info@stjohnslabs.com

+44 (0)208 223 3081

USD

Search

Compare
Login / Register
View Cart

Search

All
Primary antibodies
Secondary antibodies
Nanobodies
Kits
- Antibody Pairs
Proteins
Trial Size Antibodies
Blog
Company
- St John's Laboratory Guarantee
- Contact Us

USD
Compare
Login Register

Home
All
Kits
ELISA Kits
Competitive ELISA Kits

All

Refine by

No filters applied

Browse by Size, Reactivity & more Hide Filters Show Filters

Enter the minimum price to filter products by

Enter the maximum price to filter products by

Competitive ELISA Kits

This type of assay is used to measure the antigen concentration via signal interference detection.

Show

Show

Sort By:

Universal E2 (Estradiol) Competitive ELISA Kit (STJE0008545)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $531.99 - $721.05

Choose Options
Universal E2 (Estradiol) Ready-To-Use Competitive ELISA Kit (STJE0014923)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $552.69 - $752.79

Choose Options
Universal E3 (Estriol) Competitive ELISA Kit (STJE0008549)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal E3 (Estriol) Ready-To-Use Competitive ELISA Kit (STJE0014927)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal EE (Ethinylestradiol) Competitive ELISA Kit (STJE0008580)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $628.59 - $859.05

Choose Options
Universal EE (Ethinylestradiol) Ready-To-Use Competitive ELISA Kit (STJE0014958)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $654.81 - $897.69

Choose Options
Universal EPI (Epinephrine) Competitive ELISA Kit (STJE0008668)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal EPI (Epinephrine) Ready-To-Use Competitive ELISA Kit (STJE0015047)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal FMN (Flavin mononucleotide) Competitive ELISA Kit (STJE0019803)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $225.63 - $493.35

Choose Options
Universal GA (Gibberellic Acid) Competitive ELISA Kit (STJE0009024)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal GA (Gibberellic Acid) Ready-To-Use Competitive ELISA Kit (STJE0015404)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal gABA (Gamma-Aminobutyric Acid) Competitive ELISA Kit (STJE0009026)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $623.07 - $850.77

Choose Options
Universal gABA (Gamma-Aminobutyric Acid) Ready-To-Use Competitive ELISA Kit (STJE0015406)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $649.29 - $889.41

Choose Options
Universal GC (Glucocorticoid) Competitive ELISA Kit (STJE0009207)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal GC (Glucocorticoid) Ready-To-Use Competitive ELISA Kit (STJE0015587)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal GSH (Glutathione) Competitive ELISA Kit (STJE0009326)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal GSH (Glutathione) Ready-To-Use Competitive ELISA Kit (STJE0015707)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HA (Hyaluronic Acid) Competitive ELISA Kit (STJE0009380)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HA (Hyaluronic Acid) Ready-To-Use Competitive ELISA Kit (STJE0015761)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HCy (Homocysteine) Competitive ELISA Kit (STJE0009410)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HCy (Homocysteine) Ready-To-Use Competitive ELISA Kit (STJE0015792)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HIS (Histamine) Competitive ELISA Kit (STJE0009462)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HIS (Histamine) Ready-To-Use Competitive ELISA Kit (STJE0015844)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HVA (Homovanillic Acid) Competitive ELISA Kit (STJE0009610)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HVA (Homovanillic Acid) Ready-To-Use Competitive ELISA Kit (STJE0015992)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HVD3 (25-Hydroxyvitamin D3) Competitive ELISA Kit (STJE0009612)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HVD3 (25-Hydroxyvitamin D3) Ready-To-Use Competitive ELISA Kit (STJE0015994)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal Hyp (Hydroxyproline) Competitive ELISA Kit (STJE0009617)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal Hyp (Hydroxyproline) Ready-To-Use Competitive ELISA Kit (STJE0015999)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal IP3 (Inositol Triphosphate) Competitive ELISA Kit (STJE0010039)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $628.59 - $859.05

Choose Options
Universal IP3 (Inositol Triphosphate) Ready-To-Use Competitive ELISA Kit (STJE0016424)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $654.81 - $897.69

