产品名称：氨基端前脑钠素(NT-ProBNP)检测试剂盒

This assay has high sensitivity and excellent specificity for detection of N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP). 
No significant cross-reactivity or interference between N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP) and analogues was observed.

Matrices listed below were spiked with certain level of recombinant N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP) and the recovery rates were calculated by comparing the measured value to the expected amount of N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP) in samples. 

Matrix	Recovery range (%)	Average(%)
serum(n=5)	93-102	98
EDTA plasma(n=5)	79-90	82
heparin plasma(n=5)	90-98	95

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP) were tested 20 times on one plate, respectively. 
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP) were tested on 3 different plates, 8 replicates in each plate. 
CV(%) = SD/meanX100 
Intra-Assay: CV<10% 
Inter-Assay: CV<12% 

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP) and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected. 

Sample	1:2	1:4	1:8	1:16
serum(n=5)	87-96%	98-105%	91-102%	91-105%
EDTA plasma(n=5)	80-104%	96-105%	98-105%	96-103%
heparin plasma(n=5)	83-96%	81-101%	80-101%	78-96%

The stability of kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage condition. 
To minimize extra influence on the performance, operation procedures and lab conditions, especially room temperature, air humidity, incubator temperature should be strictly controlled. It is also strongly suggested that the whole assay is performed by the same operator from the beginning to the end.

Reagents	Quantity	Reagents	Quantity
Pre-coated, ready to use 96-well strip plate	1	Plate sealer for 96 wells	4
Standard	2	Standard Diluent	1×20mL
Detection Reagent A	1×120µL	Assay Diluent A	1×12mL
Detection Reagent B	1×120µL	Assay Diluent B	1×12mL
TMB Substrate	1×9mL	Stop Solution	1×6mL
Wash Buffer (30 × concentrate)	1×20mL	Instruction manual	1

1. Prepare all reagents, samples and standards;
2. Add 100µL standard or sample to each well. Incubate 2 hours at 37^oC;
3. Aspirate and add 100µL prepared Detection Reagent A. Incubate 1 hour at 37^oC;
4. Aspirate and wash 3 times;
5. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37^oC;
6. Aspirate and wash 5 times;
7. Add 90µL Substrate Solution. Incubate 15-25 minutes at 37^oC;
8. Add 50µL Stop Solution. Read at 450nm immediately. 

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 N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP). Standards or samples are then added to the appropriate microtiter plate wells with a biotin-conjugated antibody specific to N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP). 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 N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP), 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 N-Terminal Pro-Brain Natriuretic Peptide (NT-ProBNP) in the samples is then determined by comparing the O.D. of the samples to the standard curve.