Which urinary cast type is often clear and may be seen with proteinuria, despite being relatively protein-poor?

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Multiple Choice

Which urinary cast type is often clear and may be seen with proteinuria, despite being relatively protein-poor?

Urinary casts reflect what’s happening in the tubules, and the most common type is the hyaline cast. These are formed mainly from Tamm-Horsfall protein and appear colorless and clear under the microscope, with very little cellular material. Because they’re relatively protein-poor, they can be seen even when proteinuria isn’t heavy, especially in concentrated urine or during physiologic stress. Hyaline casts are commonly seen in dehydration, fever, or mild proteinuria, making them a frequent, non-specific finding. In contrast, red blood cell casts indicate bleeding within the glomeruli, and white blood cell casts point to tubular inflammation or infection; mucus threads aren’t true casts. So the clear, relatively protein-poor cast that can accompany proteinuria is the hyaline cast.

Urinary casts reflect what’s happening in the tubules, and the most common type is the hyaline cast. These are formed mainly from Tamm-Horsfall protein and appear colorless and clear under the microscope, with very little cellular material. Because they’re relatively protein-poor, they can be seen even when proteinuria isn’t heavy, especially in concentrated urine or during physiologic stress. Hyaline casts are commonly seen in dehydration, fever, or mild proteinuria, making them a frequent, non-specific finding. In contrast, red blood cell casts indicate bleeding within the glomeruli, and white blood cell casts point to tubular inflammation or infection; mucus threads aren’t true casts. So the clear, relatively protein-poor cast that can accompany proteinuria is the hyaline cast.

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