• Product name

    Human Complement C4a des Arg ELISA Kit
  • Detection method

  • Precision

    Sample n Mean SD CV%
    C4a des Arg 14 2.2ng/ml 13.9%
    C4a des Arg 14 5ng/ml 10.5%
    C4a des Arg 14 10.8ng/ml 6.7%
    Sample n Mean SD CV%
    C4a des Arg 6 5.13ng/ml 12.5%
    C4a des Arg 6 10.1ng/ml 11.3%
  • Sample type

  • Assay type

  • Sensitivity

    0.76 ng/ml
  • Range

    0.78 ng/ml - 200 ng/ml
  • Assay time

    2h 45m
  • Assay duration

    Multiple steps standard assay
  • Species reactivity

    Reacts with: Human
  • Product overview

    Abcam’s Human Complement C4a des Arg in vitro competitive ELISA (Enzyme-Linked Immunosorbent Assay) kit is designed for the accurate quantitative measurement of Complement C4a des Arg in Human plasma samples.

    A goat anti-rabbit IgG antibody has been precoated onto 96-well plates. Standards or test samples are added to the wells, along with an alkaline phosphatase (AP) conjugated-Complement Complement C4a des Arg antigen and a polyclonal antibody specific to Complement C4a des Arg. After incubation the excess reagents are washed away and pNpp substrate is added, which causes generation of yellow color. The intensity of the yellow coloration is inversely proportional to the amount of Complement C4a des Arg captured in the plate.

  • Notes

    Compound                                                                    Cross reactivity

    Human Complement C4a des Arg


    Human Complement C4

    Human Complement C5 des Arg          0.28%
    Human Complement C3          0.23%

    Human Complement C3a des Arg

    Human Complement C5          0.02%
  • Tested applications

    Suitable for: Competitive ELISAmore details
  • Platform



  • Storage instructions

    Please refer to protocols.
  • Components 1 x 96 tests
    20X Wash Buffer Concentrate 1 x 30ml
    Assay Buffer 10 Concentrate 1 x 15ml
    Complement Reagent A 1 x 15ml
    Complement Reagent B 1 x 30ml
    Goat anti-rabbit IgG Microplate (12 x 8 wells) 1 unit
    Human C4a des Arg Alkaline Phosphatase Conjugate 1 x 6ml
    Human Complement C4a des Arg Antibody 1 x 6ml
    Human Complement C4a des Arg Standard 1 x 500µl
    Plate Sealer 2 units
    pNpp Substrate 1 x 20ml
    Stop Solution 1 x 6ml
  • Research areas

  • Function

    C4 plays a central role in the activation of the classical pathway of the complement system. It is processed by activated C1 which removes from the alpha chain the C4a anaphylatoxin. The remaining alpha chain fragment C4b is the major activation product and is an essential subunit of the C3 convertase (C4b2a) and the C5 convertase (C3bC4b2a) enzymes of the classical complement pathway.
    Derived from proteolytic degradation of complement C4, C4a anaphylatoxin is a mediator of local inflammatory process. It induces the contraction of smooth muscle, increases vascular permeability and causes histamine release from mast cells and basophilic leukocytes.
  • Involvement in disease

    Defects in C4A are the cause of complement component 4A deficiency (C4AD) [MIM:614380]. A rare defect of the complement classical pathway associated with the development of autoimmune disorders, mainly systemic lupus with or without associated glomerulonephritis.
    Defects in C4A are a cause of susceptibility to systemic lupus erythematosus (SLE) [MIM:152700]. A chronic, inflammatory and often febrile multisystemic disorder of connective tissue. It affects principally the skin, joints, kidneys and serosal membranes. It is thought to represent a failure of the regulatory mechanisms of the autoimmune system. Note=Interindividual copy-number variation (CNV) of complement component C4 and associated polymorphisms result in different susceptibilities to SLE. The risk of SLE susceptibility has been shown to be significantly increased among subjects with only two copies of total C4. A high copy number is a protective factor against SLE.
  • Sequence similarities

    Contains 1 anaphylatoxin-like domain.
    Contains 1 NTR domain.
  • Post-translational

    Prior to secretion, the single-chain precursor is enzymatically cleaved to yield the non-identical chains (alpha, beta and gamma). During activation, the alpha chain is cleaved by C1 into C4a and C4b, and C4b stays linked to the beta and gamma chains. Further degradation of C4b by C1 into the inactive fragments C4c and C4d blocks the generation of C3 convertase.
    N- and O-glycosylated. O-glycosylated with a core 1 or possibly core 8 glycan.
  • Cellular localization

  • Information by UniProt
  • Alternative names

    • acidic C4
    • Acidic complement C4
    • C3 and PZP-like alpha-2-macroglobulin domain-containing protein 2
    • C4
    • C4A
    • C4A anaphylatoxin
    • C4A2
    • C4A3
    • C4A4
    • C4A6
    • C4AD
    • C4S
    • CO4
    • CO4A_HUMAN
    • complement C4 A
    • Complement C4 gamma chain
    • complement component 4A (Rodgers blood group)
    • CPAMD2
    • RG
    • Rodgers form of C4
    see all
  • Database links


Our Abpromise guarantee covers the use of ab136937 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
Competitive ELISA Use at an assay dependent concentration.


  • Representative standard curve using ab136937.



ab136937 has not yet been referenced specifically in any publications.

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