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Old 10-26-2009, 06:00 PM   #1
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irish eyes 1025 HB User
Question Do I need to fast for a TSH and Free T-4 test?

I am having my TSH and Free T-4 blood tests taken again after my last test a month ago. My Free T-4 was 3.03 so I'm hoping for a better result this time. I had a whole battery of tests before and had to fast because they were testing everything. Must I fast for these two tests? Today at work I googled that and it said no, but you all are the experts here. What do you think? Does it make a difference?

 
Old 10-27-2009, 04:17 AM   #2
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Re: Do I need to fast for a TSH and Free T-4 test?

Hey,

Well there is no need to fast for the TSH and FT4 test BUT if you're trying to catch your levels at their worst then I would suggest you get tested as early in the morning as possible. I'm definately no expert, just diagnosed 7 weeks ago with hypothyroidism. But when I was going back for my second blood test last week I also looked around for info regarding the best time to be tested and whether it made a different to fast. I didnt fast but did get an appointment for as early in the morning as possible - 9am.

Last edited by moderator2; 10-27-2009 at 05:35 AM. Reason: please do not post websites except as described in the Posting Policy

 
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Old 10-27-2009, 10:47 AM   #3
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Re: Do I need to fast for a TSH and Free T-4 test?

Quote:
Originally Posted by glitterbug86 View Post
Hey,

Well there is no need to fast for the TSH and FT4 test BUT if you're trying to catch your levels at their worst then I would suggest you get tested as early in the morning as possible. I'm definately no expert, just diagnosed 7 weeks ago with hypothyroidism. But when I was going back for my second blood test last week I also looked around for info regarding the best time to be tested and whether it made a different to fast. I didnt fast but did get an appointment for as early in the morning as possible - 9am.

Hey, part of my last message got deleted because I referenced a website. Sorry, wasn't thinking. But basically this is the info I was trying to show you:


"Usually, our doctors tell us that fasting is not necessary for thyroid blood tests, nor does it matter when tests are done - particularly TSH tests. ........... Interestingly, however, research by Scobbo et. al. in 2004 showed that TSH tests declined in 97 of 100 of the people studied - by an average of 26.39% - when compared to early morning, fasting, TSH test results. This resulted in as many as 6% of patients being reclassified from the diagnosis of subclinical hypothyroidism to "normal." ......... Essentially, these researchers retested patients later, when they could get a normal range result and declare the patients to be free of hypothyroidism ........ Researchers also don't even know how fasting affects thyroid function or TSH values, or why TSH values would be different based on fasting or non-fasting. ........ But be aware that if you test later in the day and you've eaten, you are likely to have a lower TSH level than if you test earlier in the day with fasting. "

 
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