Should I drink water before a blood test?

Answer by  bl834 (1317)

I always drink a glass of water before heading to the lab for a blood draw. The better hydrated your body is, the easier it is to take blood. Drink extra water the day before too if you can, it really does make a difference.

Answer by  EmmaKitty (236)

The reason you may have been told to drink water before your blood test is because proper hydration allows the phlebotomist to have an easier time taking your blood. The veins are more visible and the blood flows better. Drink a cup/hour a few hours before the test.

Answer by  chels (177)

You are probably told to drink water so you don't get dehydrated. When you are dehydrated, your vessels constrict and it's harder to draw blood.

Answer by  ranica (184)

if it's for glucose testing there are certain types that you must not take, but having a complete blood count drinking water will not distract the result, there is no such thing that you must drink water before taking your blood test

Answer by  Liz59 (10966)

Yes, you can drink as much water as you can. Because water will not bring any major ions into your blood. Drink as much as you want. Again, nothing will happen.