• Product name

    Human CD44 ELISA Kit
    See all CD44 kits
  • Detection method

  • Precision

    Sample n Mean SD CV%
    Sample A 8 9.85ng/ml 1.55 1.52%
    Sample B 8 10.5ng/ml 0.055 4.76%
    Sample n Mean SD CV%
    Sample A 50 9.95ng/ml 0.307 3.08%
    Sample B 50 1.07ng/ml 0.105 9.34%
  • Sample type

    Cell culture supernatant, Serum, Plasma
  • Assay type

    Sandwich (quantitative)
  • Sensitivity

    < 0.13 ng/ml
  • Range

    0.31 ng/ml - 10 ng/ml
  • Assay time

    2h 10m
  • Assay duration

    Multiple steps standard assay
  • Species reactivity

    Reacts with: Human
  • Product overview

    Abcam’s CD44 Human in vitro ELISA (Enzyme-Linked Immunosorbent Assay) kit is designed for the quantitative measurement of soluble CD44 in Human serum, plasma, buffered solutions and cell culture medium.

    A monoclonal antibody specific for CD44 has been coated onto the wells of the microtiter strips provided. Samples, including standards of known CD44 concentrations, control specimens or unknowns are pipetted into these wells. During the first incubation, the standards or samples and a biotinylated monoclonal antibody specific for CD44 are simultaneously incubated. After washing, the enzyme Streptavidin-HRP, that binds the biotinylated antibody is added, incubated and washed. A TMB substrate solution is added which acts on the bound enzyme to induce a colored reaction product. The intensity of this colored product is directly proportional to the concentration of CD44 present in the samples. 

    This kit will recognize both endogenous and recombinant Human CD44.

  • Tested applications

    Suitable for: Sandwich ELISAmore details
  • Platform



  • Storage instructions

    Store at +4°C. Please refer to protocols.
  • Components Identifier 1 x 96 tests 2 x 96 tests
    10X Standard Diluent Buffer Black 1 x 25ml 1 x 25ml
    200X Wash Buffer White 1 x 10ml 2 x 10ml
    Biotinylated Antibody Diluent Red 1 x 7ml 1 x 13ml
    Biotinylated anti-CD44 anitibody Red 1 x 0.3ml 2 x 0.3ml
    CD44 Control Silver 2 vials 4 vials
    CD44 Microplate (12 x 8 well strips) 1 unit 2 units
    CD44 Standard Yellow 2 vials 4 vials
    Chromogen TMB Substrate Solution 1 x 11ml 1 x 24ml
    HRP Diluent Red 1 x 23ml 1 x 23ml
    Plastic Plate Covers 2 units 4 units
    Stop Reagent Black 1 x 11ml 2 x 11ml
    Streptavidin-HRP 2 x 5µl 4 x 5µl
  • Research areas

  • Function

    Receptor for hyaluronic acid (HA). Mediates cell-cell and cell-matrix interactions through its affinity for HA, and possibly also through its affinity for other ligands such as osteopontin, collagens, and matrix metalloproteinases (MMPs). Adhesion with HA plays an important role in cell migration, tumor growth and progression. Also involved in lymphocyte activation, recirculation and homing, and in hematopoiesis. Altered expression or dysfunction causes numerous pathogenic phenotypes. Great protein heterogeneity due to numerous alternative splicing and post-translational modification events.
  • Tissue specificity

    Isoform 10 (epithelial isoform) is expressed by cells of epithelium and highly expressed by carcinomas. Expression is repressed in neuroblastoma cells.
  • Sequence similarities

    Contains 1 Link domain.
  • Domain

    The lectin-like LINK domain is responsible for hyaluronan binding.
  • Post-translational

    Proteolytically cleaved in the extracellular matrix by specific proteinases (possibly MMPs) in several cell lines and tumors.
    O-glycosylated; contains more-or-less-sulfated chondroitin sulfate glycans, whose number may affect the accessibility of specific proteinases to their cleavage site(s).
    Phosphorylated; activation of PKC results in the dephosphorylation of Ser-706 (constitutive phosphorylation site), and the phosphorylation of Ser-672.
  • Cellular localization

