What should I know about nuchtern zur blutabnahme kaffee?

Whether coffee is allowed before a blood draw depends on the specific tests. For most routine panels (e.g., complete blood count, thyroid function), plain black coffee without milk, sugar, or cream is usually acceptable because it contains no calories. However, caffeine can temporarily raise blood pressure and heart rate, and for fasting glucose or oral glucose tolerance tests, even black coffee is not allowed because it can stimulate insulin secretion. Coffee (especially unfiltered) may also slightly increase triglyceride and cholesterol levels. Many labs recommend only water for 8–12 hours before blood work. The safest approach: check with your lab or doctor whether coffee is permitted for your specific tests. When in doubt, skip it. Evidence: practice guidelines; no strong RCT evidence covering all test types.