RN Nursing · Chronic Kidney Disease · Practice question
A client with CKD has pruritus (itching). The nurse understands this is likely caused by:
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Low calcium levels
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✓
Deposition of urea crystals (uremic frost) or high phosphate
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An allergic reaction to heparin
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Decreased red blood cell count
Answer & explanation
Correct: Deposition of urea crystals (uremic frost) or high phosphate
Pruritus in chronic kidney disease (CKD) is a well-recognized and distressing symptom caused primarily by the accumulation of uremic toxins — particularly urea — that deposit in the skin as uremic frost, and by elevated serum phosphate levels that trigger calcium-phosphate crystal deposition in cutaneous tissues. As kidney function declines, the body cannot adequately excrete phosphate, leading to hyperphosphatemia. Elevated phosphate binds calcium, and these deposits in the skin stimulate nerve endings, causing intense itching. Additionally, secondary hyperparathyroidism, which develops in response to low calcium and high phosphate, worsens mineral dysregulation. Low calcium levels alone do not directly cause pruritus — it is actually the elevated phosphate and uremic buildup that are responsible. An allergic reaction to heparin would present with a different clinical picture, typically urticaria or a more acute onset, and is not a chronic consequence of CKD itself. Decreased red blood cell count (anemia of CKD) causes fatigue and pallor but does not directly cause pruritus. Understanding that uremic frost and hyperphosphatemia drive CKD-related itching helps nurses educate clients about dietary phosphate restriction and the importance of phosphate binders as part of disease management.
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