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| Catalog # | Availability | Size | Quantity | Unit Price | Save For Later Wish List | |
|---|---|---|---|---|---|---|
| EKCA1014-1 | 2 weeks | 96 T | call |
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| Name | C-Reactive Protein (CRP) ELISA Kit | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| INTENDED USE | The Calbiotech, Inc. (CBI) C-Reactive Protein Ultra Sensitive ELISA Kit is intended for the quantitative determination of C-reactive protein (CRP) in human serum or plasma. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SUMMARY AND EXPLANATION | C-Reactive protein (CRP) is an alpha globulin with a molecular mass of approximately 110,000 to 140,000 daltons, and is composed of five identical subunits, which are noncovalently assembled as a cyclic pentamer. CRP is synthesized in the liver and is normally present as a trace constituent of serum or plasma at levels less than 0.3 mg/dl. CRP is one of the acute-phase proteins, the serum or plasma levels of which rise during general, nonspecific response to a wide variety of diseases. Although the detection of elevated levels of CRP in the serum is not specific for any particular disease, it is a useful indicator of inflammatory processes. Additionally, measurement of CRP by high-sensitivity CRP assays may add to the predictive value of other cardiac markers (myoglobin, creatine-kinase-MB, troponin I and T), which are used to assess the risk of cardiovascular and peripheral vascular disease. Inflammation in the arteries may play a role in heart disease and HS-CRP can determine heart disease risk in those with undetected heart disease and risk of complications for those who have already had a heart event Principle of the Assay The CRP ELISA kit is a solid phase direct sandwich method. The samples and anti-CRP-HRP conjugate are added to the wells coated with MAb to CRP. CRP in the patient’s serum binds to anti-CRP MAb on the well and the anti-CRP second antibody then binds to CRP. Unbound protein and HRP conjugate are washed off by wash buffer. Upon the addition of the substrate, the intensity of color is proportional to the concentration of CRP in the samples. A standard curve is prepared relating color intensity to the concentration of the CRP
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| MATERIALS NOT PROVIDED | Distilled or deionized water Precision pipettes Disposable pipette tips ELISA reader capable of reading absorbance at 450nm Absorbance paper or paper towel Graph paper | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| STORAGE AND STABILITY | 1. Store the kit at 2 - 8 C. Keep microwells sealed in a dry bag with desiccants. The reagents are stable until expiration of the kit. Do not expose test reagents to heat, sun, or strong light. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| WARNINGS AND PRECAUTIONS | 1. Potential biohazardous materials: The calibrator and controls contain human source components which have been tested and found non-reactive for hepatitis B surface antigen as well as HIV antibody with FDA licensed reagents. However, there is no test method that can offer complete assurance that HIV, Hepatitis B virus or other infectious agents are absent. These reagents should be handled at the Biosafety Level 2, as recommended in the Centers for Disease Control/National Institutes of Health manual, "Biosafety in Microbiological and Biomedical Laboratories" 1984. 2. Do not pipette by mouth. Do not smoke, eat, or drink in the areas in which specimens or kit reagents are handled. The components in this kit are intended for use as an integral unit. The components of different lots should not be mixed. It is recommended that standards, control and serum samples be run in duplicate. Optimal results will be obtained by strict adherence to this protocol. Accurate and precise pipetting, as well as following the exact time and temperature requirements prescribed are essential. Any deviation from this may yield invalid data. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SPECIMEN COLLECTION HANDLING | Collect blood specimens and separate the serum immediately. Specimens may be stored refrigerated at (2-8 C) for 5 days. If storage time exceeds 5 days, store frozen at (-20 C) for up to one month. Avoid multiple freeze-thaw cycles. Prior to assay, frozen sera should be completely thawed and mixed well. Do not use grossly lipemic specimens. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| REAGENTS PREPARATION | 1X Wash Buffer: Prepare 1X Wash buffer by adding the contents of the bottle (25 ml, 20X) to 475 ml of distilled or deionized water. Store at room temperature (20-25C). