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ARE_you_kidding_me's avatar

Can I still exercise the night before having bloodwork done?

Asked by ARE_you_kidding_me (7854 points ) August 18th, 2014

I want to do my evening jog and I’m having blood work done tomorrow. Will it affect the test(s)? I can’t find a straight answer on the web about this.

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15 Answers

zenvelo's avatar

It shouldn’t have any effect on your blood work. You aren’t changing the chemistry of your blood, just make sure you a re hydrated (it’s harder to draw blood if you’re dehydrated.)

syz's avatar

Yes, you can exercise. I suppose it might artificially lower your glucose levels if you’re also fasting, but if you exercise regularly it shouldn’t matter.

livelaughlove21's avatar

Of course you can.

johnpowell's avatar

I just asked Devi (was a mod here).. She is a actual doctor that is working in a hospital right now.

(16:37:51) Ryan: From fluther:
(16:37:56) Ryan: “Can I still exercise the night before having bloodwork done?”
(16:38:23) Ryan: “I want to do my evening jog and I’m having blood work done tomorrow. Will it affect the test(s)? I can’t find a straight answer on the web about this.”
(16:38:53) Ryan: The asker is not a horrible person so I though I would ask you.
(16:56:20) Devi: yes they can exercise
(16:56:40) Devi: it wont make a diff
(16:57:12) Ryan: Confident in that?
(16:57:17) Devi: yep

JLeslie's avatar

If you exercise hard it might raise your CPK a little, but otherwise I can’t think of a test it would affect. Except if you became dehydrated from it and never rehydrate, but I’m sure you wouldn’t do that. Dehydration can throw off electrolytes.

SadieMartinPaul's avatar

If you were to exercise tomorrow, before your appointment, your blood pressure and pulse might be deceptively high (that always happens to me). But, that wouldn’t affect your blood work. Also, if you exercise tonight, there shouldn’t be any affect whatsoever.

Pachy's avatar

I’m nor supposed to eat anything after 8 p.m. the night before a blood test. That’s the only thing my doctor tells me not to do.

jaytkay's avatar

I’ve had a lot of blood drawn and nobody ever mentioned anything about exercise. The only instruction was that some of the times they had me fast for beforehand.

ARE_you_kidding_me's avatar

@johnpowell Thanks, I was hoping to hear from a doc. I opted to not exercise just in case but I’ll know better next time. It’s also good to know that I’m not considered a horrible person :)

LuckyGuy's avatar

If you want consistent results you should be consistent.
Go to the same lab, the same time and day of the week, eat (or not eat) the same food the day before. Exercise (or not) the same way every time.
There are so many variables that are out of your control so you might as well control the ones you can.
If you are a man, your PSA test results will vary if you ejaculate or engage in “enthusiastic” sex within 24 hours of having your blood drawn. I avoid it for 48 hours.

travisgrrr's avatar

Don’t work out too much and over exhaust yourself that is for sure. Bloodwork is still a certain stress for the body so it is better to have physical forces at your maximum. I usually reduce working out to half an hour in the evening for example before donating blood but of course we are talking about different quantities of blood here

JLeslie's avatar

Bloodwork is stressful? How much bloodwork are you thinking of? It isn’t like donating blood usually, not even close.

LuckyGuy's avatar

I’m an engineer so I treat the test results as data. Presumably the results will be compared with previous and future testing and used to decide on a course of action or, if everything is good, intentional inaction.
For the comparison to have the most value, the initial conditions for all tests should be as close to identical as possible. As many variables as possible need to be eliminated.
For example, a quick rise in PSA can mean prostate cancer, or it can mean you had wild sex 8 hours before having your blood drawn, or maybe you have an infection. Unless the initial conditions are the same you cannot compare the two results and responsibly decide on a treatment plan. This is why the Uro will suggest a retest. “Come back and see me in 2 months.”
If you want consistent results, you need to be consistent.

ARE_you_kidding_me's avatar

I’m an engineer also and I like to trend my health data over time. This is why I asked if exercise skews any of the standard bloodwork.

LuckyGuy's avatar

@ARE_you_kidding_me There you go! If it was my blood work I would not do anything out of the ordinary. I would note what I did and agree with myself to continue to do that same routine every time I had blood drawn. I even made sure (within reason) to eat the same type and quantity of food the previous day – and, of course, there was the no ejaculation within 48 hours stipulation.
I don’t know what blood work you are having but we know that bicycle riding can also elevate PSA.
According to this article exercising can raise testosterone levels for 15 minutes to 1 hour. It did not mention other factors.
Why risk it?
Be consistent and get the best data you can.

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