A nurse is assessing a client who has Graves’ disease and recently diagnosed with hyperthyroidism. With the negative feedback loop mechanism in mind, the nurse should expect which of the following baseline laboratory results for this client?

Choice A reason: In Graves’ disease, T3 levels are elevated due to autoimmune stimulation of the thyroid, increasing hormone production. The negative feedback loop does not suppress T3 in hyperthyroidism, making decreased T3 incorrect for this client’s baseline results. Choice B reason: Graves’ disease involves increased thyroid-stimulating immunoglobulins (TSI), which mimic TSH and stimulate thyroid hormone production. Decreased TSI is not expected, as high TSI drives hyperthyroidism, making this choice incorrect for the client’s condition. Choice C reason: Thyroxine (T4) levels are elevated in Graves’ disease due to excessive thyroid hormone synthesis. The negative feedback loop fails to suppress T4 in hyperthyroidism, making decreased T4 incorrect for the baseline laboratory results. Choice D reason: In Graves’ disease, elevated T3 and T4 suppress TSH via the negative feedback loop, as the pituitary senses excess thyroid hormones. Decreased TSH is a hallmark of hyperthyroidism, making this the correct expected laboratory result for this client.