A nurse is reviewing laboratory values for a client who has systemic lupus erythematosus (SLE). Which of the following values should give the nurse the best indication of the client's renal function?
Serum creatinine
Serum sodium
Blood urea nitrogen (BUN)
Urine-specific gravity
The Correct Answer is A
Choice A rationale:
Serum creatinine is a waste product that is produced by muscle metabolism and is normally excreted by the kidneys.
When kidney function is impaired, creatinine levels in the blood increase, making it a sensitive and specific indicator of renal function.
It is considered one of the most reliable markers for assessing kidney function and is routinely used to screen for and monitor kidney disease.
Choice B rationale:
Serum sodium is an electrolyte that is regulated by the kidneys, but it is not a direct measure of renal function. Sodium levels can be affected by various factors, including fluid intake, medications, and hormonal imbalances.
While abnormal sodium levels can sometimes be a sign of kidney dysfunction, they can also occur due to other conditions, making it less specific as an indicator of renal function.
Choice C rationale:
Blood urea nitrogen (BUN) is another waste product that is produced by the breakdown of proteins and is normally excreted by the kidneys.
However, BUN levels can be influenced by factors other than kidney function, such as dietary protein intake, dehydration, and gastrointestinal bleeding.
This makes BUN less specific than serum creatinine as a marker of renal function.
Choice D rationale:
Urine-specific gravity measures the concentration of solutes in urine, which can provide some information about kidney function.
However, it is not as sensitive or specific as serum creatinine.
Urine-specific gravity can be affected by factors such as fluid intake and hydration status, which can make it less reliable as an indicator of renal function.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Anorexia nervosa is a condition characterized by severe weight loss and malnutrition. People with anorexia nervosa are often deficient in nutrients, including purines. Purines are broken down in the body to produce uric acid. When there is an excess of purines in the body, uric acid levels can rise, leading to gout.
Choice B is incorrect. While consuming foods low in purines can help to prevent gout attacks, it is not a risk factor for developing gout.
Choice C is incorrect. Children are not at risk for developing gout. Gout is more common in adults, especially men.
Choice D is incorrect. Ulcerative colitis is an inflammatory bowel disease that is not associated with an increased risk of gout.
Correct Answer is A
Explanation
Choice A rationale:
Hydroxychloroquine can cause a rare but serious side effect called bone marrow suppression. This is a decrease in the production of blood cells in the bone marrow.
White blood cells (WBCs) are a key component of the immune system, and a decrease in WBCs can make a patient more susceptible to infections.
Therefore, it's crucial for nurses to monitor the patient's WBC count to detect any potential bone marrow suppression early and take necessary actions to prevent or manage infections.
Choice B rationale:
An increased blood cell count is not a typical side effect of hydroxychloroquine.
Some conditions, like polycythemia vera, can cause an increase in blood cell count, but they are not related to hydroxychloroquine use.
Choice C rationale:
While hydroxychloroquine can sometimes cause a decrease in platelet count, it's less common than bone marrow suppression affecting WBCs.
However, it's still essential for nurses to monitor platelet counts as well, as a significantly low platelet count can impair blood clotting and increase the risk of bleeding.
Choice D rationale:
Hydroxychloroquine does not typically affect red blood cell (RBC) counts.
Conditions that affect RBC counts, such as anemia, are not directly related to hydroxychloroquine use.
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