What Is a Low TSH Level in a Woman?
TSH below 0.4 mIU/L is low. Women have unique causes.
Pregnancy Ranges
- T1: 0.1–2.5
- T2: 0.2–3.0
- T3: 0.3–3.0
Causes in Women
- Pregnancy (hCG effect)
- Postpartum thyroiditis
- PCOS
- Graves’ disease
- Overtreated hypothyroidism
When to Treat
- Symptomatic — yes
- Subclinical — depends on TSH and pregnancy plans
Source: American Thyroid Association, NLM MedlinePlus.
Order a TSH lab test online — private, no specialist referral required.
Order a TSH lab test online ↗ affiliate link