The typical fasting time before a blood test is usually between 8 to 12 hours , depending on the specific test. For some tests like lipids, triglycerides, or cholesterol, fasting may be longer, about 12 to 14 hours. For glucose tests, fasting is generally about 8 hours. During fasting, only plain water is allowed; no food, beverages (like coffee or tea), smoking, gum chewing, or exercise should be done before the test. Always follow your doctor's exact instructions since fasting requirements can vary by test and individual health conditions.
