• Thyroid optimisation support: Addressing fatigue, low mood, weight changes, or concentration issues despite normal thyroid labs.
• Thyroid medication enhancement: Improving persistent symptoms on levothyroxine or similar therapies.
• Cold sensitivity management: Targeting unexplained low energy or temperature intolerance.
• Thyroid activation insights: Exploring T4 to active T3 conversion differences.
• Familial thyroid evaluation: Assessing inherited influences on thyroid function.

Overview

DNA DIO2 examines genetic variation in the enzyme responsible for converting thyroid hormone T4 into its active form, T3, within body tissues. This process plays an important role in regulating energy metabolism, neurological function and overall physiological balance.

Differences in DIO2 activity may affect how thyroid hormone is activated in organs such as the brain and skeletal muscle. This may help explain persistent symptoms, reduced response to T4 therapy or variable overall treatment response in individuals whose routine thyroid blood tests appear within reference ranges.

Results are considered alongside symptom history, thyroid function results and current treatment approaches. Reviewing genetic findings in this clinical context can support more informed discussion around monitoring, medication use and ongoing thyroid health management.

Practical

Sample required:

Buccal swab

Average processing time:

18-21 days

Research

V Panicker, P Saravanan, B Vaidya, J Evans, A Hattersley, T Frayling & C Dayan., 'Common Variation in the DIO2 Gene Predicts Baseline Psychological Well-Being and Response to Combination Thyroxine Plus Triiodothyronine Therapy in Hypothyroid Patients', Journal of Clinical Endocrinology and Metabolism, 2009, 94(5): 1623- 1629.