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DescriptionUrine of patient with porphyria.png
English: Change in urine color before and after sun exposure Left figure is urine of the first day. Right figure is urine after sun exposure for 3 days. Urine color changed to “port wine” color after sun exposure. This color change is due to increased concentrations of porphyrin intermediates in the urine, indicating an abnormality in production and a partial block within the enzymatic porphyrin chain with metabolite formation. The urine color usually becomes darker with acute illness, even dark reddish or brown after sun exposure.
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A sinistra un campione di urina immediatamente prelevata, mentre a destra lo stesso campione dopo 3 giorni di esposizione al sole che mostra il classico cambiamento di colore verso il viola.