There is no "normal" microbiome result, so this chapter separates the clinically useful targeted markers (calprotectin, H. pylori, SIBO) from full 16S/shotgun portraits and overpromising home tests — and shows when testing is actually worth it.
V. Diagnostics and therapy
The microbiome's therapeutic toolbox is narrower than the shelves suggest: a probiotic only works when matched to strain, dose, and indication, FMT is the most powerful but strictly indicated, and a new generation of tools is arriving alongside them.