What should I know about darf man vor der blutabnahme wasser trinken?

Whether you can drink water before a blood draw depends on the specific test. For most routine blood tests (e.g., complete blood count, kidney function, thyroid hormones), plain water in moderate amounts (0.2–0.5 L) is allowed and may even help make veins more visible. However, some tests require strict fasting, such as fasting glucose, lipid panel (cholesterol, triglycerides), or oral glucose tolerance test. For these, only water is permitted, but no other beverages (coffee, tea, juice, milk). Also, certain hormone or metabolic tests can be affected by water intake. The safest approach: Follow the exact instructions from your doctor or lab. If unsure, it's better to remain completely fasting or drink only a small sip of water just before the draw. Drinking too much water can dilute electrolytes and affect values like sodium or creatinine. Evidence: strong clinical practice. Sources: none from provided context.