IN an ELISA test, specific components of the immune system like antibodies are used in conjunction with chemicals with the capacity to detect the body’s immune response. The test involves an enzyme which is defined as a “protein that brings about a biochemical reaction.”


Basic Overview Of ELISA

The test also involves an antibody or antigen which is defined as an “immunologic molecule” that might form an antigen/antibody reaction that would give a positive result. If these have no reaction, this would be a negative result. For an overview of ELISA go to

Infections that ELISA is responsible for diagnosing include:

  • HIV or human immunodeficiency virus
  • Food allergies or other allergic diseases

What Is ELISA Assay?

Enzyme-Linked Immunosorbent Assay (ELISA) also referred to as EIA or enzyme immunoassay is basically defined as a “biochemical method” used for different applications such as blood screening, microbiology, for antigen and antibody detection in a sample. The tool has become an important diagnostic technology for medical and plant pathology not to mention having used in the food industry for quality control.

The test relies on antibody traits to remedy the target antigen. The existence and amount of antigen get a mark through the detection system once identified.

What Is The Purpose Of An ELISA Test

Medical professionals incorporate the ELISA Assay test often for blood testing to find potential antigens in the blood. The test has the capacity to detect substances such as allergens, viral antigens, hormones, bacterial antigens like TB, and antibodies the body might develop due to an infection like hepatitis B or possibly due to vaccinations. These tests also have the ability to recognize an agent of infectious disease.

Types Of ELISA

There are three primary classifications for this test including Indirect, Sandwich, and Competitive.

  • Indirect Elisa: With this type, the sample protein is bound to the well via absorption. An antibody, referred to as an antigen, detects the proteins present in the sample. Numerous epitomes increase the sensitivity from the primary antibody that allows for signal amplification.
  • Bound to a well is a “capture” antibody. Following the sample addition, only proteins that the antibody identifies are captured. In the end, the bound protein detection carries out through the use of another antibody detection.

These capture/detection antibodies are also referred to as “matched antibody pair” or “matched pairs.” Finally, enzymes labeled as “secondary antibodies” detect the detection antibody.

  • Competitive Elisa: A primary antibody presence is produced with a sample outcome in a “complex.” Once this settles, the wells have a secondary antibody introduced. If the antigen isn’t bound to the primary antibody, it won’t be recognized. So, the antigen competes with the secondary.

The primary advantage of these tests is the overall accuracy and the capacity to give fast results. Plasma and serum samples are needed to do an ELISA so centrifugation of a sample is generally required. Because these are capable of testing antibodies and antigens, medical professionals find them to be flexible tools. View for details on the ELISA technology.

The technology boasts convenience for blood screens to detect infection markers, particularly for HIV. It’s mandatory in many countries to prevent tainted blood from being released and for assurance for safe blood units and components for transfusions.

Using the tests are beneficial for the food industry to detect allergens and with toxicology or screening of specific drug classes. The procedure touts ease of use with incredible sensitivity and high levels of specificity based on the reaction from antibody to antigen.

The ELISA technology is exceptionally efficient as there can be simultaneous analysis without complex pretreatment of the samples. These particular tests are environmentally friendly and relatively safe due to the avoidance of radioactive substance use or any major levels of organic solvents.

The technology is a cost-effective process because the method can easily be made into an automated procedure with nearly as many as 100 tests accomplished in merely one assay with few hands in the process. It has a preference as a biotechnical tool for many applications and is very useful for the clinical diagnoses of a vast array of conditions or diseases as well as scientific research as a whole.