was kann man im blut alles feststellen — can a microbiome test help?

Your question combines two distinct topics: what blood can reveal and whether a microbiome test can help. Blood tests can measure a wide range of parameters – complete blood count, inflammatory markers (CRP), liver and kidney function, blood glucose, lipids, hormones, vitamins, and trace elements. They are a well-established medical diagnostic tool. A microbiome test, on the other hand, analyzes the bacterial composition of the gut. The provided contexts show that evidence for concrete health claims from microbiome tests is often weak. For instance, there is no evidence that a microbiome test can diagnose 'leaky gut' or directly improve endurance performance (VO2max). Gut health may support recovery, but direct performance enhancement is not proven. A microbiome test does not replace a blood test. The two methods serve different purposes: blood measures systemic biomarkers, while the microbiome test offers insights into gut flora. For medical decisions, rely on validated blood tests and medical advice. The evidence for microbiome tests is mostly mechanistic or unclear – be cautious of exaggerated claims.