Exercising before blood test: Looking to get a... - Thyroid UK

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Exercising before blood test

Curious123 profile image
5 Replies

Looking to get a fasting blood test tomorrow. Does anyone know if going to parkrun first at 8am and then having the blood test straight after, still fasting except for water, will impact on the results at all?

Was looking to test TSH, FT4, FT3, RT3, Antibodies.

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Curious123
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SlowDragon profile image
SlowDragonAdministrator

presumably this is private test

Not a good idea to test on a Saturday as sample won’t be delivered until Monday

We usually advise testing early Monday or Tuesday morning

Post back immediately

We don’t recommend testing RT3

Very expensive test and doesn’t tell you much

Are you also testing vitamin D, folate, ferritin and B12

Curious123 profile image
Curious123 in reply toSlowDragon

This is a private blood test but venous draw and will be sent directly to the lab as currently visiting Australia. I already know vitamin D, iron, folate and B12 levels are optimal. Just wanting to know if the exercise pre-blood test will have any significant impact or not.

SlowDragon profile image
SlowDragonAdministrator in reply toCurious123

It might push TSH ….or lower Ft3

Suggest you make sure you eat breakfast before the run

TiggerMe profile image
TiggerMeAmbassador

Pretty standard advice... but it depends what you hope to understand from the results 🤷‍♀️ to make results comparable thtey need to be under the same conditions

To prepare for a blood test, you should:

Avoid strenuous exercise for 24-48 hours before the test.

Avoid alcohol for 48-72 hours before the blood draw.

Do not perform any exercise except gentle walking on the morning of the test.

tattybogle profile image
tattybogle

late reply ,, but you ay find some interesting stuff in here : healthunlocked.com/thyroidu... after-high-intensity-interval-exercise-ft4-ft3-up-from-normal/12-hours-later-both-down-from-normal/both-return-to-normal-by-72hrs

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