Which urinary sediment element is typically a clear, colorless cast composed mainly of Tamm-Horsfall protein?

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Multiple Choice

Which urinary sediment element is typically a clear, colorless cast composed mainly of Tamm-Horsfall protein?

Hyaline casts are the clear, colorless urinary casts formed mainly from Tamm-Horsfall protein (uromodulin) produced by tubular cells. They’re the simplest and most common type of cast and can be seen even in normal urine; they become more noticeable when urine flow is reduced, such as during dehydration, fever, diuresis, or strenuous exercise. Because they are largely protein with little or no cellular material, they appear transparent. In contrast, red blood cell casts indicate bleeding within the nephron or glomerular disease, white blood cell casts signal tubulointerstitial inflammation or infection, and granular casts reflect degenerated cellular material or protein from tubular injury, none of which are simply clear protein casts.

Hyaline casts are the clear, colorless urinary casts formed mainly from Tamm-Horsfall protein (uromodulin) produced by tubular cells. They’re the simplest and most common type of cast and can be seen even in normal urine; they become more noticeable when urine flow is reduced, such as during dehydration, fever, diuresis, or strenuous exercise. Because they are largely protein with little or no cellular material, they appear transparent. In contrast, red blood cell casts indicate bleeding within the nephron or glomerular disease, white blood cell casts signal tubulointerstitial inflammation or infection, and granular casts reflect degenerated cellular material or protein from tubular injury, none of which are simply clear protein casts.

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