In Sapporo city of Japan, neonatal screening for congenital hypothyroidism has used the measurement of free thyroxine (T4) and thyroid-stimulating hormone (TSH) in the filter-paper blood spot. This ...

Dear Dr. Roach: I am 57 and just starting menopause. I was on birth-control pills for 40 years. I currently take no medications. My TSH level is slightly elevated (5.50) under the new standards. T3 ...

Thyroxine (T4) levels differ from person to person but usually exist within a consistent range. Abnormal T4 levels can lead to various symptoms and complications, including mental health and digestive ...