To prepare for a microbiome test (e.g., for seniors), avoid antibiotics for at least 4 weeks and probiotics for 2 weeks before sampling, as they can temporarily alter bacterial composition. Collect the stool sample in the morning before eating. Avoid high-fiber or fermented foods for 24 hours prior, as they may transiently affect the microbiome. These recommendations are based on standard protocols from test providers and labs, not on randomized trials. In seniors, age-related changes in gut flora can influence results, so comparing with age-matched reference values is advisable. MyBody-X offers such tests, but the clinical relevance of individual findings is often unclear. Discuss abnormal results with a physician before taking action.
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