Beta-2 Glycoprotein I Screen ELISA Kit (Beta-2 GP1)


Human beta-2 glycoprotein 1 screen ELISA kit is designed to screen in vitro quantitative levels of IgM, IgA and IgG auto-antibodies to beta2-glycoprotein I screen (apolipoprotein H, beta-2 GP1, ApoH) in human serum and plasma samples. This assay has a minimum analytical sensitivity limit of 0.5 U/ml.


Beta-2 glycoprotein 1 also called beta-2 GP1, apolipoprotein H and ApoH is synthesised by; endothelial cells, trophoblast cells and hepatocytes. It is a 326 amino acid polypeptide which consists of 5 homologous domains that are each approx. 60 amino acids. In clinical research these antibodies can be identified using many different types of assays for example functional coagulation assays and immunoassays. These autoantibodies are present in patients which have antiphospholipid syndrome (APS). These antibodies are frequently discovered at elevated in patients that display systemic rheumatic diseases, in particular systemic lupus erythematosus. Whereas, plasma from normal individuals display relatively low levels of IgG autoantibodies.


All reagents supplied need to be stored at 2 °C – 8 °C, unopened reagents will retain reactivity until expiration date. Do not use reagents beyond this date.

  • Divisible Microplate: Consisting of 12 modules of 8 wells, highly purified beta-2 glycoprotein 1 is bound to microwells.
  • Calibrators A-D: Concentration 3.3-90 U/ml.
  • Sample Buffer P (5x).
  • Enzyme Conjugate: Contains anti-human IgG, IgA and IgM antibodies, HRP labelled.
  • TMB Substrate.
  • Stop Solution: Contains acid.
  • Wash Buffer (50x).
  • Instruction for Use.
  • Certificate of Analysis.


The minimum detection sensitivity level of human beta-2 GP1 screen (IgA, IgM or IgG) using current human beta-2 glycoprotein 1 ELISA kit was 0.5 U/ml. The dynamic range for this assay is 3.3 – 90.0 U/ml.


– Measuring Range: 0 – 90 U/ml.
– Expected Values: Samples from healthy blood donors display a cut-off 10 U/ml.
– Results Interpretation: Negative: < 10 U/ml, Positive: ≥ 10 U/ml.
– Linearity: 97 – 103%
– Limit Of Detection (LOD): Functional sensitivity 0.5 U/ml.
– Intra Assay: 3.9 – 9.1%
– Inter Assay: 2.5 – 5.2%
– Interfering Substances: None
– Clinical Diagnosis: Sensitivity (94.5%), Specificity (97.3%), Overall agreement (96.4%).


  1. β(2) -Glycoprotein I: evolution, structure and function. J Thromb Haemost. (2011) 9 (7): 1275-84. Review. de Groot P.G. and Meijers J.C.
  2. New tests to detect antiphospholipid antibodies: anti-domain I beta-2-glycoprotein-I antibodies. Curr Rheumatol Rep. (2014) 16 (2): 402. Review. Chighizola C.B., et al.
  3. Anticardiolipin and anti-beta-2-glycoprotein I antibodies. Autoimmunity. (2005) 38 (1): 33-8. Review. Marai I., et al.
  4. Anti-β2-glycoprotein I antibodies. Ann N Y Acad Sci. (2013) 1285: 44-58. Review. Willis R. and Pierangeli S.S.
  5. Laboratory methods to detect antiphospholipid antibodies. Hematology Am Soc Hematol Educ Program. (2014) 2014 (1): 321-8. Review. Krilis S.A. and Giannakopoulos B.


  • Full Name: Beta-2 Glycoprotein I Screen ELISA Kit (Beta-2 GP1)
  • Reactivity: Human
  • Sample Type: Plasma, Serum
  • Sensitivity: 0.5 U/ml


Online Enquiry Form

"*" indicates required fields

Please check mark information required:


Your secretory IgA ELISA gave good results and I was also really impressed with how quickly we received it.

L. Johnston
PhD Student / University of Glasgow

It is refreshing to know that you have a technical team that is very knowledgeable. I have already recommended your company to other researchers in our department.

Dr. P. Anderson
Lecturer / University College London (UCL)

I am a first time user and found that your instruction manual was very easy to follow. The insulin ELISA assay performed well and I was happy with the results that were generated.

J. Thomas
Senior Technician / Addenbrooke’s Hospital

I carried out a pilot study comparing the performance of many ELISA assay's from different suppliers and found your kits to be one of the better performers. We observed good linearity and tight replicates.

Dr. C. Davies
Lead Scientists / AstraZeneca

You are my first point of contact when I am looking to purchase ELISA. You have such an easy and simple system, yet it is very effective.

A. Shaw
Purchasing / University of Oxford