I’m trying to understand a pattern in my health and wonder if anyone can explain the differing results in attached tests. The medichecks test was done at 08.30 before food or drink and the other test from gp was 3 weeks later and taken at approx 14.00 hrs after usual food and drink.
Differing test results: I’m trying to understand... - Thyroid UK
Can’t seem to post my 2nd pic.
Free T4 12 (9-21pmol)
TSH 0.88 (0.2-4.5 mul)
I also have high LH and FSH. I am post menopause.
You can test vitamin D here
Needs to be at least around 80nmol
Vitamin D is actually not a vitamin, but a pre-steroid hormone. Extremely common to have low vitamin D in UK anyway but especially with any thyroid issues
There's only your Medichecks results, so can't compare them with your GP results. However, unless all tests are done under the exact same conditions - and your Medichecks one followed our advice - then they can't be compared. Comparing tests done at 8.30am fasting and 14.00 after food and drink is like comparing apples with oranges.
There's a daily circadian rhythm to thyroid hormones - see graphs in this post:
TSH is highest early morning and lowers throughout the day, TSH lowers after eating. TSH is affected by drinking coffee, tea, etc.
All blood test results can be affected by Biotin/B Complex containing Biotin if Biotin is used in the testing procedure (which most labs do).
When taking Levo, FT4 is lowest if you take your last dose of Levo 24 hours before test and highest if you take Levo before the test.
Edited to add:
Now you've posted the GP results, you can see the difference the later test has made to your TSH.
Your FT4 with Medichecks is 16% through range, your FT4 with your GP is 25% through range but there's too many bars on the FT4 graph for me to see well enough to compare what the levels would be like at those particular times.
Thank you SeasideSusie, I understand that now, but didn’t at the time.
But my TSH is higher later in the day than it was on my 1st test, so presumably it was even higher early morning before eating and drinking? I know this is guessing but there’s a difference and I’m trying to understand why.
But my TSH is higher later in the day than it was on my 1st test, so presumably it was even higher early morning before eating and drinking?
Your Medichecks test, 8.30am and fasting, shows TSH at 1.46
Your GP test at 2pm after eating shows 0.88
So your TSH is not higher later in the day, it's lower.
This test includes both Tpo and Tg antibodies
Well, tests will be different depending on time of day, time of year, time of month for women and whether you have eaten or not, and when you took your meds. Medichecks test shows you need an increase in levo unless you feel great.