What should I know about nuchtern blutabnahme wasser?

For a fasting blood draw (e.g., fasting glucose or lipid panel), plain water is generally allowed because it does not affect blood sugar or lipid levels. However, you should avoid sugary, caffeinated, or milky drinks as they can skew results. Some labs even recommend drinking a glass of water before the draw to improve vein visibility and prevent dehydration. That said, there is no universal rule – certain tests (e.g., fasting gastrin or specific hormone assays) may require strict fasting including no water. Always check with your lab or physician for specific instructions. The evidence is based on clinical practice and guidelines, not on large randomized trials. DNA or microbiome tests do not provide relevant information here. In short: water in moderation is usually fine, but when in doubt, stay completely fasted.