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Human Cys-C(Cystatin C) ELISA Kit
ELK11040
Size： Price：
48 T $265.00
96 T $376.00
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Overview

Product name: Human Cys-C(Cystatin C) ELISA Kit
Reactivity: Human
Alternative Names: CST3; Cystatin 3; ARMD11; Post-Gamma-Globulin; Gamma Trace; Post-Gamma-Globulin; Neuroendocrine Basic Polypeptide; Amyloid Angiopathy And Cerebral Hemorrhage
Assay Type: Sandwich
Sensitivity: 2.47 ng/mL
Standard: 200 ng/mL
Detection Range: 3.13-200 ng/mL
Sample Type: Serum, plasma, tissue homogenates, cell lysates, cell culture supernates and other biological fluids.
Assay Length: 3.5h
Research Area: Kidney biomarker;Urology;
Test principle: The test principle applied in this kit is Sandwich enzyme immunoassay. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Human Cys-C. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human Cys-C. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Human Cys-C, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of Human Cys-C in the samples is then determined by comparing the OD of the samples to the standard curve.

Standard curve

Concentration (ng/mL) OD Corrected OD
200.00 2.218 2.112
100.00 1.964 1.858
50.00 1.528 1.422
25.00 0.899 0.793
12.50 0.577 0.471
6.25 0.351 0.245
3.13 0.264 0.158
0.00 0.106 0.000

Precision

Intra-assay Precision (Precision within an assay)：CV%<8%

Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision.

Inter-assay Precision (Precision between assays)：CV%<10%

Three samples of known concentration were tested in forty separate assays to assess inter-assay precision.

Recovery

Matrices listed below were spiked with certain level of recombinant Cys-C and the recovery rates were calculated by comparing the measured value to the expected amount of Cys-C in samples.
Matrix Recovery range Average
serum(n=5) 79-91% 85%
EDTA plasma(n=5) 81-97% 89%
Heparin plasma(n=5) 84-99% 91%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Cys-C and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
Matrix 1:2 1:4 1:8 1:16
serum(n=5) 85-92% 88-96% 87-98% 95-102%
EDTA plasma(n=5) 98-105% 96-103% 87-95% 83-92%
Heparin plasma(n=5) 95-104% 87-96% 89-101% 97-105%