can you drink water before blood work

Yes, you can and should drink water before blood work. Drinking plenty of plain water keeps you hydrated, which makes it easier for the clinician to find a vein and draw blood. Water does not affect blood test results because it contains no nutrients, so it does not interfere with the substances being measured. However, you should avoid any other liquids like juice, coffee, or soda before the test, especially if you are fasting. Plain water is allowed even if the test requires fasting for 8-12 hours to ensure accurate results.