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Old 04-24-2006, 01:34 PM   #1
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Difference in morning and afternoon testing

I never take meds on the day of testing even if testing is done in afternoon until afterwards.

That being the case................will tsh, ft3 & ft3 be higher or lower in the late afternoon. Time of testing on last 3 labs about 4:00 in afternoon.

I used to always get them done early in morning before meds.

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Old 04-24-2006, 03:43 PM   #2
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Re: Difference in morning and afternoon testing

Hi Shmily - I want to know this also - good question!
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Old 04-24-2006, 09:54 PM   #3
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Re: Difference in morning and afternoon testing

TSH in an unmedicated person will be highest in the hours between 9 at night and dawn. For testing purposes, if she can be waiting on the lab's doorstep when they open, she'll get a higher reading than she'll get for the rest of the day.

But in a medicated person, I'm not sure that will work to achieve a high TSH. The med messes with the pituitary, and I'm not sure it will very quickly adjust and spew out a lot of TSH just because one day's med is skipped.
And I don't know what happens to FT3/4, either. I don't think they adjust within mere hours, but I'm not sure.

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