Genetic (DNA) testing for the presence of most known VCP mutations are available. Genetic counseling may be appropriate prior to testing and for interpretation of results.
Possible test companies include:
Blue Print Genetics
Costs and methods vary by test site. Some accept patient samples, others require contact by your doctor.
General Information on genetic testing for VCP mutations
The article "The Genie's Out of the Bottle", in MDA Quest magazine Volume 15 number 6, is an excellent summary of many of the issues associated with genetic testing.
In Europe, Genetic Testing for IBMPFD is available at: http://www.ruhr-uni-bochum.de/mhg/molgen_vcp_ibmpfd.php (the website is in German, but Google translate works very effectively to convert to English, I do not know about other languages).