Choose Options
Universal LPS (Lipopolysaccharides) Competitive ELISA Kit (STJE0010410)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal LPS (Lipopolysaccharides) Ready-To-Use Competitive ELISA Kit (STJE0016797)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $629.97 - $860.43

Choose Options
Universal LTB4 (Leukotriene B4) Competitive ELISA Kit (STJE0010438)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal LTB4 (Leukotriene B4) Ready-To-Use Competitive ELISA Kit (STJE0016825)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal LXA4 (Lipoxin A4) Competitive ELISA Kit (STJE0010449)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal LXA4 (Lipoxin A4) Ready-To-Use Competitive ELISA Kit (STJE0016836)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal MT (Melatonin) Competitive ELISA Kit (STJE0010750)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal MT (Melatonin) Ready-To-Use Competitive ELISA Kit (STJE0017136)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal NAADP (Nicotinic Acid Adenine Dinucleotide Phosphate) Competitive ELISA Kit (STJE0010860)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $628.59 - $859.05

Choose Options
Universal NAADP (Nicotinic Acid Adenine Dinucleotide Phosphate) Ready-To-Use Competitive ELISA Kit (STJE0017246)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $654.81 - $897.69

Choose Options
Universal NE (Noradrenaline) Competitive ELISA Kit (STJE0010905)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal NE (Noradrenaline) Ready-To-Use Competitive ELISA Kit (STJE0017291)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal NT (Nitrotyrosine) Competitive ELISA Kit (STJE0011103)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal NT (Nitrotyrosine) Ready-To-Use Competitive ELISA Kit (STJE0017490)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal OHb (Beta Hydroxybutyric Acid) Competitive ELISA Kit (STJE0011183)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal OHb (Beta Hydroxybutyric Acid) Ready-To-Use Competitive ELISA Kit (STJE0017570)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal OT (Oxytocin) Competitive ELISA Kit (STJE0011220)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options

Universal E2 (Estradiol) Competitive ELISA Kit (STJE0008545)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $531.99 - $721.05

Choose Options
Universal E2 (Estradiol) Ready-To-Use Competitive ELISA Kit (STJE0014923)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $552.69 - $752.79

Choose Options
Universal E3 (Estriol) Competitive ELISA Kit (STJE0008549)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal E3 (Estriol) Ready-To-Use Competitive ELISA Kit (STJE0014927)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal EE (Ethinylestradiol) Competitive ELISA Kit (STJE0008580)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $628.59 - $859.05

Choose Options
Universal EE (Ethinylestradiol) Ready-To-Use Competitive ELISA Kit (STJE0014958)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $654.81 - $897.69

Choose Options
Universal EPI (Epinephrine) Competitive ELISA Kit (STJE0008668)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal EPI (Epinephrine) Ready-To-Use Competitive ELISA Kit (STJE0015047)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal FMN (Flavin mononucleotide) Competitive ELISA Kit (STJE0019803)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $225.63 - $493.35

Choose Options
Universal GA (Gibberellic Acid) Competitive ELISA Kit (STJE0009024)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal GA (Gibberellic Acid) Ready-To-Use Competitive ELISA Kit (STJE0015404)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal gABA (Gamma-Aminobutyric Acid) Competitive ELISA Kit (STJE0009026)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $623.07 - $850.77

Choose Options
Universal gABA (Gamma-Aminobutyric Acid) Ready-To-Use Competitive ELISA Kit (STJE0015406)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $649.29 - $889.41

