Nokea
The nurse is caring for a patient who has clinical manifestations of hypothyroidism. Which of the following laboratory tests is most accurate to evaluate thyroid function?
- A. Thyroxine (T4) level
- B. Triiodothyronine (T3) level
- C. Thyroid-stimulating hormone (TSH) level
- D. Thyrotropin-releasing hormone (TRH) level
Correct Answer: C
Rationale: The most sensitive and accurate laboratory test is measurement of TSH; thus it is often recommended as a first diagnostic test for evaluation of thyroid function. A low TSH level indicates that the patient's hypothyroidism is caused by decreased anterior pituitary secretion of TSH. Low T4 and T3 levels are not diagnostic of the primary cause of the hypothyroidism. TRH levels indicate the function of the hypothalamus.
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The nurse is caring for a patient who is preparing for a growth hormone stimulation test. Which of the following adverse effects should the nurse monitor for during the test?
- A. Bradycardia
- B. Hypotension
- C. Hyperglycemia
- D. Tachypnea
Correct Answer: B
Rationale: During a growth hormone stimulation test, the nurse should continually assess for hypoglycemia and hypotension. There is no indication to monitor for bradycardia or tachypnea.
The nurse is caring for a patient who is taking spironolactone. Which of the following parameters should the nurse monitor?
- A. Decreased urinary output
- B. Evidence of fluid overload
- C. Increased serum sodium levels
- D. Elevated serum potassium levels
Correct Answer: D
Rationale: Spironolactone is a diuretic and it blocks aldosterone. Recalling that aldosterone increases the excretion of potassium, a medication that blocks aldosterone will tend to cause hyperkalemia. Aldosterone also promotes the reabsorption of sodium and water in the renal tubules, so spironolactone will tend to cause increased urine output, a decreased or normal serum sodium level, and signs of dehydration.
The nurse is caring for a patient who is scheduled for a 24-hour urine collection for 17-ketosteroids. Which of the following actions should the nurse implement?
- A. Keep the specimen on ice.
- B. Insert a retention catheter.
- C. Have the patient void and save that specimen to start the collection.
- D. Encourage the patient to drink 2-3 L of fluid during the 24 hours.
Correct Answer: A
Rationale: The specimen must be kept on ice or refrigerated until the collection is finished. Voided or catheterized specimens are acceptable for the test. The initial voided specimen is discarded. There is no fluid intake requirement for the 24-hour collection.
The nurse is evaluating the laboratory results for a patient who has increased secretion of the anterior pituitary hormones. Which of the following findings should the nurse anticipate when reviewing the laboratory findings?
- A. Decreased serum thyroxine levels
- B. Elevated serum aldosterone levels
- C. An increase in urinary free cortisol
- D. Low urinary excretion of catecholamines
Correct Answer: C
Rationale: Increased secretion of adrenocorticotropic hormone (ACTH) by the anterior pituitary gland will lead to an increase in serum and urinary cortisol levels. An increase, rather than a decrease, in thyroxine level would be expected with increased secretion of thyroid-stimulating hormone (TSH) by the anterior pituitary. Aldosterone and catecholamine levels are not controlled by the anterior pituitary.
Which of the following information about a patient who is scheduled for an oral glucose tolerance test should be reported to the health care provider before starting the test?
- A. Occasional orthostatic dizziness
- B. A 5 kg weight gain in the last month
- C. Intake of 1 L of water an hour previously
- D. Oral corticosteroid use for rheumatoid arthritis
Correct Answer: D
Rationale: Corticosteroids can affect blood glucose results. The other information will be provided to the provider but will not affect the test results.