TSH: Screening for Thyroid Function
The primary test for identifying hypothyroidism and hyperthyroidism.
For Informational Purposes Only
This content is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for any medical concerns.
Guide Overview & Important Ranges
TSH is produced by the pituitary gland. It tells your thyroid how much hormone to make. It is the most sensitive test for thyroid issues.
0.4 to 4.0 mIU/L
Normal Range
Hypothyroidism
High TSH
Hyperthyroidism
Low TSH
Not Required
Fasting?
Medical Deep Dive
Understanding TSH Results
High TSH: Means your thyroid is underactive. Your brain is "screaming" at it to work harder (Hypothyroidism).
Low TSH: Means your thyroid is overactive. Your brain has "stopped asking" for more hormone (Hyperthyroidism).
If TSH is abnormal, doctors often test Free T4 and Free T3 for a complete picture.
Thyroid Check
Is your metabolism in balance? Let AI explain your TSH.
Scientific References
This information is based on established clinical guidelines from authoritative sources.
Medically Reviewed for Accuracy
This content is aligned with established clinical guidelines from authoritative medical institutions, including MedlinePlus, the CDC, and the NHS.
BodyWellness AI uses a structured clinical logic framework to present this information clearly and safely.