1. Introduction
1.1. Methodology of the urine test
The urinalysis is part of the medical diagnosis methods frequently used by medical doc-
tors in laboratories in order to reveal diseases. The most cost-effective device used to
screen urine is a reagent test strip. This microchemistry system has been available for
many years and allows qualitative or semi-quantitative analysis within one minute by sim-
ple but careful observation. The colour change occurring on each test pad of the strip is
compared to a colour chart to obtain the result. However, misreading or misinterpreting of
results, caused by individual handling habits of the user or different light conditions, may
happen. Urine analyzer (urine strip reader) equipment is designed specifically to improve
the accuracy and security of urine strip evaluation by using light and photometric reader
in order to detect the colour changes on the test strips. The CombiScan
®
500 supports
test data management and report generation by offering data storage and computerised
data processing features.
The CombiScan
®
500 is a urine analyzer for professional use. The reader is a semi-auto-
matic benchtop instrument designed to read the CombiScreen
®
11SYS reagent strips.
The operator needs only to feed the equipment by placing the moisturised strip on the
conveyor – the rest, as forwarding, reading, evaluating and disposal of the strips is done
automatically by the device. The timing (route-length and speed of the conveyor belt) is
adequate to the incubation time of the test strip.
The CombiScan
®
500 analyses the colour and intensity of the light reflected from the rea-
gent surface and reports the results in clinical meaningful units. No further calculation is
needed by the user. When a strip is moved into the measuring position under the optical
unit, the reflectance of each reagent pad is measured. The light reflected at specific wave-
lenghts from the test pad depends upon the degree of colour change of the pad, which
is related to the concentration of the particular parameter in urine. The intelligent image
analyzer software first detects, locates the strip and the pads, then, based on these colour
light-wave information the CombiScan
®
500 reads the reagent areas and the values are
calculated automatically. Results are stored, then printed out by the built-in printer and
can optionally be sent to host computer via serial connection.
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