A nurse is reviewing the medical record of a client who has hyperthyroidism (Graves disease). Which of the following serum laboratory findings should the nurse expect to be below the expected reference range?
Thyroxine (T4) level
Triiodothyronine (T3) level
Thyroid stimulating hormone (TSH) level
Glucose level
The Correct Answer is C
Choice A: Thyroxine (T4) level. This is incorrect because T4 is one of the thyroid hormones that is increased in hyperthyroidism. T4 is produced by the thyroid gland and converted to T3 in the tissues. A high level of T4 indicates overactivity of the thyroid gland.1
Choice B: Triiodothyronine (T3) level. This is incorrect because T3 is another thyroid hormone that is increased in hyperthyroidism. T3 is the more active form of thyroid hormone and regulates the metabolism of cells. A high level of T3 indicates overactivity of the thyroid gland.1
Choice C: Thyroid stimulating hormone (TSH) level. This is correct because TSH is a hormone that stimulates the thyroid gland to produce T4 and T3. TSH is produced by the pituitary gland and regulated by a feedback mechanism. When the levels of T4 and T3 are high, the pituitary gland reduces the secretion of TSH to inhibit further production of thyroid hormones. Therefore, a low level of TSH indicates hyperthyroidism.1
Choice D: Glucose level. This is incorrect because glucose level is not directly related to thyroid function. However, hyperthyroidism can affect glucose metabolism and cause increased blood sugar levels due to increased breakdown of glycogen and glucose uptake by cells. Therefore, glucose level may be elevated in some cases of hyperthyroidism, but it is not a specific indicator.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Insulin injected into the thigh is not the most rapidly absorbed. The abdomen is the preferred site for insulin injection, as it has the fastest and most consistent absorption rate. The thigh, arm, and butock have slower and more variable absorption rates12.
Choice B reason: The botle of insulin should not be shaken before withdrawing the medication. Shaking can damage the insulin molecules and affect their potency and effectiveness. Instead, the botle should be gently rolled between the palms to mix the insulin evenly13.
Choice C reason: Lantus insulin should not be used immediately before each meal. Lantus is a long-acting insulin that provides a steady basal level of insulin for 24 hours. It should be taken once a day at the same time every day, regardless of meals. Humalog is a rapid-acting insulin that can be used immediately before each meal to cover the postprandial glucose spikes14.
Choice D reason: Unopened vials of insulin should be kept in the refrigerator until needed. This can help preserve their quality and potency until their expiration date. Opened vials of insulin can be kept at room temperature for up to 28 days, depending on the type and brand
Correct Answer is D
Explanation
Choice A: Both illnesses result in malabsorption of nutrients. This is incorrect because malabsorption of nutrients is more common in Crohn’s disease than in ulcerative colitis. Crohn’s disease can affect any part of the gastrointestinal tract, including the small intestine, where most of the nutrient absorption occurs. Ulcerative colitis mainly affects the colon and rectum, which are responsible for water and electrolyte absorption.
Choice B: Both illnesses begin in the rectum. This is incorrect because ulcerative colitis usually begins in the rectum and spreads proximally to the colon, while Crohn’s disease can begin anywhere in the gastrointestinal tract, from the mouth to the anus.
Choice C: Both illnesses manifest fistula formation. This is incorrect because fistula formation is more common in Crohn’s disease than in ulcerative colitis. Fistulas are abnormal connections between different parts of the gastrointestinal tract or other organs, such as the bladder, vagina, or skin. They are caused by inflammation, ulceration, and infection that penetrate through the bowel wall.
Choice D: Both illnesses are inflammatory in nature. This is correct because both ulcerative colitis and Crohn’s disease are types of inflammatory bowel disease (IBD), which are chronic conditions that cause inflammation and damage to the gastrointestinal tract. The exact cause of IBD is unknown, but it may involve genetic, immune, environmental, and microbial factors.

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