In hyperthyroidism, which of the following changes would you expect in plasma/serum analytes?

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Multiple Choice

In hyperthyroidism, which of the following changes would you expect in plasma/serum analytes?

In hyperthyroidism, the body is exposed to excess thyroid hormone, which drives up the level of free T4 in the blood and suppresses the pituitary’s production of TSH through negative feedback. That immediate pattern—high FT4 with low TSH—is a hallmark of this condition. Thyroid hormone also speeds up many metabolic processes, including lipid metabolism. This tends to lower circulating cholesterol, so total cholesterol levels drop. CSF protein isn’t a primary diagnostic marker for thyroid status, but in the context of a hypermetabolic state, shifts in protein turnover can result in changes such as a decrease in CSF protein levels. So the combination of increased FT4, decreased TSH, and decreased cholesterol best matches the hyperthyroid state.

In hyperthyroidism, the body is exposed to excess thyroid hormone, which drives up the level of free T4 in the blood and suppresses the pituitary’s production of TSH through negative feedback. That immediate pattern—high FT4 with low TSH—is a hallmark of this condition.

Thyroid hormone also speeds up many metabolic processes, including lipid metabolism. This tends to lower circulating cholesterol, so total cholesterol levels drop.

CSF protein isn’t a primary diagnostic marker for thyroid status, but in the context of a hypermetabolic state, shifts in protein turnover can result in changes such as a decrease in CSF protein levels.

So the combination of increased FT4, decreased TSH, and decreased cholesterol best matches the hyperthyroid state.

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