Understand your thyroid function with a simple blood test at Randox Health. Weight fluctuation, trouble sleeping and sensitivity to heat or cold can all be indicative of a thyroid disorder. We test for 5 key markers to give you a comprehensive overview of your thyroid health. Home sample collection Thyroid Stimulating Hormone, Free T4, Free T3, Anti-TG, Anti-TPO Results in 2-5 working days from receipt of sample at lab