was essen vor blutabnahme — when to see a doctor?

Fasting before a blood draw is typically required for accurate lipid panels (cholesterol, triglycerides) and fasting glucose. Standard recommendation: 8–12 hours of no food, water is allowed. For hormone or vitamin tests, fasting may be optional – always follow lab instructions. You should see a doctor if your results are significantly outside the reference range (e.g., LDL >190 mg/dL, HDL <40 mg/dL, triglycerides >500 mg/dL), if you have symptoms like fatigue, unexplained weight loss, or pain, or if you have a family history of cardiovascular disease or diabetes. MyBody-X tests provide insights but are not a substitute for medical diagnosis. If results are abnormal or you are unsure, consult a physician. Evidence for fasting guidelines is strong (clinical guidelines), while genetic tests have limited clinical validity.