COVID-19 Human IgG ELISA Kit

RayBio® COVID-19 N and S1 RBD protein Human Antibody Detection Kit (Indirect ELISA method) for the quantitative measurement of human IgG antibody against SARS-CoV-2 in serum. This Product is for Research Use Only. Not for use in in vitro diagnostics.

This Product is for Research Use Only, not for use in in vitro diagnostics, following guidance from the FDA for tests submitted to the FDA for Emergency Use Authorization and Notification on March 16th, 2020, and amended on May 4th, 2020. While this test has been submitted for FDA EUA Authorization, it currently has not been reviewed by the FDA and results from antibody testing should not be used as the sole basis to diagnose or exclude SARS-CoV-2 infection or to inform infection status. Please consult the manual for specific details and limitations of this test.

Assay Format

Number of Targets Detected:
Species Detected:
  • Human
Compatible Sample Types:
  • Dried Blood
  • Plasma
  • Saliva
  • Serum
Design Principle:
  • Indirect
Method of Detection:
  • Quantitative
Solid Support:
96-well Microplate

Product Specifications

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

Protein Information

Gene Symbols:
  • IGG

Application Notes

Kit Components
  • SARS-CoV-2 N-protein coated 96-well microplate
  • Wash Buffer
  • Positive Control
  • Biotinylated Anti-Human IgG
  • HRP-Streptavidin concentrate
  • TMB One-Step Substrate
  • Stop Solution
  • Assay Diluent
  • 5X Sample Diluent
  • 1X PBS (DBS version)
  • Tween-20 (DBS version)
  • Protease Inhibitor Cocktail (DBS version)
Other Materials Required
  • Microplate reader capable of measuring absorbance at 450 nm
  • Precision pipettes to deliver 2 µl to 1 ml volumes
  • Adjustable 1-25 ml pipettes for reagent preparation
  • 100 ml and 1 liter graduated cylinders
  • Tubes to prepare standard and sample dilutions
  • Absorbent paper
  • Distilled or deionized water
Protocol Outline
  1. Prepare all reagents, samples and standards as instructed.
  2. Add 100 µl positive control or sample to each well. Incubate 1 hour at room temperature.
  3. Add 100 μl prepared Biotinylated Anti-Human IgG Antibody into each well. Incubate 30 minutes at room temperature.
  4. Add 100 μl prepared HRP-Streptavidin solution to each well. Incubate 30 minutes at room temperature.
  5. Add 100 µl TMB One-Step Substrate Reagent to each well. Incubate 15 minutes at room temperature.
  6. Add 50 µl Stop Solution to each well. Read at 450 nm immediately.


The entire kit may be stored at -20°C for up to 1 year from the date of shipment. Avoid repeated freeze-thaw cycles. For extended storage, it is recommended to store at -80°C.
We tested three plasma samples from vaccinated individuals as well as 6 donors or unkown vaccination status. The assay worked beautifully and we were able to confirm whether the plasma samples had measurable levels of anti-Spike protein IgG. Easy to use kit and great results.

Massachusetts General Hospital
Great Kit. I used it to screen mice sera for IgG against CoV-2 Spike protein. I was advised to use anti-Mouse-IgG-Biotin instead of anti-Human-IgG-Biotin. It worked very well. Definitely I recommends this kit.

Esperovax Inc
Our laboratory was contracted to perform antibody testing for COVID19. We don't have the time or experience to develop an ELIZA method from scratch. By using and validating these kits. We were able to add a new service to our offerings within days. Using these kits, we were able to get repeatability and linearity between 3 different kits made on different days.

Parimer Scientific - Private Lab
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This product is furnished for LABORATORY RESEARCH USE ONLY.
Not for diagnostic or therapeutic use.