Hi Jim (@jimmccarl) - that's a good question. I'm pretty sure genomic testing has to be done to tell whether or not you have the gene. Here's some information on National Institutes of Health site:
https://ghr.nlm.nih.gov/gene/FGFR3
@lauries - this might be helpful for you also. I just found it and it seems to have a lot of good information and related links in the page.

John