The doctors I ask don't care one way or the other.
kitty, who works in a lab, feels it makes a difference.
You could get your blood drawn fairly early (I can get it done at eight in the morning) and then take your meds.
I take my Synthroid at six, and get my blood draws about ten in the morning, consistantly. I tell myself consistantly is good, but kitty may disagree with me on the subject, and I would defer to her opinion.
I would like to see her input on the subject, again.
With all the medical jargon, like the last time. :^)
It is not fasting itself that is the issue. It is whether it is a good idea to take meds prior ti the blood draw.
Taking t4 containging meds before a blood draw will raise the free t4 by about 20% for several hours after swallowing the pill. This is due to a surge of t4 being released from the med. This will not affect TSH or free t3, only the free t4 result. This could result in a free t4 looking higher than it really is and make cause a doctor to think your levels are ok.
So I would do as AR said. Fast and have the blood drawn early in the morning so you can take the med immediately after the blood draw.
Consistency is very important.
TSH keveks are also at their highest in the morning and some cases of mild hypo can be missed if the blood is drawn later in the day when levels begin to drop. TSH is at the very lowest around midnight.
I just noticed my spelling/keyboard errors!!
Can we get spell check?
I wrote this post once and lost it. Then I quickly posted it again and didn't double check it. Yikes!! Make sure to get those "keveks" checked!
T4 meds (ie, Synthroid, Lexoxy) have a very long half life (6-7 days) and are sometimes administered once per week in non-compliant patients.
It takes about 1 week for the med to build up to a consistant level in your blood, so todays dose isn't actually working today, but in a few days time.
The surge of t4 released upon ingestion only effects the blood work and is not immediately converted by the tissues into t3. T3 is the more biochemically active form of the hormone.
T3 meds have a very short half life ~ less than 1 day~ so the dose is usually split into 2 doses per day.
I never learned to type properly in school.
I need to proofread my writing better. Asking for spell check really is a cop-out.
What are our kids going to do if they always have spell check?
Even with mis-spellings, we can usually figure out what the other person is saying. An e-mail just went around that if the beginning and ending letters in a word are correct, our brains automatically correct for the wrong letters.
The wonders of the human mind-aahhh!
I am taking Cytomel and Synthroid and will soon have a TSH and T4 bloodtest. Does it matter if I take my pills in the morning before the blood test? I saw the response when it just involved Synthroid, and I wondered if taking Cytomel affected your opinion. Thx.
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