Answer
Biotin can produce falsely high or low results in some thyroid assays. Tell the clinician and laboratory about any biotin-containing supplement.
Sources for this answer
- Levothyroxine SERB 200 micrograms/ml solution for injection/infusion — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.