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Drinking a cup of coffee before a blood test that require to be fasting is not allowed because coffee can alter the hormonal balance of the body which lead to abnormal testing results at the end. As such people should not drink coffee before a fasting blood test. Farewell To The Fasting Cholesterol Test Harvard Health To know what happens if you dont fast before a blood test read this list of fasting blood tests. Can i drink coffee before a fasting blood test for cholesterol . Answer 1 of 2. These beverages generally will not affect the. Internal Medicine 38 years experience. I have to fast for 12 hours before blood test. Evidence suggests that the fasting lipid test will overcome the effect of elevated post-prandial triglyceride level. Its recommended that you avoid coffee and other liquids during your fast McKnight said. You never know what kind of nutrient value or additives are in. This is an amount of your bloods cholesterol content. Secondly can you drink co