Preparing for a blood test involves more than simply showing up at the lab. What you consume beforehand can impact the accuracy of your results. While many people assume black coffee is safe before fasting bloodwork, doctors warn that it may affect certain measurements, including blood sugar, cholesterol, and dehydration-related markers.
According to Dr. Yoshua Quinones, “Black coffee can influence mainly dehydration values. It can also influence your cholesterol, [including] triglycerides and A1C blood sugar levels.” Dr. Quinones recommends following fasting instructions carefully and avoiding coffee before a fasting blood test to help ensure accurate results. Read the full article here.
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