Loading Calculator...
Please wait a moment
Please wait a moment
Enter your thyroid function tests for a comprehensive interpretation
Normal: 0.4 - 4.0 mIU/L
Normal: 0.8 - 1.8 ng/dL
Normal: 2.3 - 4.2 pg/mL
The most sensitive marker. High TSH = underactive thyroid. Low TSH = overactive thyroid (inverse relationship).
Main thyroid hormone. Reflects thyroid gland production. Used with TSH to determine thyroid status.
Active hormone. Helpful for T3 toxicosis or when clinical picture doesn't match T4 levels.