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 Best of Five 3.97

 

   

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BOF: 3.97

A 37-year-old female undergoes radioiodine therapy for Grave’s disease. Her thyroid function tests before and after treatment are as follows:

 

Before:

Free T4: 31 pmol/L (9-22)

Total T3: 3.5 nmol/L (0.92.6)

TSH: < 0.02 mU/L (0.44)

 

2 weeks post radioiodine therapy:

Free T4: 12pmol/L

Total T3: 1.4 nmol/L

TSH> <0.02 mU/L

Why is the TSH still suppressed?

a)      Laboratory error

b)      Incomplete radio-iodine therapy

c)      Patient has been started on thyroxine

d)      Patient is still on carbimazole

e)      TSH usually takes about 6 weeks to stabilise to new level

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