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Scand J Clin Lab Invest. 1980 May;40(3):259-61.

Falsely negative urinary leucocyte counts due to delayed examination.

Abstract

Microscopic examination for urinary leucocytes was performed in the ward immediately after micturition and approximately 3 h later at a laboratory. Of the forty-eight specimens classified as positive by counting in the ward, 35% erroneously turned up negative by later counting at the laboratory. Counting of urinary leucocytes should consequently be performed as soon as possible after micturition, probably within 1 h.

PMID:
7444343
[Indexed for MEDLINE]

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