Which urine test provides the most accurate measurement of renal function?
Specific gravity
Creatinine
Phosphates
BUN
The Correct Answer is B
A. Specific gravity: Specific gravity measures urine concentration but does not directly assess renal function.
B. Creatinine: Serum creatinine levels provide the most accurate measure of renal function as they reflect the kidney’s ability to filter waste.
C. Phosphates: Phosphate levels are affected by kidney function but are not the most direct measure.
D. BUN: Blood Urea Nitrogen (BUN) can be affected by other factors like hydration and protein intake, making it less reliable than creatinine.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Blood volume decreases: While fluid imbalances are common in renal failure, the oliguric stage is marked by fluid retention, not decreased blood volume.
B. Blood urea nitrogen (BUN) level rises: The oliguric stage is characterized by reduced urine output, leading to waste product accumulation, including elevated BUN levels.
C. Urine osmolality increases: In renal failure, urine osmolality may remain low or not reflect changes due to impaired kidney function.
D. Serum calcium increases: Serum calcium often decreases in renal failure due to disturbances in vitamin D metabolism and phosphate retention.
Correct Answer is B
Explanation
A. Check for edema of the legs and ankles: Edema is not a common complication of lithotripsy. Monitoring for stone fragments and urinary symptoms is more relevant.
B. Watch for stone debris in the urine in 1 to 4 weeks: Lithotripsy fragments stones, and the patient is expected to pass debris in the urine for several weeks post-procedure.
C. Remain on restricted activity for a week: Patients can usually resume normal activity shortly after lithotripsy unless otherwise instructed.
D. Decrease fluid intake to 1000 mL/day: Increased fluid intake is encouraged to help flush out stone fragments and reduce the risk of recurrence.
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