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JAMA. 1926;86(12):825-828. doi:10.1001/jama.1926.02670380015008.
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In the past, we have usually associated the term hematuria with the variety in which the urine was visibly blood-tinged or contained clots. With the rapid increase of the number of life insurance and periodic health examinations, the significance of even microscopic hematuria has assumed a different aspect. For years, urologists have emphasized the importance of a thorough examination in every case of macroscopic hematuria; and although this cannot be too strongly urged today, the possibility of recognizing a bleeding nephritis, a ureteral stricture and other symptoms has made it vital to regard even the microscopic presence of blood in the urine as worthy of a painstaking search for its seat.

During the last decade, much light has been thrown on some hitherto obscure causes of hematuria, and my special object in this paper is to review these contributions and to attempt to correlate the various portions of a question


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