COMPONENTS & CONCENTRATION OF WORKING SOLUTION
Buffer, pH 7.8 | 15mmol/I |
Peroxidase | 100 IU/I |
Uricase | 100 IU/I |
Ascorbate oxidase | 100 IU/I |
Chromogen | 1.0 mmol/I |
SPECIMEN COLLECTION & PRESERVATION
Blood should be collected in a clean dry container. Avoid the use of plastic or siliconized container which may prolong clotting time. Serum or plasma should be separated from the cells at the earliest possible (within 30 minutes). For plasma collection following anticoagulants may be used.
In neatly separated serum or plasma, uric acid is stable for 3 days at room temperature (below 25 degree C) and for 6 months when stored at -10 degree C.
1.0 ml procedure
| Serum / Plasma | Standard | Blank |
Reagent | 0.025 ml | 0.025 ml |
|
1.0 ml | 1.0 ml | 1.0 ml |
Incubation
Incubate the assay mixture for 5 minutes at 37 degree C or 10 minutes at
R.T. (25 -30 degree C). After completion of the incubation measure the absorbance of assay mixture against blank at 510 nm. Final colour is stable for 30 minutes if not exposed to direct light.
Calculation:
With factor for wavelength range : 500 - 510 nm. Cone. (mg%) 28 x Absorbance of sample
Expected range varies from population to population. It is therefore recommended that each laboratory should establish its own normal range.
PROCEDURE LIMITATIONS
QUALITY CONTROL
To ensure adequate quality control, it is recommended that each batch should include a normal and an abnormal commercial reference control serum. It should be realised that the use of quality control material checks both instrument and reagent functions together. Factors which might affect the performance of this test include proper instrument function, temperature control, cleanliness of glassware and accuracy of pipetting.
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