The blue catalase test is easy to perform and economical of materials. In a series of 529 adult female hospital patients it appeared to be a good screening test for pyuria and haematuria, detecting all but one of the specimens examined with more than 20 red and white cells combined per cubic millimetre of urine and 95·2% of those with more than 10 cells. It indicates a raised leucocyte or red cell excretion rate but is not a test for bacteriuria.
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