STEVE HORRELL / SCIENCE PHOTO LIBRARY STEVE HORRELL / SCIENCE PHOTO LIBRARY
Urine testing. Unopened urine test strip for urinary tract infection (UTI) screening. The strip has been fixed with a reagent which changes colour according to the amount of nitrites in the urine. An excessive amount of nitrites suggests that there is a UTI because this indicates the presence of bacteria which convert nitrate to nitrite.
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