Whole blood histamine for undermethylation and histamine patterns Plasma zinc, serum copper, and ceruloplasmin for copper-zinc imbalance and free copper patterns Urinary pyrroles / HPL for pyroluria and zinc/B6 depletion patterns Homocysteine, SAM, SAH, and SAM/SAH ratio when methylation efficiency needs clarification Vitamin D, CBC, CMP, B12, folate, glucose, and inflammatory markers for general metabolic context Organic acids, gut, mold, or toxic burden testing when history suggests oxidative stress or environmental load How these mechanisms integrate within the Walsh Approach OCD symptoms often arise from a biochemical constellation rather than one isolated neurotransmitter defect
Brouwers J, Brewster ME, Augustijns P
Nemkov, T., Hansen, K
10th ed
Studies with rats have shown that free 4-hydroxyproline and 4-hydroxyproline-containing di- and tri-peptides in the portal vein account for approximately 30% and 70% of the total food-derived 4-hydroxyproline measured in the plasma (Osawa et al