Which laboratory pattern is typical of primary hypothyroidism?
Answer and explanation
Correct answer: C. High TSH and low free T4
- Step 1: In primary hypothyroidism the failing thyroid produces little T4, so TSH rises.
- Step 2: Levothyroxine is the treatment.
Answer
High TSH and low free T4.
Why not the others: A low TSH with high T4 suggests hyperthyroidism, and the other patterns suggest central or other causes.
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