RayBio® Human IL-1 Ra (IL-1 F3) ELISA Kit for cell culture supernatants, plasma, serum, and lysate samples.

Lead time: Typically ships within 1-2 business days. No Friday shipments.


Assay Format

Detection Range:
0.1 ng/ml - 30 ng/ml
Recommended Dilution (serum & plasma):
2 fold
100 pg/ml

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This ELISA kit shows no cross-reactivity with any of the cytokines tested: Human Angiogenin, BDNF, BLC, ENA-78, FGF-4, IL-1 alpha, IL-1 beta, IL-2, IL-3, IL-4, IL-5, IL-7, IL-8, IL-9, IL-10, IL-11, IL-12 p70, IL-12 p40, IL-13, IL-15, I-309, IP-10, G-CSF, GM-CSF, IFN-gamma, Leptin, MCP-1, MCP-2, MCP-3, MDC, MIP-1 alpha, MIP-1 beta, MIP-1 delta, PARC, PDGF, RANTES, SCF, TARC, TGF-beta, TIMP-1, TIMP-2, TNF-alpha, TNF-beta, TPO, VEGF.
Number of Targets Detected:
Species Detected:
  • Human
Compatible Sample Types:
  • Cell Culture Supernatants
  • Cell Lysates
  • Plasma
  • Serum
  • Tissue Lysates
Design Principle:
  • Sandwich-based
Method of Detection:
  • Quantitative
Solid Support:
96-well Microplate

Product Specifications

1, 2, or 5 x 96-Well Strip Microplate Kit

Protein Information

Accession Number:
  • P18510
Gene ID:
  • 3557
Gene Symbols:
  • IL1F3
  • IL1RA
  • IL1RN
Protein Name & Synonyms:
Interleukin-1 receptor antagonist protein (IL-1RN) (IL-1ra) (IRAP) (ICIL-1RA) (IL1 inhibitor) (Anakinra)
Target Species:
  • Human

Product Features

Additional Notes
  • Strip plates and additional reagents allow for use in multiple experiments
  • Quantitative protein detection
  • Establishes normal range
  • The best products for confirmation of antibody array data

Standard Curves

Spiking & Recovery Results

Linearity Results

Application Notes

Kit Components
  • Pre-Coated 96-well Strip Microplate
  • Wash Buffer
  • Stop Solution
  • Assay Diluent(s)
  • Lyophilized Standard
  • Biotinylated Detection Antibody
  • Streptavidin-Conjugated HRP
  • TMB One-Step Substrate
Other Materials Required
  • Distilled or deionized water
  • Precision pipettes to deliver 2 µl to 1 µl volumes
  • Adjustable 1-25 µl pipettes for reagent preparation
  • 100 µl and 1 liter graduated cylinders
  • Tubes to prepare standard and sample dilutions
  • Absorbent paper
  • Microplate reader capable of measuring absorbance at 450nm
  • Log-log graph paper or computer and software for ELISA data analysis
Protocol Outline
  1. Prepare all reagents, samples and standards as instructed in the manual.
  2. Add 100 µl of standard or sample to each well.
  3. Incubate 2.5 h at RT or O/N at 4°C.
  4. Add 100 µl of prepared biotin antibody to each well.
  5. Incubate 1 h at RT.
  6. Add 100 µl of prepared Streptavidin solution to each well.
  7. Incubate 45 min at RT.
  8. Add 100 µl of TMB One-Step Substrate Reagent to each well.
  9. Incubate 30 min at RT.
  10. Add 50 µl of Stop Solution to each well.
  11. Read at 450 nm immediately.

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The entire kit may be stored at -20°C for up to 1 year from the date of shipment. Avoid repeated freeze-thaw cycles. The kit may be stored at 4°C for up to 6 months. For extended storage, it is recommended to store at -80°C.
  1. Langereis, Jeroen D., et al. "Steroids induce a disequilibrium of secreted interleukin-1 receptor antagonist and interleukin-1? synthesis by human neutrophils." European Respiratory Journal 37.2 (2011): 406-415.
    Species: Human
    Sample type: Plasma
  2. Langereis, Jeroen D., et al. "Steroids induce a disequilibrium of secreted interleukin-1 receptor antagonist and interleukin-1? synthesis by human neutrophils." European Respiratory Journal 37.2 (2011): 406-415.
    Species: Human
    Sample type: Conditioned Media (Neutrophils )
  3. Wang XS, Williams LA, Krishnan S, et al. Serum sTNFR1, IL6, and the Development of Fatigue in Patients with Gastrointestinal Cancer Undergoing Chemoradiation Therapy. Brain, Behavior, and Immunity. 2012;26(5):699-705. doi:10.1016/j.bbi.2011.12.007.
    Species: Human
    Sample type: Serum (Colorectal or esphageal cancer patients treated with concurrent chemoradiation therapy)
  4. Rocher C., Singla R., Singal P., et al. Bone morphogenetic protein 7 polarizes THP-1 cells into M2 macrophages. Can J Physiol Pharmacol. 2012 Jul;90(7):947-51. doi: 10.1139/y2012-102.
    Species: Human
    Sample type: Conditioned Media (THP-1 cells polarized to M2 macrophages treated with BMP7)
  5. Yen M., Donma O., Yildizfer F., et al. Association of fetuin A, adiponectin, interleukin 10 and total antioxidant capacity with IVF outcomes. Iran J Reprod Med Vol. 12. No. 11. pp: 747-754, November 2014
    Species: Human
    Sample type: Serum (IVF patients)
  6. Bartkevi?ien?, Daiva. "Bacterial vaginosis: risk factors and vaginal lavage cytokines IL-1b, IL-1ra." Sveikatos mokslai/Health Sciences 21.6 (78) (2011): 10-15.
    Species: Human
    Sample type: Conditioned Media (vaginal lavage samples)
  7. Panneer D., Antony P., Palamalai S., Negi V. Interleukin 1 receptor antagonist (IL1Ra) VNTR polymorphism influences circulatory IL1Ra levels and development of SLE in South Indian Tamils. Indian Journal of Rheumatology. Volume 11, Issue 1, March 2016, Pages 2-6
    Species: Human
    Sample type: Serum (Indian SLE Patients)

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This product is furnished for LABORATORY RESEARCH USE ONLY.
Not for diagnostic or therapeutic use.

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