Postrenal azotemia refers to:

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Study for the VTNE Laboratory Procedures Test. Use flashcards and multiple choice questions, each question offers hints and explanations, enabling increased understanding and retention. Prepare effectively for your exam!

Multiple Choice

Postrenal azotemia refers to:

Explanation:
Postrenal azotemia occurs when urine flow is blocked downstream of the kidneys. When the urine can't be excreted, pressure backs up, filtration is impaired, and nitrogenous wastes like BUN accumulate in the blood, so BUN rises. This is best described by an increase in BUN due to the inability to urinate. It differs from prerenal azotemia, which results from reduced kidney perfusion (as in dehydration or shock), and from intrinsic renal disease, where the problem lies within the kidneys themselves. Liver disease can alter BUN by changing urea production, which can lower BUN, not reflect obstruction.

Postrenal azotemia occurs when urine flow is blocked downstream of the kidneys. When the urine can't be excreted, pressure backs up, filtration is impaired, and nitrogenous wastes like BUN accumulate in the blood, so BUN rises. This is best described by an increase in BUN due to the inability to urinate. It differs from prerenal azotemia, which results from reduced kidney perfusion (as in dehydration or shock), and from intrinsic renal disease, where the problem lies within the kidneys themselves. Liver disease can alter BUN by changing urea production, which can lower BUN, not reflect obstruction.

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