A patient presents to the clinic with complaints of suprapubic discomfort and problems with urination. After reviewing her lab results, you notice that her creatinine and BUN (Blood Urea Nitrogen) levels are elevated. What do these elevated levels indicate?
Vitamin D deficiency
Dehydration or kidney dysfunction
Respiratory acidosis
Liver failure or cirrhosis
The Correct Answer is B
Choice A reason: Vitamin D deficiency affects calcium and bone health, not creatinine or BUN levels, which reflect kidney function. Elevated BUN and creatinine point to dehydration or kidney issues, so this is incorrect for the lab findings.
Choice B reason: Elevated creatinine and BUN indicate dehydration or kidney dysfunction, as these markers rise when kidneys fail to clear waste or when blood volume is low. This matches the patient’s symptoms, making it the correct choice.
Choice C reason: Respiratory acidosis affects blood pH and CO2, not creatinine or BUN, which are renal markers. Kidney dysfunction or dehydration better explain the lab results, so this is incorrect for the findings.
Choice D reason: Liver failure may elevate other markers (e.g., bilirubin), but BUN and creatinine are kidney-specific. Dehydration or kidney dysfunction align with the labs and symptoms, so this is incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Thrombocytopenia is a low platelet count (<150,000/mm³), not >100,000/mm³, which may still be normal or low-normal. A count <150,000 defines the condition, so this is incorrect.
Choice B reason: Thrombocytopenia is defined as a platelet count less than 150,000/mm³, increasing bleeding risk. This accurately describes the condition, making it the correct choice for the definition.
Choice C reason: Thrombocytopenia causes bleeding, not increased clotting, due to low platelets. Clotting issues arise from high platelets, so this is incorrect for thrombocytopenia’s effects.
Choice D reason: Thrombocytopenia results from decreased platelet production or increased destruction, not increased production. Low platelet count defines it, so this is incorrect for the cause.
Correct Answer is A
Explanation
Choice A reason: T cells, including cytotoxic and helper T cells, drive cell-mediated immunity by directly attacking infected cells and coordinating immune responses. They target intracellular pathogens and tumors, forming the core of cellular immunity, making this the correct choice.
Choice B reason: B cells mediate humoral immunity, producing antibodies against extracellular pathogens. While critical for immune defense, they do not directly drive cell-mediated responses, which rely on T-cell activity, making this incorrect for cell-mediated immunity.
Choice C reason: “None of the above” is incorrect, as T cells play a central role in cell-mediated immunity. Their functions, like cytotoxicity and cytokine production, are essential for this immune response, making this an invalid choice.
Choice D reason: “All of the above” is incorrect, as only T cells, not B cells, are primarily responsible for cell-mediated immunity. B cells support humoral immunity, not the cellular response driven by T cells, making this an incorrect choice.
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