blood test

[Pooh10]

Hi everyone, just wondered how long you avoid supplements (D, ferratin, folate etc) pre blood test? Thanks

[helvella Administrator Thyroid UK]

Well, I can give you an answer for biotin - if you take that (or a B complex that includes it):

helvella - Biotin supplementation and testing

A short article about how and why biotin can affect blood tests. Includes information about how to avoid any problems.

helvella.blogspot.com/p/hel...

[SlowDragon Administrator]

If you are taking vitamin B complex, or any supplements containing biotin, remember to stop these 5-7 days before ALL BLOOD TESTS , as biotin can falsely affect test results

endo.confex.com/endo/2016en...

endocrinenews.endocrine.org...

In week before blood test, when you stop vitamin B complex, you might want to consider taking a separate folate supplement (eg Jarrow methyl folate 400mcg) and continue separate B12 if last B12 was still too low

Post discussing how biotin can affect test results

healthunlocked.com/thyroidu...

helvella.blogspot.com/p/hel...

Never supplement iron without doing full iron panel test for anaemia first and retest 3-4 times a year if self supplementing.

It’s possible to have low ferritin but high iron

Test early morning, only water to drink between waking and test. Avoid high iron rich dinner night before test

Stop iron supplements 5-7 days before testing

Medichecks iron panel test

medichecks.com/products/iro...

Stop any other supplements day before test

[FallingInReverse in reply to SlowDragon]

And if testing iron, even avoid eating iron-rich foods the day before.

[Ukie]

Medichecks are currently saying no B12 for two weeks prior to test.

[Pooh10]

thanks so much everyone for the helpful replies and links (I’ll read with interest later today)