How much biotin will affect a thyroid test? In conclusion, the ingestion of 20 mg or more of biotin may lead to a clinically relevant thyroid assay interference. The clinicians must take this point in consideration before assessing the results of any thyroid function tests.
How much does biotin affect TSH levels? Two hours after ceasing 5 mg biotin, the levels of free T4, total T3, anti-TPO, anti-Tg, and anti-TSHR significantly increased (all P < . 001), while the level of TSH significantly decreased (P = . 005). Will 30 mcg of biotin affect thyroid tests? Biotin doses in standard multivitamin preparations (~30 mcg) are unlikely to impact lab tests. 3 However, supplements can have up to 650 times the recommended daily intake of biotin.
How Can Biotin Affect Thyroid Tests
Most commonly, biotin use can result in falsely high levels of T4 and T3 and falsely low levels of TSH, leading to either a wrong diagnosis of hyperthyroidism or that the thyroid hormone dose is too high.
How long should you stop taking biotin before thyroid test?
The ATA has recommended that patients stop taking biotin for at least 2 days before thyroid testing to avoid the risk of having a misleading test.
How long should I stop taking biotin before blood test?
Your health care practitioner may advise you to discontinue taking biotin supplements a few days before having lab tests done. If you are prescribed biotin for medical reasons, you should follow the directions of your health care practitioner.
What vitamins can affect thyroid test results?
Biotin supplements, for example, can interfere with thyroid function tests by showing falsely low TSH levels. The ATA recommends you stop taking biotin for at least two days before a thyroid test to avoid misleading results.
Which blood tests does biotin affect?
Most of the published research on biotin interference covers hormone tests, such as parathyroid hormone (PTH), thyroid stimulating hormone (TSH), T4 and T3 tests, as well as tests for troponin. However, because biotin is used in so many immunoassays, scientists say it could interfere with many others.
Does biotin interact with levothyroxine?
No interactions were found between biotin and levothyroxine.
What supplements affect TSH levels?
A study published in 2018 in the Indian Journal of Endocrinology and Metabolism found that vitamin D supplements improved TSH levels in subjects with hypothyroidism as well as thyroid antibodies in people with autoimmune thyroiditis. You can get vitamin D from fortified milk, yogurt, and orange juice.