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Clinical Chemistry 20: 436-439, 1974;
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Clinical Chemistry, Vol 20, 436-439, Copyright © 1974 by the American Association for Clinical Chemistry

Urine Microscopy, an III-Defined Method, Examined by a Multifactorial Technique

P. Winkel 1, B. E. Statland 1, and K. Jørgensen 1

1 Department of Clinical Chemistry A, Rigshospitalet, Blegdamsvej 9, DK-2100, Copenhagen, Denmark.

The precision of routine urine microscopy for counting erythrocytes and leukocytes was evaluated by using a statistical research-planning technique, factorial experimental design. We examined the relative contribution of the technician preparing the urine specimen, the technician reading the urine slide, the time elapsed since receipt of the urine specimen, and the effect of the microscope used. Results obtained by various technicians differed significantly, because of variation in preparation techniques. This study demonstrates that the routine examination of urine for cellular components may be more imprecise than generally believed, and that the technique should be better defined. It is emphasized that the technique of factorial experiments can be used as an important tool for the design of a rational quality-control program.


Key Words: statistics • multifactorial experiment • quality control • variation, source of

Submitted on December 13, 1973
Accepted on January 23, 1974




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Copyright © 1974 by the American Association for Clinical Chemistry.