Originally Posted by glitterbug86
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. "