can you drink water before a blood test

Yes, you can and should drink water before a blood test, even if you are fasting. Drinking plenty of plain water helps keep you hydrated, which makes it easier for the healthcare professional to find a vein for drawing blood. Water does not affect the test results because it contains no nutrients or substances that would interfere with the blood analysis. However, other drinks like juice, coffee, or flavored water should be avoided as they can affect the results. If you are fasting for the blood test, you should drink only plain water and avoid all other food and drinks for the required fasting period, typically 8 to 12 hours before the test.