a discipline or OEM where you have a real interest and or talent.