I suspect others will help find a consultant (I can't recommend one because of who I work for), but when you are ready to seek accreditation to ANS/ISO/IEC 17025, I can recommend that you talk to several accrediting bodies, not just one.
The accrediting bodies operating in North America that are recognized Nationally and/or internationally are:
IAS, A2LA, NVLAP, L-A-B, ACLASS, SCC/CLAS (Canada), and EMA (Mexico)
The recognition is from:
NACLA (National Cooperation for Laboratory Accreditation), accrediting bodies are IAS, NVLAP, L-A-B, ACLASS
APLAC (Asia Pacific Laboratory Accreditation Cooperation), bodies are IAS, A2LA, NVLAP, SCC/CLAS, EMA
ILAC (International Laboratory Accreditation Cooperation), bodies are same as for APLAC.
Hope this helps.
Hershal