[Rapid demonstration of urinary leucocytes with a new leucocyte test-strip. A multicentre cooperative study (author's transl)].

In a study in which eight centres from Austria, France, Germany and Switzerland cooperated anew test-strip for urinary leucocytes was compared with chamber counts of uncentrifuged urine, on a total of 3183 urine samples. There was good agreement between the teststrip and reference test as to sensitivity and clinical significance, and no significant difference to the Cytur-Test, which is already commercially available. However, one advantage of the new test is that the reaction time is shortened to one minute, so that it can be used in combination test-strips (Combur-Test), thus providing uniform reading-off time and measurement by reflexion-photometry. There is no interference by ascorbic acid, but albumin and serum proteins in higher concentrations weaken the colour reaction. Urine-preserving formaldehyde-containing additives produce false-positive reactions. Alpha-methyldopa, salicylic acid, beta-hydroxybutyric acid and acetoacetic acid have no influence.