The article “Urinalysis: A Comprehensive Review” (March 15, 2005, page 1153) contained two errors. First, in the second paragraph of the right-hand column of page 1158, the time necessary for the dipstick reagent test to change color was incorrectly listed as five minutes instead of 30 seconds to two minutes. The sentence should have read as follows: “To detect significant pyuria accurately, 30 seconds to two minutes should be allowed for the dipstick reagent strip to change color, depending on the brand used.” Second, the first sentence of the second paragraph in the left-hand column on page 1160 should have read as follows: “Under high-powered magnification, gram-negative rods, streptococci, and staphylococci can be distinguished by their characteristic appearance.” The online version of this article has been corrected.