At-Home Stool Tests: Which Ones Have Been Validated
Some mail-in stool tests carry national screening recommendations and published accuracy data. Others were measured against a reference material and disagreed with each other.
Section
Testing
What a SIBO Breath Test Can and Cannot Tell You
Nearly 30 percent of control subjects test positive. Here is what the diagnostic accuracy literature says about a result that is often read as definitive.
Leaky Gut: What Is Measured, and What Is Sold
Intestinal permeability is a real, quantified research variable. 'Leaky gut syndrome' is a marketing category. The distance between the two is the story.
The CFU Number Is the Wrong Thing to Compare
Labels advertise 50 billion, then 100 billion. The published dose-response evidence does not support reading that number as a ranking.