ELISA Kits

Competitive ELISA Kits

Single-antibody signal interference detection for small molecules, hormones and metabolites.

Our competitive ELISA kits cover small molecules, hormones and metabolites, including targets such as cortisol, cAMP, 8-OHdG, 3-NT and angiotensin II. Kits are available across a range of species and pack sizes, with a downloadable datasheet and safety data sheet supplied for every kit.

How it works

Signal interference detection

Each competitive ELISA kit measures antigen concentration via signal interference detection.1 Free antigen from the sample competes with a fixed amount of labelled antigen for a limited number of antibody binding sites, so the measured signal falls as the concentration of antigen in the sample rises. This single-antibody format suits small molecules such as hormones and metabolites that are too small to be bound by two antibodies at once, which is why the range is built around targets in this size class rather than larger proteins.

Category benefits

Why use our competitive ELISA kits?

✓ Broad small-molecule and hormone coverage
The range spans hormones, prostaglandins, oxidative stress markers and metabolites, from steroid hormones such as cortisol and estradiol to markers like 8-OHdG, 3-NT and 4-HNE.
✓ Standard and Ready-to-use options
Many targets in the range are available as a standard competitive kit or as a Ready-to-use kit, so you can choose the format that fits your workflow.
✓ Wide species reactivity
Reactivity spans species including bovine, canine, equine, chicken and guinea pig, alongside a large set of kits with reactivity to all species.
✓ Datasheet and SDS with every kit
Each kit has its own downloadable datasheet and safety data sheet, so you can check the specifics before you order.
Where they're used

Typical applications

✓ Endocrine and hormone research
Kits for steroid and peptide hormones such as cortisol, estradiol, progesterone and parathyroid hormone support endocrine study designs.
✓ Oxidative stress and metabolite research
Markers including 8-OHdG, 3-NT, 4-HNE and ADMA let you build out oxidative stress and metabolic marker panels within one kit range.
✓ Neuropeptide and signalling molecule studies
Targets such as neuropeptide Y, orexin A, vasoactive intestinal peptide and cAMP support work on neuroendocrine and cell signalling pathways.
✓ Scaling from pilot study to full plate
24 T, 48 T and 96 T sizes let you scale a study from a small pilot run up to a full 96-well plate.
Related resources

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All ELISA Kits

See sandwich, Ready-to-use and matched antibody pair formats alongside our competitive kits.

View ELISA kits 		Sandwich ELISA Kits

For larger antigens, our two-antibody sandwich kits offer a capture and detection antibody pair per target.

View sandwich ELISA kits

Need help choosing a competitive ELISA kit?

Our technical support team can help match a kit to your target, species and sample type. See individual datasheets for confirmed sensitivity, range and cross-reactivity data.

Looking for more competitive ELISA kits?

Browse the full range, filterable by target, species and size.

 Browse more ELISA kits

For Research Use Only. Not for use in diagnostic procedures.

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