Covid Antibody Test - ELISA
What is Covid 19?
This test is an immunological assay that detects antibodies produced by individuals, which occur in response to the exposure to the virus. ELISA is a microwell, plate-based assay technique that detects and quantifies substances such as proteins, antibodies, peptides, and hormones. ELISA technique is specifically designed for screening a large number of COVID samples at a time, which makes them suitable for surveillance purposes.
Why is Covid 19 done?
Current Covid-19 Positive Patients (within the first 21 days) SHOULD NOT get this test done. Covid-19 Positive Patients should ONLY get this test done after 21 days of being in quarantine / strict isolation. If you are having Influenza-like illness symptoms such as fever, sore throat, runny nose, cough, headaches, and fatigue then kindly do not go for this test.
This test is not meant for diagnosis but only for surveillance purposes. It would not indicate the present infection. It can only tell if a person has had a recent or prior COVID-19 infection.
What does Covid 19 Measure?
The ELISA test involves taking a sample of your blood. In this procedure, a phlebotomist will cleanse your arm with an antiseptic. Then, a band is tied around your arm to create pressure that causes your veins to swell with blood. Then, a needle is placed in one of your veins to draw a small sample of blood. This procedure is usually painless, but your arm may hurt a little after the procedure. In case the pain persists, apply a cold pack to the affected area. From the safety point of view of the patient, as well as phlebotomists, appropriate safety measures are taken during blood collection.
Interpreting Covid 19 results
What are the chances of false test results due to cross-reactivity?
Cross-reactivity of Anti COVID ECLIA/ELISA assays was studied with a comparison of COVID 19 infected results with non-coronavirus strain HKU1, NL63, 229E, or OC43 strains.
Following results (assay specificity & cross-reactivity) were obtained:
Sample set Count
How safe is this test?
Required measures such as masks and gloves are worn by the phlebotomist while taking the blood samples. Regular thermal scanning is also mandatory for the phlebotomist before going for sample collection. The samples are transported in triple-layer packaging.