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

Blood tests can detect a wide range of parameters: complete blood count, liver and kidney function, blood glucose, lipids, hormones, vitamins, minerals, inflammatory markers, and pathogens. They reflect your current physiological state. A DNA test, in contrast, analyzes genetic variants associated with predispositions for metabolism, nutrient processing, or disease risk – not your current status. Evidence for DNA-based claims is often moderate (GWAS, observational studies), and individual SNP effect sizes are small. A DNA test can offer clues, e.g., for lactose intolerance (rs4988235) or bitter taste sensitivity (TAS2R38), but it does not replace a blood test. For specific symptoms like fatigue or bloating, a blood test is usually the first step. Combining both approaches can be useful but must be interpreted critically. Caveat: No single test provides a complete picture; lifestyle, diet, and environment are key factors.