Top 3 Antibody FAQs

#1 – Which Test to Choose?

Great Plains Food Antibody + Candida
IgG + Candida  (via blood-spot or blood draw)


This test is a cost effective way to reliably test IgG(1-4) reactions and, like the Dunwoody test, includes the added benefit of including a Candida marker. The easy blood-spot collection means this test may be a preferred option for some patients.

Dunwoody Labs IgG + Complement (C3d)
IgG + Candida + C3d  (via blood-draw)


This test provides the highest level of insight into IgG food reactivity since it not only tests IgG(1-4), but also Complement 3d. Measurement of Complement 3d directly demonstrates the foods causing inflammatory activity.

#2 – What’s More Relevant: IgA or Complement (C3d)?

IgA = Potential future reactivity
IgA may uncover ‘hidden’ sensitivities.


Elevated IgA (without elevated IgG) indicates that the food has the potential to become to an IgG reaction / food sensitivity in the future.
Dunwoody’s salivary IgA test ($239) may be prescribed alongside any of our Food Antibody test options.

C3d = Present Inflammation
Complement is a quantifiable biomarker of tissue inflammation.


Complement provides you with reliable insight as to what extent food reactions are occurring in the present moment.
For more information on complement you can watch a short video on complement here.

#3 – Dried Blood Spot Or Blood Draw?

Both are equally valid collection options
Confirmed by Validity Testing


RN Labs only works with laboratories that have conducted extensive validity testing and calibrations to ensure appropriate congruence between collection methods (so that either method correlates reliably).