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Human CRP(C-Reactive Protein) ELISA Kit

  • Cat.No.:E-EL-H0043

  • Reactivity: Human

To Purchase E-EL-H0043

  • 96T
  • 48T
  • 24T
  • 96T*5
  • 96T*10
Price: $495

Product Details


Assay type Sandwich-ELISA
Format 96T/48T
Assay time 3.5h
Detection range 0.39-25 ng/mL
Sensitivity 0.23 ng/mL
Sample type &Sample volume serum, plasma and other biological fluids; 100μL
Specificity This kit recognizes Human CRP in samples. No significant cross-reactivity or interference between Human CRP 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 CRP concentrations in serum, plasma and other biological fluids.

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 CRP. Standards or samples are added to the micro ELISA plate wells and combined with the specific antibody. Then a biotinylated detection antibody specific for Human CRP and 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 CRP, 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 nm ± 2 nm. The OD value is proportional to the concentration of Human CRP. You can calculate the concentration of Human CRP 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 1 month. If the kit is not supposed to be used within 1 month, store the components separately according to the following conditions once the kit is received.
Micro ELISA Plate(Dismountable) 96T: 8 wells ×12 strips
48T: 8 wells ×6 strips
-20℃, 6 months
Reference Standard 96T: 2 vials
48T: 1 vial
Concentrated Biotinylated Detection Ab (100×) 96T: 1 vial, 120 μL
48T: 1 vial, 60 μL
Concentrated HRP Conjugate (100×) 96T: 1 vial, 120 μL
48T: 1 vial, 60 μL
-20℃(Protect from light), 6 months
Reference Standard & Sample Diluent 1 vial, 20 mL 2-8°C, 6 months
Biotinylated Detection Ab Diluent 1 vial, 14 mL
HRP Conjugate Diluent 1 vial, 14 mL
Concentrated Wash Buffer (25×) 1 vial, 30 mL
Substrate Reagent 1 vial, 10 mL 2-8℃(Protect from light)
Stop Solution 1 vial, 10 mL 2-8°C
Plate Sealer 5 pieces
Manual 1 copy
Certificate of Analysis 1 copy

Technical Data


Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human CRP were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human CRP 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) 2.50 4.90 16.80 2.50 4.70 18.20
Standard deviation 0.10 0.20 0.60 0.20 0.30 0.70
CV (%) 4.00 4.08 3.57 8.00 6.38 3.85


The recovery of Human CRP 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) 90-102 95
EDTA plasma (n=8) 85-97 90
Cell culture media (n=8) 88-103 94


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

Target Information

Database LinksSwissProt:   P02741
SynonymsPTX1, Pentraxin 1
Research AreaCancer, Cardiovascular, Epigenetics and Nuclear Signaling, Metabolism, Immunology

Assay Procedures

elisa assay procedure 1

1. Add 100μL standard or sample to the wells. Incubate for 90 min at 37°C

elisa assay procedure 2

2. Discard the liquid, immediately add 100μL Biotinylated Detection Ab working solution to each well. Incubate for 60 min at 37°C

elisa assay procedure 3

3. Aspirate and wash the plate for 3 times

elisa assay procedure 4

4. Add 100μL HRP conjugate working solution. Incubate for 30 min at 37°C. Aspirate and wash the plate for 5 times

elisa assay procedure 5

5. Add 90μL Substrate Reagent. Incubate for 15 min at 37°C

elisa assay procedure 6

6. Add 50μL Stop Solution

elisa assay procedure 7

7. Read the plate at 450nm immediately. Calculation of the results


From now on, if you have published a paper by using any of our products since 1/1/2019, fill out the “Elabscience Publication Reward Application Form”carefully and send it to, we will get back to you with the reward after we confirm it ASAP!

View more details about our Publication Reward >>

  1. Nutrients (2020) IF: 4.546
    Intermittent Fasting Enhanced the Cognitive Function in Older Adults with Mild Cognitive Impairment by Inducing Biochemical and Metabolic changes: A 3-Year Progressive Study

    DOI: 10.3390/nu12092644

    PMID: 32872655

    Sample: Plasma
  2. Scientific Reports (2021) IF: 3.998
    pNaKtide ameliorates renal interstitial fibrosis through inhibition of sodium-potassium adenosine triphosphatase-mediated signaling pathways in unilateral ureteral obstruction mice.

    DOI: 10.1038/s41598-021-87583-3

    Sample: Plasma
  3. Clinical and experimental rheumatology (2018) IF: 3.201
    Faecal but not serum calprotectin levels look promising in predicting active disease in Beh?et's syndrome patients with gastrointestinal involvement

    PMID: 30582504

    Sample: feces
  4. Biomedicine & Pharmacotherapy (2018) IF: 3.457
    Biochemical investigation of gender-specific association between insulin resistance and inflammatory biomarkers in types 2 diabetic patients.

    DOI: 10.1016/j.biopha.2018.06.044

    PMID: 29966972

    Sample: Serum
  5. IUBMB Life (2016) IF: 3.141
    TSG Attenuates LPC-Induced Endothelial Cells Inflammatory Damage Through Notch Signaling Inhibition.

    DOI: 10.1002/iub.1458

    PMID: 26662286

    Sample: Cell culture supernatant
  6. Autoimmunity (2020) IF: 2.125
    Auto-reactivity against gut bacterial peptides in patients with late-onset diabetes

    DOI: 10.1080/08916934.2020.1818232

    PMID: 32924613

    Sample: Serum
  7. Journal of Zhejiang University. Science. B (2020) IF: 2.082
    Clinical characteristics of 34 COVID-19 patients admitted to intensive care unit in Hangzhou, China

    DOI: 10.1631/jzus.B2000174

    PMID: 32425003

    Sample: Serum,Plasma
  8. Journal of Clinical Periodontology (2021) IF: 5.241
    Diabetes escalates knee osteoarthritis in rats: Evidence of adaptive mechanism.

    DOI: 10.1111/jcpe.13400

    Sample: Serum,Gingival Crevicular Fluid
  9. Plos One (2017) IF: 2.806
    High Anti-Human Cytomegalovirus Antibody Levels Are Associated With The Progression Of Essential Hypertension And Target Organ Damage In Han Chinese Population.

    DOI: 10.1371/journal.pone.0181440

    PMID: 28837559

    Sample: Serum
  10. Journal of Clinical Neuroscience (2019) IF: 1.76
    Sex difference in IL-6 modulation of cognition among Chinese individuals with major depressive disorder

    DOI: 10.1016/j.jocn.2019.10.002

    PMID: 31629608

    Sample: Serum
  11. Scientific Reports (2021) IF: 3.998
    Obesity?related proteins score as a potential marker of breast cancer risk

    DOI: 10.1038/s41598-021-87583-3

    Sample: Plasma
  12. Journal of Clinical Periodontology (2021) IF: 5.241
    Clinical, inflammatory and microbiological outcomes of full-mouth scaling with adjunctive glycine powder air-polishing: A randomized trial

    DOI: 10.1111/jcpe.13400

    Sample: Serum,Gingival Crevicular Fluid
  13. Kidney Diseases (2018) IF: /
    Prognostic Significance of Serum NGAL and Troponin I against Acute Kidney Injury in Egyptian ICU Patients after Open Heart Surgery: A Pilot Study.

    DOI: 10.1159/000490246

    PMID: 30574501

    Sample: Serum
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