What Is a TSH Blood Test For?
A TSH test screens for thyroid dysfunction by measuring Thyroid-Stimulating Hormone.
Why It's the Best Screening Test
- Most sensitive — detects dysfunction before T4 changes
- Simple blood draw, no fasting needed
What Results Mean
- High TSH = hypothyroidism (underactive)
- Low TSH = hyperthyroidism (overactive)
- Normal = thyroid function is normal
When to Get Tested
- Symptoms: fatigue, weight changes, cold/heat intolerance
- Family history of thyroid disease
- Pregnancy planning
- Routine: every 5 years from age 35
Source: NLM MedlinePlus, American Association for Clinical Chemistry.
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