Choose Options
Universal GC (Glucocorticoid) Competitive ELISA Kit (STJE0009207)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal GC (Glucocorticoid) Ready-To-Use Competitive ELISA Kit (STJE0015587)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal GSH (Glutathione) Competitive ELISA Kit (STJE0009326)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal GSH (Glutathione) Ready-To-Use Competitive ELISA Kit (STJE0015707)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HA (Hyaluronic Acid) Competitive ELISA Kit (STJE0009380)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HA (Hyaluronic Acid) Ready-To-Use Competitive ELISA Kit (STJE0015761)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HCy (Homocysteine) Competitive ELISA Kit (STJE0009410)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HCy (Homocysteine) Ready-To-Use Competitive ELISA Kit (STJE0015792)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HIS (Histamine) Competitive ELISA Kit (STJE0009462)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HIS (Histamine) Ready-To-Use Competitive ELISA Kit (STJE0015844)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HVA (Homovanillic Acid) Competitive ELISA Kit (STJE0009610)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HVA (Homovanillic Acid) Ready-To-Use Competitive ELISA Kit (STJE0015992)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal HVD3 (25-Hydroxyvitamin D3) Competitive ELISA Kit (STJE0009612)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal HVD3 (25-Hydroxyvitamin D3) Ready-To-Use Competitive ELISA Kit (STJE0015994)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal Hyp (Hydroxyproline) Competitive ELISA Kit (STJE0009617)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal Hyp (Hydroxyproline) Ready-To-Use Competitive ELISA Kit (STJE0015999)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal IP3 (Inositol Triphosphate) Competitive ELISA Kit (STJE0010039)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $628.59 - $859.05

Choose Options
Universal IP3 (Inositol Triphosphate) Ready-To-Use Competitive ELISA Kit (STJE0016424)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $654.81 - $897.69

Choose Options
Universal LPS (Lipopolysaccharides) Competitive ELISA Kit (STJE0010410)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal LPS (Lipopolysaccharides) Ready-To-Use Competitive ELISA Kit (STJE0016797)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $629.97 - $860.43

Choose Options
Universal LTB4 (Leukotriene B4) Competitive ELISA Kit (STJE0010438)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal LTB4 (Leukotriene B4) Ready-To-Use Competitive ELISA Kit (STJE0016825)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal LXA4 (Lipoxin A4) Competitive ELISA Kit (STJE0010449)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal LXA4 (Lipoxin A4) Ready-To-Use Competitive ELISA Kit (STJE0016836)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal MT (Melatonin) Competitive ELISA Kit (STJE0010750)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal MT (Melatonin) Ready-To-Use Competitive ELISA Kit (STJE0017136)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal NAADP (Nicotinic Acid Adenine Dinucleotide Phosphate) Competitive ELISA Kit (STJE0010860)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $628.59 - $859.05

Choose Options
Universal NAADP (Nicotinic Acid Adenine Dinucleotide Phosphate) Ready-To-Use Competitive ELISA Kit (STJE0017246)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $654.81 - $897.69

Choose Options
Universal NE (Noradrenaline) Competitive ELISA Kit (STJE0010905)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal NE (Noradrenaline) Ready-To-Use Competitive ELISA Kit (STJE0017291)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal NT (Nitrotyrosine) Competitive ELISA Kit (STJE0011103)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal NT (Nitrotyrosine) Ready-To-Use Competitive ELISA Kit (STJE0017490)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal OHb (Beta Hydroxybutyric Acid) Competitive ELISA Kit (STJE0011183)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $580.29 - $788.67

Choose Options
Universal OHb (Beta Hydroxybutyric Acid) Ready-To-Use Competitive ELISA Kit (STJE0017570)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options
Universal OT (Oxytocin) Competitive ELISA Kit (STJE0011220)

Applications :

ELISA

Reactivity :

Universal

MSRP:

Was:

Now: $603.75 - $824.55

Choose Options

576 of 630 Items

7
8
9
10
11
12
13
14

!

Footer Start

Information

about us
distributors
privacy policy
terms & conditions
blog

Customer service

contact us
shipping
FAQ
antibody troubleshooting

My Account

my account
order history

Company

St John's Laboratory Ltd
Knowledge Dock Business Centre
University Way
London
E16 2RD, UK

Subscribe

newsletter.subscribe_intro

Email Address

Receive discounts, product insights and technical resources as a subscriber.

© 2026 Product Ecommerce St John's Laboratory Ltd All Rights Reserved.

Terms
Privacy
Cookies