How Is Hypothyroidism Diagnosed?
Diagnosed through blood tests.
Criteria
- TSH above 4.0
- Free T4 below normal
- Anti-TPO positive = Hashimoto's
Steps
- TSH screening
- Free T4 to confirm
- Antibodies for cause
- Repeat 3+ months
Subclinical vs Overt
- Subclinical: TSH 4-10, normal T4
- Overt: TSH above 10, low T4
Source: American Thyroid Association, NLM MedlinePlus.
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