The Quantitative Significance of Bacteria Visualized in the Unstained Urinary Sediment

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Abstract
EXAMINATION of uncentrifuged specimens of clean, fresh urine stained by the Gram method1 or of sediment stained with methylene blue2 have proved useful as aids in rapidly establishing the presence of urinary-tract infection. Bacteria are also readily visualized in unstained, routinely prepared urinary sediment. The value of examination of the unstained sediment for bacteria has been long known to urologists who customarily examine fresh specimens of urine. It is therefore surprising to find that only passing reference has been made to the significance of bacteria in sediment in a number of popular clinical textbooks on pathology3 4 5 and in papers concerned . . .