Alexis,
This was was bugging me!! I have Stedman's Plastic Surgery/ENT/Dentistry Words book and it wasn't in there, either. However, I did a google search and got Unterberger Stepping test. Check it out for yourself--just go to Google.com and type Unterberger stepping test. I learned something new, too!!
I don't know how many people are aware that eponyms are no longer to be typed in the possessive form (per AAMT and other references)--therefore it would be Unterberger, not Unterberger's. I've had docs question me about this and I just photocopy the AAMT page and any other reference (Stedman's word books, Dorland's Medical Dictionary, AMA Book of Style, etc.) to show document this. A lot of them do look weird (Crohn disease, Alzheimer disease), but I guess I'm getting used to it!
kkb
_________________________
kkb (Karyn), who considered herself a newbie after 18 years doing MT and even though she is no longer working in the field, still remembers what it was like to be a newbie!