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ASSAY PROCEDURE | Prior to assay, allow reagents to stand at room temperature (20-25C). Gently mix all reagents before use. Place the desired number of coated strips into the holder Dilute patient samples and controls 1:100 by adding 5 µl of samples to 495 µl of sample Diluent (STANDARDS ARE READY TO USE). Dispense 10 L of standard, diluted samples and controls into the appropriate wells Add 100 l of enzyme conjugate to all wells. Tap the holder to remove air bubbles from the liquid and mix well. Incubate for 60 minutes at room temperature (20-25C). Remove liquid from all wells. Wash wells three times with 300 l of 1X wash buffer. Blot on absorbent paper towels. Add 100 l of TMB substrate to all wells. Incubate for 15 minutes at room temperature. Add 50 l of stop solution to all wells. Shake the plate gently to mix the solution. Read absorbance on ELISA Reader at 450 nm within 15 minutes after adding the stopping solution. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| CALCULATION OF RESULTS | The standard curve is constructed as follows: Check CRP standard value on each standard vial. This value might vary from lot to lot. Make sure you check the value on every kit. See example of the standard attached. To construct the standard curve, plot the absorbance for the CRP standards (vertical axis) versus the CRP standard concentrations (horizontal axis) on a linear graph paper. Draw the best curve through the points. Read the absorbance for controls and each unknown sample from the curve. Record the value for each control or unknown sample. The obtained values of the patient samples and control sera should be multiplied by the dilution factor of 100 to obtain CRP results in mg/l. Patient samples with CRP concentrations greater than 10 mg/l should be further diluted 10-fold after the initial 100-fold dilution (total dilution 1:1,000), and the final CRP values should be multiplied by 1,000 to obtain CRP results in mg/l. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Example of a standard Curve |
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| LIMITATIONS OF THE TEST | The test results obtained using this kit serve only as an aid to diagnosis and should be interpreted in relation to the patient’s history, physical findings and other diagnostic procedures. Do not use sodium azide as preservative. Sodium azide inhibits HRP enzyme activities. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| EXPECTED VALUES | It is recommended that each laboratory establish its own normal range based on the patient population. However, based on published literature healthy individuals are expected to have CRP values as follows: the CRP level in normal human serum ranges from 0.2 to 10 mg/L, where 90% of apparently healthy individuals have CRP levels <3 mg/L and only 1% have levels >10 mg/L. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| PERFORMANCE CHARACTERISTICS | Correlation with a Reference ELISA kit: A total of 84 sera were tested by this ELISA and a reference ELISA kit. Results were as follows:
Precision Intra-Assay
Inter-assay
Recovery Known quantities of CRP were added to a serum that contained a low concentration of CRP.
Linearity Two different patient samples were diluted with the “0” calibrator to 1:2, 1:4 and 1:8. CRP values were assayed and results were corrected with the dilution factor. The results of these dilution tests are as follows:
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| REFERENCES | Schultz, D.R., and Arnold P.I.: “Properties of four acute phase proteins: C-reactive protein, serum amyloid A protein, glycoprotein, and fibrinogen.” Seminars in Arthritis and Rheumatism 20: 129-147, 1990. Kindmark, C.O.: The Concentration of C-reactive protein in Sera from Healthy Individuals. Scand J Clin Lab Invest, 29: 407- 411, 1972. Dowling, P., and Cook, S.: Immune events in demyelinating disease. In Wolfgang, F., Ellison, G.W., Stevens J.G., and Andrew, J.M. (eds.): Multiple sclerosis. Academic Press Inc., New York, 269-277, 1972. Yudkin, J.S., et. al.: C-Reactive Protein in Healthy Subjects: Association with Obesity, Insulin Resistance, and endothelial dysfunction. A potential role for cytokines originating from adipose tissue? Arterioscler Thromb Vasc Biol 19:972-8, 1999. Kushner, I., Rzewnicki, D.L.: The acute phase response: General aspects. Bailliere’s Clinical Rheumatology 8: 513-530, 1994. Macy, E.M., Hayes, T.E., and Tracy, R.P.: Variability in the measurement of C-reactive protein in healthy subjects: implications for reference interval and epidemiological applications. Clin Chem, 43;1:52-58, 1997. Hedlund, P.: Clinical and experimental studies on C-reactive protein (acute phase protein). Thesis Acta Med Scand, 128 (Suppl, 361):1-71, 1961. Hedlund, P.: The appearance of acute phase protein in various diseases. Acta Med Scand, 128, (Suppl,196): 579-601, 1947. Morley, J.J., Kushner, I.: Serum C-reactive Protein Levels. in: Kushner, I., Volanakis, J.E., and Gerwutz, H., eds., C-Reactive Protein and the Plasma Protein Response to Tissue Injury. Annals of N.Y. Acad Sci, 389: 406-417, 1982. |
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