oa South African Medical Journal - An investigation into the persistence of pus in the urine
Infection of the urinary tract is recognised best by the presence of pus cells in the urine. In acid and neutral urines the pus cells survive in good condition for at least two days and probably much longer. In alkaline urine the pus cells disintegrate with much more rapidity, but generally survive for 24 hours, approximately. Here the urine should either be examined immediately or otherwise preserved in a refrigerator. In some types of highly alkaline urine associated with slimy mucus, even immediate examination microscopically may reveal pus cells already in an extreme state of disintegration, recognised duly with difficulty.
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