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Thyroid function tests are blood tests that measure hormone levels to check how well your thyroid is working. The most common tests are thyroid-stimulating hormone (TSH) and thyroxine (T4), which help ...

Correspondence to Joseph Michael Northey, Joseph Northey, University of Canberra Research Institute for Sport and Exercise, Building 29, University Drive, Bruce ACT, 2617, Australia; ...

June 24, 2026 A study of nearly 300 people across northern Britain found that vitamin D levels often stay low all year in groups most at risk. Surprisingly, summer sunshine did not significantly boost ...