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QuicKey Human PCT(Procalcitonin) ELISA Kit

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Price:   $390
Cat Number:  E-TSEL-H0002
Lead Time:   7~10 days

Reactivity:  Human

Detection Range:  0.31~20 ng/mL

Sensitivity:  0.08 ng/mL

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Product Details

QuicKey Series

Get more sensitive and precise results with saving at least 1h comparing to traditional ELISA Kits. The new developed technology in house will help to accelerate your science research in a more efficient way.


Assay type Sandwich-ELISA
Format 96T/48T
Assay time 2.5 h
Reactivity Human
Detection method Colormetric
Colormetric 0.31-20 ng/mL
Sensitivity 0.08 ng/mL
Sample volume 50μL/well
Sample type serum, plasma, urine
Specificity This kit recognizes Human PCT in samples. No significant cross-reactivity or interference between Human PCT and analogues was observed.
Reproducibility Both intra-CV and inter-CV are < 10%.
Application This ELISA kit applies to the in vitro quantitative determination of Human PCT concentrations in serum, plasma, urine. Please consult technical support for the applicability if other biological fluids need to be tested.

Test principle

This ELISA kit uses the Sandwich-ELISA principle. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Human PCT. Samples (or Standards) and biotinylated detection antibody specific for Human PCT are added to the micro ELISA plate wells. Human PCT would combine with the specific antibody. Then Avidin-Horseradish Peroxidase (HRP) conjugate are added successively to each micro plate well and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Human PCT, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by the addition of stop solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 ± 2 nm. The OD value is proportional to the concentration of Human PCT. You can calculate the concentration of Human PCT in the samples by comparing the OD of the samples to the standard curve.

Kit components & Storage

An unopened kit can be stored at 2-8℃ for six months. After test, the unused wells and reagents should be stored according to the table below. (The specific components might be slightly different in delivered kits, please refer to the manual for more information.)

Item Specifications Storage conditions after test
Micro ELISA Plate (Dismountable) 96T: 8 wells ×12 strips
48T: 8 wells ×6 strips
2-8℃, 1 month
Reference Standard 96T: 2 vials
48T: 1 vial
Discard unused reconstituted standard and dilutions
Reference Standard & Sample Diluent 1 vial, 20 mL 2-8℃
Biotinylated Detection Ab Working Solution 1 vial, 6 mL
HRP Conjugate Diluent 1 vial, 14 mL
Concentrated Wash Buffer (25×) 1 vial, 30 mL
Concentrated HRP Conjugate (100×) 96T: 1 vial, 120 μL
48T: 1 vial, 60 μL
2-8℃ (Protect from light)
Substrate Reagent 1 vial, 10 mL
Stop Solution 1 vial, 10 mL 2-8℃
Plate Sealer 5 pieces
Product Description 1 copy
Certificate of Analysis 1 copy

Note: All reagent bottle caps must be tightened to prevent evaporation and microbial pollution. The volume of reagents in partial shipments is a little more than the volume marked on the label, please use accurate measuring equipment instead of directly pouring into the vial(s).

Other supplies required

1. Microplate reader with 450nm wavelength filter

2. High-precision transfer pipette, EP tubes and disposable pipette tips

3. Incubator capable of maintaining 37℃

4. Deionized or distilled water

5. Absorbent paper

6. Loading slot for Wash Buffer

Technical Data

Sample values


Typical Standard Curve

As the OD values of the standard curve may vary according to the conditions of the actual assay performance (e.g. operator, pipetting technique, washing technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data is provided below for reference only.

Concentration(ng/mL) 20 10 5 2.5 1.25 0.63 0.31 0
OD 2.497 1.665 0.968 0.467 0.267 0.177 0.121 0.062
Corrected OD 2.435 1.603 0.906 0.405 0.205 0.115 0.059 -


Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human PCT were tested 20 times on one plate, respectively.

Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human PCT were tested on 3 different plates, 20 replicates in each plate.

Intra-assay Precision Inter-assay Precision
Sample 1 2 3 1 2 3
n 20 20 20 20 20 20
Mean(ng/mL) 0.99 2.49 9.15 0.97 2.47 8.00
Standard deviation 0.06 0.12 0.40 0.06 0.12 0.39
CV (%) 6.06 4.82 4.37 6.19 4.86 4.88


The recovery of Human PCT spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

Sample Type Range (%) Average Recovery (%)
Serum(n=8) 95-102 99
EDTA plasma(n=8) 86-99 93
Urine(n=8) 87-98 90


Samples were spiked with high concentrations of Human PCT and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.

Serum(n=4) EDTA plasma (n=4) Urine(n=4)
1:2 Range (%) 96-109 94-103 93-106
Average (%) 103 98 99
1:4 Range (%) 89-105 92-104 89-98
Average (%) 97 100 92
1:8 Range (%) 88-98 90-98 84-98
Average (%) 94 94 92
1:16 Range (%) 92-108 99-107 100-108
Average (%) 100 104 103

Target information


Procalcitonin (PCT), the precursor of the hormone calcitonin, comprises 116 amino acids and is present in minute quantities under healthy conditions[1]. PCT and other calcitonin precursors in serum are present at less than 50 pg/mL in healthy individuals, but are highly elevated in serum where conditions leading to systemic inflammatory response syndrome or sepsis prevail. The level of PCT has been observed to increase significantly with bacterial infection and correlate to the severity of the infection. Therefore, serum PCT has been considered a powerful biomarker for the diagnosis of bacterial infection[2]. PCT has been proven to have high accuracy as a marker of infection in adult patients, particularly in sepsis. In children it has been investigated in several conditions, including neonatal sepsis, severe infection in neutropenic children, and other specific bacterial infections (e.g. urinary tract infections, pneumonia, bone and joint tissue infections).
1. Christ-Carin M. Procalcitonin in bacterial infections-hype, hope, more or less?[J]. Swiss medical weekly, 2005, 135(3132).
2. Brechot N, Hekimian G, Chastre J, et al. Procalcitonin to guide antibiotic therapy in the ICU[J]. International journal of antimicrobial agents, 2015, 46: S19-S24.

Research area

Database Links

SwissProt P01258 Human
Entrez Gene 796 Human





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Assay procedures

1. Add 50μL standard or sample to the wells, immediately add 50μL Biotinylated Detection Ab working solution to each well. Incubate for 90 min at 37°C
2. Aspirate and wash the plate for 3 times
3. Add 100μL HRP conjugate working solution. Incubate for 30 min at 37°C. Aspirate and wash the plate for 5 times
4. Add 90μL Substrate Reagent. Incubate for 15 min at 37°C
5. Add 50μL Stop Solution
6. Read the plate at 450nm immediately. Calculation of the results
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