Thyroid Function Index Panel Calculator
TSH (mIU per L) Free T4 (ng per dL) Thyroid Function Index Panel Explanation and Clinical Context The Thyroid Function Index is an integrated measure that combines serum TSH and free T4 to provide a more stable and physiologically relevant indicator of thyroid status. TSH alone can fluctuate because of pituitary dynamics and non thyroidal influences while free T4 may remain within reference intervals in early thyroid