Rat IL18(Interleukin 18) ELISA Kit
Size: Price:
48 T $320.00
96 T $458.00


Product name: Rat IL18(Interleukin 18) ELISA Kit
Reactivity: Rat
Alternative Names: IL-18;IGIF; IL-1g; IL1F4; IL1-F4; Interferon-Gamma-Inducing Factor; Interleukin-1 Family Member 4; Iboctadekin; Interleukin-1 Gamma
Assay Type: Sandwich
Sensitivity: 41 pg/mL
Standard: 8000 pg/mL
Detection Range: 125-8000 pg/mL
Sample Type: serum, plasma, tissue homogenates, cell lysates, cell culture supernates and other biological fluids
Assay Length: 3.5h
Research Area: Cytokine;Infection immunity;
Uniprot ID: P97636
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 Rat IL18. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Rat IL18. 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 Rat IL18, 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 Rat IL18 in the samples is then determined by comparing the OD of the samples to the standard curve.

Standard curve

Concentration (pg/mL) OD Corrected OD
8000.00 2.204 2.100
4000.00 1.647 1.543
2000.00 1.073 0.969
1000.00 0.892 0.788
500.00 0.519 0.415
250.00 0.335 0.231
125.00 0.249 0.145
0.00 0.104 0.000


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.


Matrices listed below were spiked with certain level of recombinant IL18 and the recovery rates were calculated by comparing the measured value to the expected amount of IL18 in samples.
Matrix Recovery range Average
serum(n=5) 82-96% 87%
EDTA plasma(n=5) 86-97% 92%
Heparin plasma(n=5) 84-103% 96%


The linearity of the kit was assayed by testing samples spiked with appropriate concentration of IL18 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) 89-97% 86-102% 94-106% 85-97%
EDTA plasma(n=5) 96-101% 85-92% 79-96% 89-101%
Heparin plasma(n=5) 87-98% 92-104% 82-96% 95-102%