Thyroid
TSH
Normal Range:0.4-4 mIU/L
Optimal Range:1-2.5 mIU/L
What is TSH?
Thyroid Stimulating Hormone (TSH) is produced by your pituitary gland and signals your thyroid to produce hormones. It's the primary screening test for thyroid function.
Why TSH Matters
TSH is inversely related to thyroid hormone levels—high TSH often indicates an underactive thyroid, while low TSH may suggest an overactive thyroid. Both affect metabolism, energy, and mood.
Symptoms of Low TSH
- Weight loss
- Rapid heartbeat
- Anxiety
- Tremors
- Heat intolerance
- Insomnia
Symptoms of High TSH
- Weight gain
- Fatigue
- Cold intolerance
- Depression
- Dry skin
- Constipation
Reference Ranges
| Range Type | Minimum | Maximum | Unit |
|---|---|---|---|
| Normal Range | 0.4 | 4 | mIU/L |
| Optimal Range | 1 | 2.5 | mIU/L |