Photomicrograph of urine sediment with a red cell cast
Photomicrograph of urine sediment with a red cell cast
Urine sediment showing free red cells and a red cell cast that is tightly packed with red cells. It is more common for red cell casts to have fewer red cells trapped within a hyaline or granular cast. Red cell casts are virtually diagnostic of glomerulonephritis or vasculitis.