Yes, Naturopaths typically do blood food allergy tests (ELISA IgG, ALCAT, and sometimes RAST IgE). Some also do NAET testing and treatment (www.naet.com ~ I have no financial connections with this site/company, but have gone through the "basic 10" treatments), which uses applied kinesiology (muscle testing) to determin allergies (more subjective, but able to test anything you can touch, so can treat more allergies).
Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD (Lupus?), Osteoporosis, Anemia, Lymphopenia, chronic malabsorption/malnutrition, Lyme Disease (Igenex Lab IgM WesternBlot positive; & as of 7/25/08, IgM is CDC Positive!), etc.; Currently TPN-dependent.
Meds: Zofran, Vitamin B12 Shots, Heparin (to flush PICC line).