hyaline casts

• Casts are clusters of urinary sediment elements
• (red blood cells, white blood cells, fat bodies, etc.) wrapped in a protein matrix.
• Cast formation necessarily occurs in the kidney tubules,
• and the the contents of the casts indicate the nature of the abnormalities occurring in the kidney itself.
• Hyaline casts are the only casts that should be observed in normal urine and are not of particular clinical interest.
• They can be observed after intense exercise, in very concentrated low-volume urine, or during diuretic treatment.