Eighty percent of episodes of gross hematuria in patients with IgA nephropathy are associated with upper respiratory tract infections, primarily acute pharyngotonsillitis, as well as with gastroenteritis. In these patients, gross hematuria usually appears in the first 48-72 hours from the beginning of the infection and lasts for < 3 days.
Pigmenturia, or pseudohematuria, is caused by the presence of dyes, urinary metabolites such as porphyrins and homogentisic acid, as well as certain drugs in the urine. It is a mimicker of hematuria and can easily be confused with the presence of blood in the urine.
Learn more about the clinical presentation of IgA nephropathy.
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Cite this: A. Brent Alper. Fast Five Quiz: IgA Nephropathy Presentation and Diagnosis - Medscape - Sep 18, 2023.