Biotin and blood tests

[Eton]

Does the rule regarding avoiding biotin apply to all blood tests or just to thyroid test?

Thank you

[SlowDragon Administrator]

all tests

[Eton in reply to SlowDragon]

Thank you SD.

[helvella]

All tests which use avidin processes.

Avidin

en.wikipedia.org/wiki/Avidin

This is a lot of tests - including many non-thyroid tests. But not all tests. For example, I think standard complete blood counts are unaffected.

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 and how much biotin some foods contain.

Last updated 10/02/2025

Link to blog:

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

[Eton in reply to helvella]

Many thanks for clarifying this.