How Urine Analyzer work

Urine analyzers are Laboratory Devices used to determine certain chemical constituents in urine. They are an important tool for automated urine inspection in medical laboratories and have the advantage of simple and fast operation. The urine Analyzer collects and analyzes the color information of various reagent blocks on the test strip under the control of the computer, and after a series of signal conversions, they finally, output the measured chemical composition contained in the urine.

Here is the content list:

l The essence of the principle.

l Application of the principle.

The essence of the principle.

The essence of the testing principle of the Urine Analyzer is the absorption and reflection of light. The liquid sample is directly added to the multi-reagent strip that has been cured with different reagents, and the corresponding chemical components in the urine make the modules containing various special reagents on the multi-reagent strip change color. The concentration of the components is proportional; the multi-band test strips are placed in the Laboratory device colorimetric injection tank, each module is illuminated by the Urine Analyzer light source in turn and produces different reflected light, and the Laboratory device receives the light signals of different intensities and convert them into corresponding The electrical signal is then calculated by the microprocessor (CPU) to calculate the reflectivity of each test item, then compared with the standard curve and corrected to the measured value, and finally the results are automatically printed out in a qualitative or semi-quantitative manner.

Application of the principle.

Such Urine analyzers are generally controlled by a computer, and the color change on the test strip is measured using a spherical integrator to receive dual-wavelength reflected light for semi-quantitative determination. There are several reagent pads with various reagents on the reagent strip. Each reagent pad reacts with the corresponding components in the urine independently and displays different colors. the depth of the color is proportional to a certain component in the urine, and there is another " Compensation pad", as the background color of urine, compensates for the error caused by the change of colored urine and Urine Analyzer. Put the urine-adsorbed reagent strip in the Laboratory device colorimetric cell, and the various reagent pads that have produced chemical reactions on the reagent strip are illuminated by the light source, the reflected light is received by the spherical analyzer, and the photocell of the spherical analyzer is reflected. The dual-wavelength light (measurement light passing through the filter and a reference light) is irradiated, and the choice of each wavelength is determined by the detection item. Urine Analyzer usually automatically calculates the reflectance according to the following formula and then compares it with the standard curve to automatically find and print the corresponding results of various components. If the content of a certain component in the urine is high, the reflected light of the corresponding reagent pad is darker, otherwise, it will power. Reflectance fractional formula: R(%)=Tm.Cs/TsCm×100%, R(%) in the fractional formula is the reflectance; Tm is the reflection intensity of the reagent pad to the measured wavelength; Ts is the reagent pad to the reference wavelength Reflection intensity; Cm is the reflection intensity of the calibration pad to the measured defect length; Cs is the reflection intensity of the calibration to the reference wavelength.

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