  • Information by UniProt
  • Alternative names

    • LHR
    • BA-1
    • CD 44
    • CD44
    • CD44 antigen
    • CD44 molecule
    • CD44 molecule (Indian blood group)
    • CD44_HUMAN
    • CDw44
    • CDW44 antigen
    • Cell surface glycoprotein CD44
    • chondroitin sulfate proteoglycan 8
    • CSPG8
    • ECMR-III
    • Epican
    • Extracellular matrix receptor III
    • GP90 lymphocyte homing/adhesion receptor
    • HCELL
    • hematopoietic cell E- and L-selectin ligand
    • Heparan sulfate proteoglycan
    • Hermes antigen
    • homing function and Indian blood group system
    • HSA
    • HUTCH-I
    • HUTCH1
    • HUTCHI
    • Hyaluronate receptor
    • IN
    • INLU-related p80 Glycoprotein
    • MC56
    • MDU2
    • MDU3
    • MGC10468
    • MIC4
    • MUTCH I
    • MUTCH1
    • PGP-1
    • PGP-I
    • PGP1
    • Phagocytic glycoprotein 1
    • Phagocytic glycoprotein I
    • Soluble CD44
    see all
  • Database links


Our Abpromise guarantee covers the use of ab45912 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
Sandwich ELISA Use at an assay dependent concentration.


  • huCD44 measured in biofluids showing quantity (ng) per mL of tested sample



This product has been referenced in:

  • Lau WM  et al. CD44v8-10 is a cancer-specific marker for gastric cancer stem cells. Cancer Res 74:2630-41 (2014). Read more (PubMed: 24618343) »
  • Simpson KL  et al. A caspase-3 'death-switch' in colorectal cancer cells for induced and synchronous tumor apoptosis in vitro and in vivo facilitates the development of minimally invasive cell death biomarkers. Cell Death Dis 4:e613 (2013). ELISA ; Human . Read more (PubMed: 23640455) »
See all 4 Publications for this product

Customer reviews and Q&As

1-6 of 6 Abreviews or Q&A


Thank you for your interest in the CD44 and CD56 ELISA kits, ab45912 and ab119587. Neither has been tested for reactivity with mouse or rat samples. We are unable to assess the probability of cross-reaction by BLAST, as the locations of the epitopes that the antibodies recognize are unknown. In general, without data showing otherwise, it is best to assume there will be some cross-reaction.

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Thank you for contacting Abcam regarding ab45912.

The wash buffer we recommend if you have run out is PBS with 0.05% Tween 20.

I hope this information is helpful. Please do not hesitate to contact us if you have any additional questions.

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Thank you for the question and for the customer to have taken the time to illustrate the question.

The laboratory confirmed thatboth antibodies will recognize the part after the cleavage site - the part which will be detached from the cells - please see here the comment from the laboratory for more details:

"The answer to the question is : the both antibodies recognize the protein AFTER the cleavage site.
I have explained with more detailed in the document added.
In a solution without cells, only the form soluble is detected because the both antibodies interacted in those soluble part. In a solution containingalso cells (culture for example), the soluble form is detected and also the membrane form could (we never have tested that but that is sure that as least one of those antibodies: x is able to recognizes the membrane form because it is also used in cytometry).
If the epitopes had been before the cleavage site, the ELISA on free cells solution would have given negative results"

I hope this answers the question of the customer. Please let me know if you have any additional questions or concerns.

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Thank you for your inquiry and your patience.

Unfortunately the antibody used as detection antibody has not been tested in any other application as IHC or ICC. We do therefore not know whether it can detect the CD44 on the cells.

The coated antibody is able to recognize the cell surface protein.

If the customer wants to perform Immunocytochemistry )ICC= of Flow cytometry, I would recommend to us another antibody and not the antibodies from the kit. I can recommend for example therefore the ab119863 , the FITC conjugated ab19622 or the ab51037. These antibodies have all been tested in ICC, IHC and flow cytometry.
https://www.abcam.com/index.html?datasheet=119863 (or use the following: https://www.abcam.com/index.html?datasheet=119863).
https://www.abcam.com/index.html?datasheet=19622 (or use the following: https://www.abcam.com/index.html?datasheet=19622).
https://www.abcam.com/index.html?datasheet=51037 (or use the following: https://www.abcam.com/index.html?datasheet=51037).

I am not sure whether I have understood the question correctly. Please do let me know if you need any more information.

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Thank you for your enquiry and your interest. This product has been specifically tested and it is suitable for cell culture supernatant, serum, plasma. We have not tested in other body fluids. For further information, please take a look at the online Protocol at this site: https://www.abcam.com/index.html?pageconfig=protocols&pid=565&intAbID=45912&strTab=protocols&mode=prot I hope this helps and if I can assist further, please do not hesitate to contact me.

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Thank you for your enquiry about ab45912. The constitutions of recommended lysis buffer is as follows; NaCl 150mM, NP-40 1%, Tris-HCl 20mM -adjust to pH=8 with protease inhibitors. I hope this information helps you, and please do not hesitate to contact us if you have further questions.

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