The purpose of COVID-19 vaccine shot is to develop the neutralizing antibodies that can prevent COVID-19 viral infection from reaching the human cells. 

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The purpose of Antibody test is to screen and measure the level of the neutralizing antibodies detected in the blood. 

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We conduct sVNT test that can be used for both qualitative and semi-quantitative detection of SARS-CoV-2 neutralizing antibodies. 

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The blood samples for antibody testing are not collected in Santa Clara office but visiting patient's location or designated location.