Olympus
This is the main site for the diagnostics division of Olympus. This site does cover all of their products so searches can come up with some interesting surprises.
http://www.olympus.co.uk/diagnostica/
I found this page to be very helpfull, as it lists all of thier tests and provides links to pdf documents about each test.
http://www.olympus.co.uk/diagnostica/reagents_marketinginformation.cfm
Couldn’t find more clinical information, though this might be due to Olympus not having a drug division in the company like Bayer/Roche/Abbott