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T3 Uptake is a test that measures the binding capacity of thyroid hormone binding proteins in the blood. This test can help assess thyroid function.

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iollo markers that associate with T3 Uptake

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Phenylalanine

Phenylalanine is converted to tyrosine, which is needed for thyroid hormone synthesis. Altered phenylalanine metabolism could affect T3 uptake.
Lorena Tedeschi, Cristina Vassalle, Giorgio Iervasi, and Laura Sabatino. “Main Factors Involved in Thyroid Hormone Action”. ncbi-nlm-nih-gov/pmc/articles/PMC8658769/ (2021). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8658769/Unspecified. “Effects of Dietary Phenylalanine and Tyrosine on Circulating Thyroid Hormone Concentrations and Growth in Chicks”. sciencedirect.com/science/article/pii/S0022316623278736 (Unspecified). https://www.sciencedirect.com/science/article/pii/S0022316623278736Unspecified. “Physiology, Thyroid Hormone”. ncbi-nlm-nih-gov/books/NBK500006/ (2023). https://www.ncbi.nlm.nih.gov/books/NBK500006/

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Tyrosine

Tyrosine is required for the synthesis of thyroid hormones T3 and T4. Changes in tyrosine levels may impact thyroid function and T3 uptake.
Gozu H, Yildiz ME, Akalin NS. Hypothyroidism Information | Mount Sinai - New York. Ann Endocrinol (Paris) (2014). https://www.mountsinai.org/health-library/condition/hypothyroidismKatie Wilkinson. L-Tyrosine and Hypothyroidism - Paloma Health. Paloma Health (2024). https://www.palomahealth.com/supplements/l-tyrosine-hypothyroidismVA.gov. HYPOTHYROIDISM. VA.gov (2020). https://www.va.gov/WHOLEHEALTHLIBRARY/docs/Hypothyroidism.pdfRupa Health. L-Tyrosine Supplementation: Supporting Thyroid Health and … Rupa Health (2024). https://www.rupahealth.com/post/l-tyrosine-supplementation-supporting-thyroid-health-and-adrenal-function