Is it OK to drink water before a blood test?

Data: 2020-12-03

It’s fine to drink water before a blood test, unless you’re instructed otherwise by your doctor. This is different from some surgical procedures, which may require you to have a totally empty stomach.

Tap or bottled water are both OK, but leave the squeeze of lemon for another time. Seltzer and club soda are off-limits. Carbonated beverages, flavored or otherwise, shouldn’t be consumed during a fast, and neither should any type of tea.

Tip
• Water hydrates your body and makes your veins plumper and more visible. Stay hydrated in the two days before your test. Also try drinking several glasses of water right before the blood draw to make it easier for the nurse or other medical professional to find a vein.


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