Leaky Gut Test: can a microbiome test help?

Whether a microbiome test can help with 'leaky gut' is not clearly supported by current evidence. 'Leaky gut' (increased intestinal permeability) is a controversial concept in clinical medicine, often linked to vague symptoms like bloating, fatigue, or food sensitivities. Microbiome tests assess the composition of gut bacteria but cannot directly measure barrier function. Some research suggests associations between certain microbial patterns (e.g., reduced diversity, increased Proteobacteria) and impaired permeability, but standardized thresholds and prospective validation are lacking. The evidence is therefore best described as 'unclear.' A microbiome test may provide indirect clues, but it is not a diagnostic tool for leaky gut. Clinical tests like the lactulose-mannitol challenge or zonulin measurement are more specific. Be cautious of commercial panels that claim to diagnose leaky gut without robust scientific backing. If you suspect a permeability issue, consult a gastroenterologist for proper evaluation.