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Previous Volume 356:2006-2007 May 10, 2007 Number 19 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: With regard to the Image in Clinical Medicine by McStay and Gordon (Feb. 8 issue),¹ the presence of urine fluorescence can be short lived, less than 4 hours from the time of ingestion.² This brief duration poses the potential for false negative results. Not all brands of antifreeze contain fluorescein as a colorant for the detection of radiator leaks. Other researchers have reported that urine specimens from children may fluoresce without an exposure to antifreeze.^3,4 A database lists 148 substances, including a number of drugs, food products, toxins, and endogenous compounds, that can contribute to urine fluorescence . . . [Full Text of this Article]

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