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Levothyroxine monitoring after dose change — GPhC CRA MCQ

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ModerateEndocrine TherapeuticsLevothyroxine monitoring after dose changeGPhC CRA

A 61-year-old woman has her levothyroxine dose increased from 75 to 100 micrograms daily. She asks when the blood test should be repeated. What monitoring is required?

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Correct answer: C — Check TSH after about 6–8 weeks

TSH responds slowly to levothyroxine dose changes, so repeat testing is usually after several weeks. Testing the next day would not reflect steady-state effect. Other tests do not monitor thyroid replacement.

Reference: NICE CKS; BNF