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Here's some data on that for you: Testosterone - falsely high result.

Impact of Biotin Supplementation on Endocrine Lab and Clinical Diagnosis

https://www.excelmale.com/forum/threads/impact-of-biotin-supplementation-on-endocrine-lab-and-clinical-diagnosis.15859/

Impact of Biotin on Immunoassays

An excess biotin intake may adversely effect immunoassays in two different ways:

• In competitive immunoassays, excessive biotin is likely to produce a falsely high result;
• In immunometric, or sandwich assays, it may result in false low results.

For a list of common endocrine-related competitive and sandwich assays that may return inaccurate findings in the presence of biotin supplementation see Table 1.