What should I know about wie lange vor blutabnahme nichts trinken?

Before a blood draw, standard advice is to fast for 8–12 hours, drinking only water. Coffee, tea, juice, or other beverages (even sugar-free) can affect lab values like blood glucose, triglycerides, or liver enzymes. Plain water is usually allowed because it maintains hydration and makes vein access easier. The exact fasting duration depends on the specific tests: fasting glucose and lipid panel typically require 8–12 hours; some hormone or metabolic tests may need only 6 hours. Special tests (e.g., oral glucose tolerance test) have different instructions. Always follow your doctor’s or lab’s specific guidance. Evidence is based on clinical practice and laboratory standards, not controlled trials. Caveat: Fasting longer than 12 hours may cause dehydration and skewed results. Children, pregnant women, and diabetics need individualized advice.