Tests for the detection of the Coronavirus COVID 19
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Types of test
This is the reference technique for diagnosing the SARS-CoV-2 virus in the early stages of the disease since it is a very sensitive system, able to detect very low amounts of virus. However, it does not in itself differentiate the stage of the disease the patient may be in: onset, acute phase, or recovery phase. If a negative result is obtained from a patient with high suspicion of SARS-CoV-2 virus infection, it should be confirmed with a new test.
Sampling is performed via the nasopharyngeal route and thus is not necessary to attend on an empty stomach.
Detection of IgM and IgG type antibodies against COVID-2019 (SARS-CoV-2) using the reference test (ELISA / Chemiluminescence): Quantitative immunoassay and CE marked.
- IgM-type antibodies are markers of recent infection and are detected in 90% of cases between days 4 to 7 of infection, continue to increase until day 14, and then begin to decrease.
- LIgM-type antibodies are markers of recent infection and are detected in 90% of cases between days 4 to 7 of infection, continue to increase until day 14, and then begin to decrease.
IgG-type antibodies are detected somewhat later (on average on day 8 post infection), and increase until 3weeks, approximately. The sensitivity and specificity of the serological test we perform is close to 100%. It should be mentioned that the detection test for IgM and IgG antibodies against COVID-19 by immunoassay is NOT the fast test for antibody detection.
Sampling is performed via conventional blood withdrawal and it is not necessary to attend on an empty stomach
These enable us to attain the patient's antibodies through them binding to the virus proteins deposited on a medium, producing visible colouration that is usually produced by colloidal gold. This range is therefore associated with the presence of specific antibodies and some tests (but not all) make it possible to distinguish whether they are IgM or IgG. They only detect the virus antigens and not others associated with other infections or pathologies. The test takes about 15-20 minutes.
Sampling is performed via a drop of blood and it is not necessary to attend on an empty stomach.