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It will also discuss how to prepare for a cholesterol test in general. Read more: What Is a Healthy Blood Sugar Reading in the Morning? Health symptoms that might require a fasting blood test, labtestsonline.org.uk/tests/direct-ldl-cholesterol, labtestsonline.org.uk/tests/glucose-tests, diabetes.org/diabetes/medication-management/blood-glucose-testing-and-control/hypoglycemia, mayocliniclabs.com/test-catalog/download-setup.php?format=pdf&unit_code=8677, labtestsonline.org.uk/tests/triglycerides, labtestsonline.org.uk/tests/vitamin-b12-and-folate, Everything You Need to Know About Fasting Before a Blood Test. Hemoglobin test: How you prepare, Mayo Clinic Staff. In these, strict avoidance of sugar and fat is required. Diabetes management: How lifestyle, daily routine affect blood sugar. Blood pressure readings: Why higher at home? However, fasting is required before commonly ordered tests for glucose (blood sugar) and triglycerides (part of the cholesterol, or lipid, panel) for accurate . 1 In the pathological laboratory, the technicians take the blood from a vein in the arm using a needle. In some situations, a doctor may recommend a fast that's about 6 to 8 hours. Make your tax-deductible gift and be a part of the cutting-edge research and care that's changing medicine. An example of a test that requires fasting is a blood glucose test, which measures your blood sugar levels. Because of this, it takes only a small amount of artificial sweeteners to sweeten foods. Hormonal contraceptives can elevate blood sugar too, according to the University of Colorado. Still, it is a good idea have your thyroid levels checked under the same conditions each time. Blood urea nitrogen (BUN) test: How you prepare, Mayo Clinic Staff. Diabetes diet: Should I avoid sweet fruits? The increase in blood sugar is greatest about 1 hr after eating, so the peak effect would not be realized. Click here for an email preview. Fasting allows a doctor to get accurate readings for measurements that are influenced by the food you eat, such as your blood sugar levels or cholesterol levels. Factors That Affect Your Thyroid Test Results - Verywell Health Additionally, polyunsaturated fats can help lower LDL levels. Blood pressure medications: Can they raise my triglycerides? These include: These may prevent you from getting enough of your medication into your system. If we combine this information with your protected If you had a snack, a cup of coffee, or even a full breakfast, tell the technician when you have your blood drawn. Dr.DanielleWeiss is the founder of the Center for Hormonal Health and Well-Being, a personalized, proactive, patient-centered medical practice with a unique focus on integrative endocrinology. Continue with Recommended Cookies. Blood test: Complete blood count. Some can change thyroid function or get in the way of your body's ability to absorb thyroid medications. The National Center for Complementary and Integrative Health notes that diets containing too much saturated fat and trans fat are the leading causes of high blood cholesterol.