Is it safe to discontinue prenatal vitamins that contain biotin for a few days during pregnancy when labs in particular thyroid tests are planned for treating hypo or hyperthyroidism in pregnancy?

Biotin doses of 5-10 mg can impact TFTs. Most prenatal vitamins contain 30-35 mcg of biotin (although there are some that contain up to 500 mcg of biotin). This is usually too low to cause assay interference, so I do not recommend cessation of prenatal vitamins prior to TFTs (although I will ask tha...

The quantity of Biotin is too small to cause any impact on thyroid tests.