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Human I-PTH(IntactParathormone) ELISA Kit
ELK2427
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48 T $320.00
96 T $458.00
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OverviewPublications

Product name: Human I-PTH(IntactParathormone) ELISA Kit
Reactivity: Human
Alternative Names: iPTH; Intact Parathyroid Hormone; Parathormone; Parathyrin; PTH; Parathyroid Hormone
Assay Type: Sandwich
Sensitivity: 4.95 pg/mL
Standard: 1000 pg/mL
Detection Range: 15.63-1000 pg/mL
Sample Type: serum, plasma and other biological fluids
Assay Length: 3.5h
Research Area: Metabolic pathway;Endocrinology;Hormone metabolism;
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 I-PTH. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human I-PTH. 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 I-PTH, 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 I-PTH 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
1000.00 1.989 1.900
500.00 1.633 1.544
250.00 1.121 1.032
125.00 0.726 0.637
62.50 0.529 0.440
31.25 0.322 0.233
15.63 0.252 0.163
0.00 0.089 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 I-PTH and the recovery rates were calculated by comparing the measured value to the expected amount of I-PTH in samples.
Matrix Recovery range Average
serum(n=5) 86-99% 92%
EDTA plasma(n=5) 80-95% 87%
Heparin plasma(n=5) 83-95% 89%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of I-PTH 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) 95-102% 87-101% 82-95% 81-93%
EDTA plasma(n=5) 85-92% 79-96% 95-102% 87-98%
Heparin plasma(n=5) 89-105% 81-94% 96-105% 92-103%