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All health health services Having a blood test? Here are the answers to common questions

Having a blood test? Here are the answers to common questions

A woman smiles and drinks a glass of water while sitting on her front porch.

29 September 2021

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3 min read

Can you exercise after a blood test? What about drinking? And what’s the deal with fasting and water intake? Questions about blood tests are super common, so we thought we’d answer a few of them. 

Can you exercise after a blood test?

Not right away. And it’s especially important to avoid any exercise that uses the arm you had your blood test on for a couple of hours. 

After that, it’s always a great idea to listen to what your body tells you. Make sure you drink some water, and rest if you feel lightheaded or drained. Your body may need a moment. Reach out to your GP if you have any concerns. 

Also, if your blood test requires fasting, make sure you eat afterwards before you do... well, anything really. The gym can wait – just be kind to yourself!

Can you drink alcohol after a blood test? 

It’s probably best to avoid alcohol straight after a blood test. Water is a much better choice. Your body will likely appreciate the H2O as well, considering blood tests might make you feel a bit dehydrated. 

How long to avoid alcohol really depends on how you’re feeling. Some people feel fine after having their blood drawn, and some don’t. And everyone metabolises alcohol differently too. 

Just be aware that if you fasted before your test, your empty stomach can heighten the effects of alcohol. As always, it’s essential to listen to your body. 

How long should you fast before a blood test?

This is an important question to ask your doctor or blood test provider. Some tests don’t require fasting, while others do. It all depends on the type of data that your doctor is looking for. 

The best way to get the right information for your situation is to go directly to the source. Either your doctor or the pathologist will be able to tell you. 

A masked woman is having a blood test. She has a red band around her arm.

Some tests don’t require fasting, while others do. It all depends on the type of data that your doctor is looking for.

How much water should I drink before a blood test? 

Unless your doctor tells you otherwise, go ahead and drink water before your blood test. Being hydrated will only make the entire process easier. After all, blood is almost 50% water - so go to town! 

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Reviewed by the healthylife Advisory Board August 2021.

This article is for informational purposes only and does not provide medical advice, diagnosis, or treatment. Any information published on this website or by this brand is not intended as a substitute for medical advice. If you have any concerns or questions about your health you should consult with a health professional.